Flights to Ontario (ONT): deals from 12 cities

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Flights for the months ahead

Lowest published fares for the months ahead: $165 round trip, Axel-exclusive, Frontier Airlines, nonstop, Dec 3–6, 2026; $115 one way, Axel-exclusive, Frontier Airlines, 1 stop, Jan 5, 2027; 144 priced flights on 72 exact dates, 1 adult, economy, checked Oct 29, 2026. Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

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Seattle (SEA) to Ontario (ONT): November 2026

Travel datesAirlineStopsTotal price
Nov 19, 2026 – Nov 22, 2026 · 3 nights · Compare return dates departing Nov 19, 2026Frontier AirlinesNonstopAxel-exclusive $193.88
Nov 19, 2026 – Nov 22, 2026 · 3 nights · Compare return dates departing Nov 19, 2026Alaska AirlinesNonstopAxel-exclusive $327.83
Nov 20, 2026 – Nov 23, 2026 · 3 nights · Compare return dates departing Nov 20, 2026Frontier AirlinesNonstopAxel-exclusive $193.88
Nov 20, 2026 – Nov 23, 2026 · 3 nights · Compare return dates departing Nov 20, 2026Alaska AirlinesNonstopAxel-exclusive $327.83
Nov 21, 2026 – Nov 28, 2026 · 7 nights · Compare return dates departing Nov 21, 2026Frontier AirlinesNonstopAxel-exclusive $222.76
Nov 21, 2026 – Nov 28, 2026 · 7 nights · Compare return dates departing Nov 21, 2026Alaska AirlinesNonstopAxel-exclusive $376.66
Nov 24, 2026 · One way · Compare return dates departing Nov 24, 2026Alaska AirlinesNonstopAxel-exclusive $195.75
Nov 24, 2026 · One way · Compare return dates departing Nov 24, 2026Delta Air LinesNonstopAxel-exclusive $202.50
Nov 24, 2026 – Nov 29, 2026 · 5 nights · Compare return dates departing Nov 24, 2026American Airlines / Frontier AirlinesUp to 1 stop each wayAxel-exclusive $351.01
Nov 24, 2026 – Nov 29, 2026 · 5 nights · Compare return dates departing Nov 24, 2026Alaska AirlinesNonstopAxel-exclusive $376.66
Nov 26, 2026 – Nov 29, 2026 · 3 nights · Compare return dates departing Nov 26, 2026Frontier AirlinesNonstopAxel-exclusive $222.76
Nov 26, 2026 – Nov 29, 2026 · 3 nights · Compare return dates departing Nov 26, 2026Alaska AirlinesNonstopAxel-exclusive $376.66
Nov 27, 2026 – Nov 30, 2026 · 3 nights · Compare return dates departing Nov 27, 2026Frontier AirlinesNonstopAxel-exclusive $222.76
Nov 27, 2026 – Nov 30, 2026 · 3 nights · Compare return dates departing Nov 27, 2026Alaska AirlinesNonstopAxel-exclusive $376.66
Nov 28, 2026 – Dec 5, 2026 · 7 nights · Compare return dates departing Nov 28, 2026Frontier AirlinesNonstopAxel-exclusive $193.88
Nov 28, 2026 – Dec 5, 2026 · 7 nights · Compare return dates departing Nov 28, 2026Alaska AirlinesNonstopAxel-exclusive $327.83

Seattle (SEA) to Ontario (ONT): December 2026

Travel datesAirlineStopsTotal price
Dec 1, 2026 · One way · Compare return dates departing Dec 1, 2026Alaska AirlinesNonstopAxel-exclusive $145.00
Dec 1, 2026 · One way · Compare return dates departing Dec 1, 2026Delta Air LinesNonstopAxel-exclusive $150.00
Dec 3, 2026 – Dec 6, 2026 · 3 nights · Compare return dates departing Dec 3, 2026Frontier AirlinesNonstopAxel-exclusive $165.00
Dec 3, 2026 – Dec 6, 2026 · 3 nights · Compare return dates departing Dec 3, 2026Alaska AirlinesNonstopAxel-exclusive $279.00
Dec 4, 2026 – Dec 7, 2026 · 3 nights · Compare return dates departing Dec 4, 2026Frontier AirlinesNonstopAxel-exclusive $165.00
Dec 4, 2026 – Dec 7, 2026 · 3 nights · Compare return dates departing Dec 4, 2026Alaska AirlinesNonstopAxel-exclusive $279.00
Dec 5, 2026 – Dec 12, 2026 · 7 nights · Compare return dates departing Dec 5, 2026Frontier AirlinesNonstopAxel-exclusive $165.00
Dec 5, 2026 – Dec 12, 2026 · 7 nights · Compare return dates departing Dec 5, 2026Alaska AirlinesNonstopAxel-exclusive $279.00
Dec 8, 2026 · One way · Compare return dates departing Dec 8, 2026Alaska AirlinesNonstopAxel-exclusive $145.00
Dec 8, 2026 · One way · Compare return dates departing Dec 8, 2026Delta Air LinesNonstopAxel-exclusive $150.00
Dec 10, 2026 – Dec 13, 2026 · 3 nights · Compare return dates departing Dec 10, 2026Frontier AirlinesNonstopAxel-exclusive $165.00
Dec 10, 2026 – Dec 13, 2026 · 3 nights · Compare return dates departing Dec 10, 2026Alaska AirlinesNonstopAxel-exclusive $279.00
Dec 11, 2026 – Dec 14, 2026 · 3 nights · Compare return dates departing Dec 11, 2026Frontier AirlinesNonstopAxel-exclusive $165.00
Dec 11, 2026 – Dec 14, 2026 · 3 nights · Compare return dates departing Dec 11, 2026Alaska AirlinesNonstopAxel-exclusive $279.00
Dec 12, 2026 – Dec 19, 2026 · 7 nights · Compare return dates departing Dec 12, 2026Frontier AirlinesNonstopAxel-exclusive $198.00
Dec 12, 2026 – Dec 19, 2026 · 7 nights · Compare return dates departing Dec 12, 2026Alaska AirlinesNonstopAxel-exclusive $334.80
Dec 15, 2026 · One way · Compare return dates departing Dec 15, 2026Alaska AirlinesNonstopAxel-exclusive $145.00
Dec 15, 2026 · One way · Compare return dates departing Dec 15, 2026Delta Air LinesNonstopAxel-exclusive $150.00
Dec 17, 2026 – Dec 20, 2026 · 3 nights · Compare return dates departing Dec 17, 2026Frontier AirlinesNonstopAxel-exclusive $198.00
Dec 17, 2026 – Dec 20, 2026 · 3 nights · Compare return dates departing Dec 17, 2026Alaska AirlinesNonstopAxel-exclusive $334.80
Dec 18, 2026 – Dec 21, 2026 · 3 nights · Compare return dates departing Dec 18, 2026Frontier AirlinesNonstopAxel-exclusive $198.00
Dec 18, 2026 – Dec 21, 2026 · 3 nights · Compare return dates departing Dec 18, 2026Alaska AirlinesNonstopAxel-exclusive $334.80
Dec 19, 2026 – Dec 26, 2026 · 7 nights · Compare return dates departing Dec 19, 2026Frontier AirlinesNonstopAxel-exclusive $231.00
Dec 19, 2026 – Dec 26, 2026 · 7 nights · Compare return dates departing Dec 19, 2026Alaska AirlinesNonstopAxel-exclusive $390.60
Dec 22, 2026 · One way · Compare return dates departing Dec 22, 2026Alaska AirlinesNonstopAxel-exclusive $203.00
Dec 22, 2026 · One way · Compare return dates departing Dec 22, 2026Delta Air LinesNonstopAxel-exclusive $210.00
Dec 22, 2026 – Dec 27, 2026 · 5 nights · Compare return dates departing Dec 22, 2026Alaska AirlinesNonstopAxel-exclusive $390.60
Dec 22, 2026 – Dec 27, 2026 · 5 nights · Compare return dates departing Dec 22, 2026Delta Air LinesNonstopAxel-exclusive $404.60
Dec 24, 2026 – Dec 27, 2026 · 3 nights · Compare return dates departing Dec 24, 2026Frontier AirlinesNonstopAxel-exclusive $231.00
Dec 24, 2026 – Dec 27, 2026 · 3 nights · Compare return dates departing Dec 24, 2026Alaska AirlinesNonstopAxel-exclusive $390.60
Dec 25, 2026 – Dec 28, 2026 · 3 nights · Compare return dates departing Dec 25, 2026Frontier AirlinesNonstopAxel-exclusive $231.00
Dec 25, 2026 – Dec 28, 2026 · 3 nights · Compare return dates departing Dec 25, 2026Alaska AirlinesNonstopAxel-exclusive $390.60
Dec 26, 2026 – Jan 2, 2027 · 7 nights · Compare return dates departing Dec 26, 2026Frontier AirlinesNonstopAxel-exclusive $231.00
Dec 26, 2026 – Jan 2, 2027 · 7 nights · Compare return dates departing Dec 26, 2026Alaska AirlinesNonstopAxel-exclusive $390.60
Dec 29, 2026 · One way · Compare return dates departing Dec 29, 2026Frontier AirlinesUp to 1 stop each wayAxel-exclusive $161.00
Dec 29, 2026 · One way · Compare return dates departing Dec 29, 2026Alaska AirlinesNonstopAxel-exclusive $203.00
Dec 30, 2026 – Jan 2, 2027 · 3 nights · Compare return dates departing Dec 30, 2026Frontier AirlinesNonstopAxel-exclusive $231.00
Dec 30, 2026 – Jan 2, 2027 · 3 nights · Compare return dates departing Dec 30, 2026Alaska AirlinesNonstopAxel-exclusive $390.60
Dec 31, 2026 – Jan 3, 2027 · 3 nights · Compare return dates departing Dec 31, 2026Frontier AirlinesNonstopAxel-exclusive $231.00
Dec 31, 2026 – Jan 3, 2027 · 3 nights · Compare return dates departing Dec 31, 2026Alaska AirlinesNonstopAxel-exclusive $390.60

Seattle (SEA) to Ontario (ONT): January 2027

Travel datesAirlineStopsTotal price
Jan 1, 2027 – Jan 4, 2027 · 3 nights · Compare return dates departing Jan 1, 2027Frontier AirlinesNonstopAxel-exclusive $198.00
Jan 1, 2027 – Jan 4, 2027 · 3 nights · Compare return dates departing Jan 1, 2027Alaska AirlinesNonstopAxel-exclusive $334.80
Jan 2, 2027 – Jan 9, 2027 · 7 nights · Compare return dates departing Jan 2, 2027Frontier AirlinesNonstopAxel-exclusive $198.00
Jan 2, 2027 – Jan 9, 2027 · 7 nights · Compare return dates departing Jan 2, 2027Alaska AirlinesNonstopAxel-exclusive $334.80
Jan 5, 2027 · One way · Compare return dates departing Jan 5, 2027Frontier AirlinesUp to 1 stop each wayAxel-exclusive $115.00
Jan 5, 2027 · One way · Compare return dates departing Jan 5, 2027Alaska AirlinesNonstopAxel-exclusive $145.00
Jan 7, 2027 – Jan 10, 2027 · 3 nights · Compare return dates departing Jan 7, 2027Frontier AirlinesNonstopAxel-exclusive $165.00
Jan 7, 2027 – Jan 10, 2027 · 3 nights · Compare return dates departing Jan 7, 2027Alaska AirlinesNonstopAxel-exclusive $279.00
Jan 8, 2027 – Jan 11, 2027 · 3 nights · Compare return dates departing Jan 8, 2027Frontier AirlinesNonstopAxel-exclusive $165.00
Jan 8, 2027 – Jan 11, 2027 · 3 nights · Compare return dates departing Jan 8, 2027Alaska AirlinesNonstopAxel-exclusive $279.00
Jan 9, 2027 – Jan 16, 2027 · 7 nights · Compare return dates departing Jan 9, 2027Frontier AirlinesNonstopAxel-exclusive $165.00
Jan 9, 2027 – Jan 16, 2027 · 7 nights · Compare return dates departing Jan 9, 2027Alaska AirlinesNonstopAxel-exclusive $279.00
Jan 12, 2027 · One way · Compare return dates departing Jan 12, 2027Frontier AirlinesUp to 1 stop each wayAxel-exclusive $115.00
Jan 12, 2027 · One way · Compare return dates departing Jan 12, 2027Alaska AirlinesNonstopAxel-exclusive $145.00
Jan 14, 2027 – Jan 17, 2027 · 3 nights · Compare return dates departing Jan 14, 2027Frontier AirlinesNonstopAxel-exclusive $165.00
Jan 14, 2027 – Jan 17, 2027 · 3 nights · Compare return dates departing Jan 14, 2027Alaska AirlinesNonstopAxel-exclusive $279.00
Jan 15, 2027 – Jan 18, 2027 · 3 nights · Compare return dates departing Jan 15, 2027Frontier AirlinesNonstopAxel-exclusive $165.00
Jan 15, 2027 – Jan 18, 2027 · 3 nights · Compare return dates departing Jan 15, 2027Alaska AirlinesNonstopAxel-exclusive $279.00
Jan 16, 2027 – Jan 23, 2027 · 7 nights · Compare return dates departing Jan 16, 2027Frontier AirlinesNonstopAxel-exclusive $165.00
Jan 16, 2027 – Jan 23, 2027 · 7 nights · Compare return dates departing Jan 16, 2027Alaska AirlinesNonstopAxel-exclusive $279.00
Jan 19, 2027 · One way · Compare return dates departing Jan 19, 2027Frontier AirlinesUp to 1 stop each wayAxel-exclusive $115.00
Jan 19, 2027 · One way · Compare return dates departing Jan 19, 2027Alaska AirlinesNonstopAxel-exclusive $145.00
Jan 21, 2027 – Jan 24, 2027 · 3 nights · Compare return dates departing Jan 21, 2027Frontier AirlinesNonstopAxel-exclusive $165.00
Jan 21, 2027 – Jan 24, 2027 · 3 nights · Compare return dates departing Jan 21, 2027Alaska AirlinesNonstopAxel-exclusive $279.00
Jan 22, 2027 – Jan 25, 2027 · 3 nights · Compare return dates departing Jan 22, 2027Frontier AirlinesNonstopAxel-exclusive $165.00
Jan 22, 2027 – Jan 25, 2027 · 3 nights · Compare return dates departing Jan 22, 2027Alaska AirlinesNonstopAxel-exclusive $279.00
Jan 23, 2027 – Jan 30, 2027 · 7 nights · Compare return dates departing Jan 23, 2027Frontier AirlinesNonstopAxel-exclusive $165.00
Jan 23, 2027 – Jan 30, 2027 · 7 nights · Compare return dates departing Jan 23, 2027Alaska AirlinesNonstopAxel-exclusive $279.00
Jan 26, 2027 · One way · Compare return dates departing Jan 26, 2027Frontier AirlinesUp to 1 stop each wayAxel-exclusive $115.00
Jan 26, 2027 · One way · Compare return dates departing Jan 26, 2027Alaska AirlinesNonstopAxel-exclusive $145.00
Jan 28, 2027 – Jan 31, 2027 · 3 nights · Compare return dates departing Jan 28, 2027Frontier AirlinesNonstopAxel-exclusive $165.00
Jan 28, 2027 – Jan 31, 2027 · 3 nights · Compare return dates departing Jan 28, 2027Alaska AirlinesNonstopAxel-exclusive $279.00
Jan 29, 2027 – Feb 1, 2027 · 3 nights · Compare return dates departing Jan 29, 2027Frontier AirlinesNonstopAxel-exclusive $165.00
Jan 29, 2027 – Feb 1, 2027 · 3 nights · Compare return dates departing Jan 29, 2027Alaska AirlinesNonstopAxel-exclusive $279.00
Jan 30, 2027 – Feb 6, 2027 · 7 nights · Compare return dates departing Jan 30, 2027Frontier AirlinesNonstopAxel-exclusive $165.00
Jan 30, 2027 – Feb 6, 2027 · 7 nights · Compare return dates departing Jan 30, 2027Alaska AirlinesNonstopAxel-exclusive $279.00

Seattle (SEA) to Ontario (ONT): February 2027

Travel datesAirlineStopsTotal price
Feb 2, 2027 · One way · Compare return dates departing Feb 2, 2027Frontier AirlinesUp to 1 stop each wayAxel-exclusive $115.00
Feb 2, 2027 · One way · Compare return dates departing Feb 2, 2027Alaska AirlinesNonstopAxel-exclusive $145.00
Feb 4, 2027 – Feb 7, 2027 · 3 nights · Compare return dates departing Feb 4, 2027Frontier AirlinesNonstopAxel-exclusive $165.00
Feb 4, 2027 – Feb 7, 2027 · 3 nights · Compare return dates departing Feb 4, 2027Alaska AirlinesNonstopAxel-exclusive $279.00
Feb 5, 2027 – Feb 8, 2027 · 3 nights · Compare return dates departing Feb 5, 2027Frontier AirlinesNonstopAxel-exclusive $165.00
Feb 5, 2027 – Feb 8, 2027 · 3 nights · Compare return dates departing Feb 5, 2027Alaska AirlinesNonstopAxel-exclusive $279.00
Feb 6, 2027 – Feb 13, 2027 · 7 nights · Compare return dates departing Feb 6, 2027Frontier AirlinesNonstopAxel-exclusive $177.38
Feb 6, 2027 – Feb 13, 2027 · 7 nights · Compare return dates departing Feb 6, 2027Alaska AirlinesNonstopAxel-exclusive $299.93
Feb 12, 2027 – Feb 15, 2027 · 3 nights · Compare return dates departing Feb 12, 2027Frontier AirlinesNonstopAxel-exclusive $189.76
Feb 12, 2027 – Feb 15, 2027 · 3 nights · Compare return dates departing Feb 12, 2027Alaska AirlinesNonstopAxel-exclusive $320.86
Feb 19, 2027 – Feb 22, 2027 · 3 nights · Compare return dates departing Feb 19, 2027Frontier AirlinesNonstopAxel-exclusive $165.00
Feb 19, 2027 – Feb 22, 2027 · 3 nights · Compare return dates departing Feb 19, 2027Alaska AirlinesNonstopAxel-exclusive $279.00
Feb 20, 2027 – Feb 27, 2027 · 7 nights · Compare return dates departing Feb 20, 2027Frontier AirlinesNonstopAxel-exclusive $165.00
Feb 20, 2027 – Feb 27, 2027 · 7 nights · Compare return dates departing Feb 20, 2027Alaska AirlinesNonstopAxel-exclusive $279.00

Seattle (SEA) to Ontario (ONT): March 2027

Travel datesAirlineStopsTotal price
Mar 19, 2027 – Mar 22, 2027 · 3 nights · Compare return dates departing Mar 19, 2027Frontier AirlinesNonstopAxel-exclusive $165.00
Mar 19, 2027 – Mar 22, 2027 · 3 nights · Compare return dates departing Mar 19, 2027Alaska AirlinesNonstopAxel-exclusive $279.00
Mar 20, 2027 – Mar 27, 2027 · 7 nights · Compare return dates departing Mar 20, 2027Frontier AirlinesNonstopAxel-exclusive $181.50
Mar 20, 2027 – Mar 27, 2027 · 7 nights · Compare return dates departing Mar 20, 2027Alaska AirlinesNonstopAxel-exclusive $306.90
Mar 25, 2027 – Mar 29, 2027 · 4 nights · Compare return dates departing Mar 25, 2027Frontier AirlinesNonstopAxel-exclusive $211.50
Mar 25, 2027 – Mar 29, 2027 · 4 nights · Compare return dates departing Mar 25, 2027Alaska AirlinesNonstopAxel-exclusive $342.90

Seattle (SEA) to Ontario (ONT): April 2027

Travel datesAirlineStopsTotal price
Apr 16, 2027 – Apr 19, 2027 · 3 nights · Compare return dates departing Apr 16, 2027Frontier AirlinesNonstopAxel-exclusive $215.00
Apr 16, 2027 – Apr 19, 2027 · 3 nights · Compare return dates departing Apr 16, 2027Alaska AirlinesNonstopAxel-exclusive $339.00
Apr 17, 2027 – Apr 24, 2027 · 7 nights · Compare return dates departing Apr 17, 2027Frontier AirlinesNonstopAxel-exclusive $215.00
Apr 17, 2027 – Apr 24, 2027 · 7 nights · Compare return dates departing Apr 17, 2027Alaska AirlinesNonstopAxel-exclusive $339.00

Seattle (SEA) to Ontario (ONT): May 2027

Travel datesAirlineStopsTotal price
May 14, 2027 – May 17, 2027 · 3 nights · Compare return dates departing May 14, 2027Frontier AirlinesNonstopAxel-exclusive $215.00
May 14, 2027 – May 17, 2027 · 3 nights · Compare return dates departing May 14, 2027Alaska AirlinesNonstopAxel-exclusive $339.00
May 15, 2027 – May 22, 2027 · 7 nights · Compare return dates departing May 15, 2027Frontier AirlinesNonstopAxel-exclusive $215.00
May 15, 2027 – May 22, 2027 · 7 nights · Compare return dates departing May 15, 2027Alaska AirlinesNonstopAxel-exclusive $339.00
May 28, 2027 – May 31, 2027 · 3 nights · Compare return dates departing May 28, 2027Frontier AirlinesNonstopAxel-exclusive $247.26
May 28, 2027 – May 31, 2027 · 3 nights · Compare return dates departing May 28, 2027Alaska AirlinesNonstopAxel-exclusive $389.86

Seattle (SEA) to Ontario (ONT): June 2027

Travel datesAirlineStopsTotal price
Jun 11, 2027 – Jun 14, 2027 · 3 nights · Compare return dates departing Jun 11, 2027Frontier AirlinesNonstopAxel-exclusive $215.00
Jun 11, 2027 – Jun 14, 2027 · 3 nights · Compare return dates departing Jun 11, 2027Alaska AirlinesNonstopAxel-exclusive $339.00
Jun 12, 2027 – Jun 19, 2027 · 7 nights · Compare return dates departing Jun 12, 2027Frontier AirlinesNonstopAxel-exclusive $215.00
Jun 12, 2027 – Jun 19, 2027 · 7 nights · Compare return dates departing Jun 12, 2027Alaska AirlinesNonstopAxel-exclusive $339.00

Seattle (SEA) to Ontario (ONT): July 2027

Travel datesAirlineStopsTotal price
Jul 2, 2027 – Jul 6, 2027 · 4 nights · Compare return dates departing Jul 2, 2027Frontier AirlinesNonstopAxel-exclusive $247.26
Jul 2, 2027 – Jul 6, 2027 · 4 nights · Compare return dates departing Jul 2, 2027Alaska AirlinesNonstopAxel-exclusive $389.86
Jul 9, 2027 – Jul 12, 2027 · 3 nights · Compare return dates departing Jul 9, 2027Frontier AirlinesNonstopAxel-exclusive $215.00
Jul 9, 2027 – Jul 12, 2027 · 3 nights · Compare return dates departing Jul 9, 2027Alaska AirlinesNonstopAxel-exclusive $339.00
Jul 10, 2027 – Jul 17, 2027 · 7 nights · Compare return dates departing Jul 10, 2027Frontier AirlinesNonstopAxel-exclusive $215.00
Jul 10, 2027 – Jul 17, 2027 · 7 nights · Compare return dates departing Jul 10, 2027Alaska AirlinesNonstopAxel-exclusive $339.00

Seattle (SEA) to Ontario (ONT): August 2027

Travel datesAirlineStopsTotal price
Aug 6, 2027 – Aug 9, 2027 · 3 nights · Compare return dates departing Aug 6, 2027Frontier AirlinesNonstopAxel-exclusive $215.00
Aug 6, 2027 – Aug 9, 2027 · 3 nights · Compare return dates departing Aug 6, 2027Alaska AirlinesNonstopAxel-exclusive $339.00
Aug 7, 2027 – Aug 14, 2027 · 7 nights · Compare return dates departing Aug 7, 2027Frontier AirlinesNonstopAxel-exclusive $215.00
Aug 7, 2027 – Aug 14, 2027 · 7 nights · Compare return dates departing Aug 7, 2027Alaska AirlinesNonstopAxel-exclusive $339.00

Seattle (SEA) to Ontario (ONT): September 2027

Travel datesAirlineStopsTotal price
Sep 3, 2027 – Sep 6, 2027 · 3 nights · Compare return dates departing Sep 3, 2027Frontier AirlinesNonstopAxel-exclusive $247.26
Sep 3, 2027 – Sep 6, 2027 · 3 nights · Compare return dates departing Sep 3, 2027Alaska AirlinesNonstopAxel-exclusive $389.86
Sep 4, 2027 – Sep 11, 2027 · 7 nights · Compare return dates departing Sep 4, 2027Frontier AirlinesNonstopAxel-exclusive $231.13
Sep 4, 2027 – Sep 11, 2027 · 7 nights · Compare return dates departing Sep 4, 2027Alaska AirlinesNonstopAxel-exclusive $364.43
Sep 24, 2027 – Sep 27, 2027 · 3 nights · Compare return dates departing Sep 24, 2027Frontier AirlinesNonstopAxel-exclusive $215.00
Sep 24, 2027 – Sep 27, 2027 · 3 nights · Compare return dates departing Sep 24, 2027Alaska AirlinesNonstopAxel-exclusive $339.00
Sep 25, 2027 – Oct 2, 2027 · 7 nights · Compare return dates departing Sep 25, 2027Frontier AirlinesNonstopAxel-exclusive $215.00
Sep 25, 2027 – Oct 2, 2027 · 7 nights · Compare return dates departing Sep 25, 2027Alaska AirlinesNonstopAxel-exclusive $339.00

Route overview: Seattle to Ontario (ONT) flight deals

2026-11-19 → 2026-11-22 · Axel-exclusive $193.88

  • Frontier Airlines F92276: SEA 2026-11-19 10:50:00 → ONT 2026-11-19 13:38:00; nonstop; 168 minutes. Local airport times.
  • Frontier Airlines F92275: ONT 2026-11-22 06:00:00 → SEA 2026-11-22 09:03:00; nonstop; 183 minutes. Local airport times.

2026-11-19 → 2026-11-22 · Axel-exclusive $327.83

  • Alaska Airlines AS594: SEA 2026-11-19 15:41:00 → ONT 2026-11-19 18:17:00; nonstop; 156 minutes. Local airport times.
  • Alaska Airlines AS575: ONT 2026-11-22 12:02:00 → SEA 2026-11-22 14:49:00; nonstop; 167 minutes. Local airport times.

2026-11-24 · one way · Axel-exclusive $195.75

  • Alaska Airlines AS571: SEA 2026-11-24 13:33:00 → ONT 2026-11-24 16:05:00; nonstop; 152 minutes. Local airport times.

2026-11-24 · one way · Axel-exclusive $202.50

  • Delta Air Lines DL4070: SEA 2026-11-24 08:25:00 → ONT 2026-11-24 11:17:00; nonstop; 172 minutes. Local airport times.

2026-11-28 → 2026-12-05 · Axel-exclusive $193.88

  • Frontier Airlines F92276: SEA 2026-11-28 10:18:00 → ONT 2026-11-28 13:06:00; nonstop; 168 minutes. Local airport times.
  • Frontier Airlines F92275: ONT 2026-12-05 06:00:00 → SEA 2026-12-05 09:03:00; nonstop; 183 minutes. Local airport times.

2026-11-28 → 2026-12-05 · Axel-exclusive $374.83

  • Southwest Airlines WN3105 / WN1383: SEA 2026-11-28 08:05:00 → ONT 2026-11-28 12:40:00; 1 stop(s) via SJC; 275 minutes. Local airport times.
    • WN3105: SEA 2026-11-28 08:05:00 → SJC 2026-11-28 10:20:00; layover at SJC: 60 minutes.
    • WN1383: SJC 2026-11-28 11:20:00 → ONT 2026-11-28 12:40:00.
  • Southwest Airlines WN3313 / WN4608: ONT 2026-12-05 16:05:00 → SEA 2026-12-05 21:40:00; 1 stop(s) via OAK; 335 minutes. Local airport times.
    • WN3313: ONT 2026-12-05 16:05:00 → OAK 2026-12-05 17:30:00; layover at OAK: 110 minutes.
    • WN4608: OAK 2026-12-05 19:20:00 → SEA 2026-12-05 21:40:00.

2026-12-12 → 2026-12-19 · Axel-exclusive $198.00

  • Frontier Airlines F92276: SEA 2026-12-12 10:18:00 → ONT 2026-12-12 13:06:00; nonstop; 168 minutes. Local airport times.
  • Frontier Airlines F92275: ONT 2026-12-19 06:00:00 → SEA 2026-12-19 09:03:00; nonstop; 183 minutes. Local airport times.

2026-12-12 → 2026-12-19 · Axel-exclusive $400.80

  • American Airlines AA2073 / AA1841: SEA 2026-12-12 15:00:00 → ONT 2026-12-12 21:52:00; 1 stop(s) via PHX; 412 minutes. Local airport times.
    • AA2073: SEA 2026-12-12 15:00:00 → PHX 2026-12-12 18:52:00; layover at PHX: 163 minutes.
    • AA1841: PHX 2026-12-12 21:35:00 → ONT 2026-12-12 21:52:00.
  • Southwest Airlines WN3313 / WN4608: ONT 2026-12-19 16:05:00 → SEA 2026-12-19 21:40:00; 1 stop(s) via OAK; 335 minutes. Local airport times.
    • WN3313: ONT 2026-12-19 16:05:00 → OAK 2026-12-19 17:30:00; layover at OAK: 110 minutes.
    • WN4608: OAK 2026-12-19 19:20:00 → SEA 2026-12-19 21:40:00.

2026-12-25 → 2026-12-28 · Axel-exclusive $231.00

  • Frontier Airlines F92276: SEA 2026-12-25 10:18:00 → ONT 2026-12-25 13:06:00; nonstop; 168 minutes. Local airport times.
  • Frontier Airlines F92275: ONT 2026-12-28 06:00:00 → SEA 2026-12-28 09:03:00; nonstop; 183 minutes. Local airport times.

2026-12-25 → 2026-12-28 · Axel-exclusive $390.60

  • Alaska Airlines AS571: SEA 2026-12-25 12:20:00 → ONT 2026-12-25 15:03:00; nonstop; 163 minutes. Local airport times.
  • Alaska Airlines AS677: ONT 2026-12-28 11:57:00 → SEA 2026-12-28 14:49:00; nonstop; 172 minutes. Local airport times.

2027-01-07 → 2027-01-10 · Axel-exclusive $165.00

  • Frontier Airlines F92276: SEA 2027-01-07 10:50:00 → ONT 2027-01-07 13:38:00; nonstop; 168 minutes. Local airport times.
  • Frontier Airlines F92275: ONT 2027-01-10 06:00:00 → SEA 2027-01-10 09:03:00; nonstop; 183 minutes. Local airport times.

2027-01-07 → 2027-01-10 · Axel-exclusive $279.00

  • Alaska Airlines AS571: SEA 2027-01-07 12:20:00 → ONT 2027-01-07 15:03:00; nonstop; 163 minutes. Local airport times.
  • Alaska Airlines AS677: ONT 2027-01-10 11:57:00 → SEA 2027-01-10 14:49:00; nonstop; 172 minutes. Local airport times.

2027-01-21 → 2027-01-24 · Axel-exclusive $165.00

  • Frontier Airlines F92276: SEA 2027-01-21 10:50:00 → ONT 2027-01-21 13:38:00; nonstop; 168 minutes. Local airport times.
  • Frontier Airlines F92275: ONT 2027-01-24 06:00:00 → SEA 2027-01-24 09:03:00; nonstop; 183 minutes. Local airport times.

2027-01-21 → 2027-01-24 · Axel-exclusive $279.00

  • Alaska Airlines AS571: SEA 2027-01-21 12:20:00 → ONT 2027-01-21 15:03:00; nonstop; 163 minutes. Local airport times.
  • Alaska Airlines AS677: ONT 2027-01-24 11:57:00 → SEA 2027-01-24 14:49:00; nonstop; 172 minutes. Local airport times.

2027-02-04 → 2027-02-07 · Axel-exclusive $165.00

  • Frontier Airlines F92276: SEA 2027-02-04 10:50:00 → ONT 2027-02-04 13:38:00; nonstop; 168 minutes. Local airport times.
  • Frontier Airlines F92275: ONT 2027-02-07 06:00:00 → SEA 2027-02-07 09:03:00; nonstop; 183 minutes. Local airport times.

2027-02-04 → 2027-02-07 · Axel-exclusive $359.00

  • United Airlines UA2478 / UA552: SEA 2027-02-04 15:24:00 → ONT 2027-02-04 22:53:00; 1 stop(s) via SFO; 449 minutes. Local airport times.
    • UA2478: SEA 2027-02-04 15:24:00 → SFO 2027-02-04 17:45:00; layover at SFO: 225 minutes.
    • UA552: SFO 2027-02-04 21:30:00 → ONT 2027-02-04 22:53:00.
  • United Airlines UA2363 / UA2192: ONT 2027-02-07 06:00:00 → SEA 2027-02-07 12:18:00; 1 stop(s) via SFO; 378 minutes. Local airport times.
    • UA2363: ONT 2027-02-07 06:00:00 → SFO 2027-02-07 07:30:00; layover at SFO: 155 minutes.
    • UA2192: SFO 2027-02-07 10:05:00 → SEA 2027-02-07 12:18:00.

2027-03-19 → 2027-03-22 · Axel-exclusive $289.00

  • Delta Air Lines DL4031: SEA 2027-03-19 11:59:00 → ONT 2027-03-19 14:50:00; nonstop; 171 minutes. Local airport times.
  • Delta Air Lines DL4031: ONT 2027-03-22 17:38:00 → SEA 2027-03-22 20:43:00; nonstop; 185 minutes. Local airport times.

2027-03-19 → 2027-03-22 · Axel-exclusive $359.00

  • United Airlines UA2478 / UA552: SEA 2027-03-19 15:24:00 → ONT 2027-03-19 22:53:00; 1 stop(s) via SFO; 449 minutes. Local airport times.
    • UA2478: SEA 2027-03-19 15:24:00 → SFO 2027-03-19 17:45:00; layover at SFO: 225 minutes.
    • UA552: SFO 2027-03-19 21:30:00 → ONT 2027-03-19 22:53:00.
  • United Airlines UA2363 / UA2192: ONT 2027-03-22 06:00:00 → SEA 2027-03-22 12:18:00; 1 stop(s) via SFO; 378 minutes. Local airport times.
    • UA2363: ONT 2027-03-22 06:00:00 → SFO 2027-03-22 07:30:00; layover at SFO: 155 minutes.
    • UA2192: SFO 2027-03-22 10:05:00 → SEA 2027-03-22 12:18:00.

2027-05-15 → 2027-05-22 · Axel-exclusive $215.00

  • Frontier Airlines F92276: SEA 2027-05-15 10:18:00 → ONT 2027-05-15 13:06:00; nonstop; 168 minutes. Local airport times.
  • Frontier Airlines F92275: ONT 2027-05-22 06:00:00 → SEA 2027-05-22 09:03:00; nonstop; 183 minutes. Local airport times.

2027-05-15 → 2027-05-22 · Axel-exclusive $339.00

  • Alaska Airlines AS571: SEA 2027-05-15 12:20:00 → ONT 2027-05-15 15:03:00; nonstop; 163 minutes. Local airport times.
  • Alaska Airlines AS677: ONT 2027-05-22 11:57:00 → SEA 2027-05-22 14:49:00; nonstop; 172 minutes. Local airport times.

2027-07-10 → 2027-07-17 · Axel-exclusive $215.00

  • Frontier Airlines F92276: SEA 2027-07-10 10:18:00 → ONT 2027-07-10 13:06:00; nonstop; 168 minutes. Local airport times.
  • Frontier Airlines F92275: ONT 2027-07-17 06:00:00 → SEA 2027-07-17 09:03:00; nonstop; 183 minutes. Local airport times.

2027-07-10 → 2027-07-17 · Axel-exclusive $339.00

  • Alaska Airlines AS571: SEA 2027-07-10 12:20:00 → ONT 2027-07-10 15:03:00; nonstop; 163 minutes. Local airport times.
  • Alaska Airlines AS677: ONT 2027-07-17 11:57:00 → SEA 2027-07-17 14:49:00; nonstop; 172 minutes. Local airport times.

2027-09-25 → 2027-10-02 · Axel-exclusive $215.00

  • Frontier Airlines F92276: SEA 2027-09-25 10:18:00 → ONT 2027-09-25 13:06:00; nonstop; 168 minutes. Local airport times.
  • Frontier Airlines F92275: ONT 2027-10-02 06:00:00 → SEA 2027-10-02 09:03:00; nonstop; 183 minutes. Local airport times.

2027-09-25 → 2027-10-02 · Axel-exclusive $339.00

  • Alaska Airlines AS571: SEA 2027-09-25 12:20:00 → ONT 2027-09-25 15:03:00; nonstop; 163 minutes. Local airport times.
  • Alaska Airlines AS677: ONT 2027-10-02 11:57:00 → SEA 2027-10-02 14:49:00; nonstop; 172 minutes. Local airport times.

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Flights to Ontario (ONT) by departure city

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Fares observed November 2 – 8, 2026. USD for the travelers shown.

November 2026

1 adult · Economy · Round-trip totals

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FromDestinationTravel datesFlights (out / return)Axel-exclusiveAirline fareNext step
Seattle (SEA)Ontario (ONT)Nov 11–15, 2026 · 4 daysOut: Delta Air Lines 4070 · Nonstop · 2h 52m · 08:25–11:17 local; Return: Delta Air Lines 4070 · Nonstop · 2h 59m · 11:57–14:56 localAxel-exclusive $546 · Save $30$576Customer link — share with the traveler · See flights for these dates
Denver (DEN)Ontario (ONT)Nov 12–15, 2026 · 3 daysOut: Frontier Airlines 2349 / 1283 · 1 stop (LAS) · 4h 46m · 07:30–11:16 local; Return: Frontier Airlines 1406 / 2549 · 1 stop (DFW) · 11h 19m · 20:03–08:22 (November 16, 2026) localAxel-exclusive $341 · Save $19$360Customer link — share with the traveler · See flights for these dates
Denver (DEN)Ontario (ONT)Nov 12–15, 2026 · 3 daysOut: Frontier Airlines 2349 / 1283 · 1 stop (LAS) · 4h 46m · 07:30–11:16 local; Return: Frontier Airlines 1262 · Nonstop · 2h 21m · 11:52–15:13 localAxel-exclusive $465 · Save $27$492Customer link — share with the traveler · See flights for these dates
Seattle (SEA)Ontario (ONT)Nov 13–16, 2026 · 3 daysOut: Delta Air Lines 4070 · Nonstop · 2h 52m · 08:25–11:17 local; Return: Delta Air Lines 4070 · Nonstop · 2h 59m · 11:57–14:56 localAxel-exclusive $591 · Save $34$625Customer link — share with the traveler · See flights for these dates
San Francisco (SFO)Ontario (ONT)Nov 20–28, 2026 · 8 daysOut: Frontier Airlines 2678 · Nonstop · 1h 25m · 22:59–00:24 (November 21, 2026) local; Return: Frontier Airlines 1159 · Nonstop · 1h 33m · 20:31–22:04 localAxel-exclusive $366 · Save $19$385Customer link — share with the traveler · See flights for these dates
New York (JFK)Ontario (ONT)Nov 24–28, 2026 · 4 daysOut: American Airlines 1487 / 3016 · 1 stop (PHX) · 8h 45m · 07:00–12:45 local; Return: American Airlines 1666 / 1743 / 4764 · 2 stops (PHX, CLE) · 21h 15m · 19:45–20:00 (November 29, 2026) localAxel-exclusive $889 · Save $48$937Customer link — share with the traveler · See flights for these dates
New York (JFK)Ontario (ONT)Nov 24–28, 2026 · 4 daysOut: American Airlines 1487 / 3016 · 1 stop (PHX) · 8h 45m · 07:00–12:45 local; Return: American Airlines 1666 / 1280 · 1 stop (PHX) · 6h 55m · 19:45–05:40 (November 29, 2026) localAxel-exclusive $1,079 · Save $60$1,139Customer link — share with the traveler · See flights for these dates
Dallas (DFW)Ontario (ONT)Nov 26–29, 2026 · 3 daysOut: Frontier Airlines 1405 · Nonstop · 3h 19m · 05:01–06:20 local; Return: Frontier Airlines 1500 / 2550 · 1 stop (DEN) · 24h 45m · 06:45–09:30 (November 30, 2026) localAxel-exclusive $249 · Save $14$263Customer link — share with the traveler · See flights for these dates
Dallas (DFW)Ontario (ONT)Nov 26–29, 2026 · 3 daysOut: Frontier Airlines 1405 · Nonstop · 3h 19m · 05:01–06:20 local; Return: Frontier Airlines 4690 · Nonstop · 3h 7m · 18:08–23:15 localAxel-exclusive $424 · Save $24$448Customer link — share with the traveler · See flights for these dates

1 adult · Economy · Round-trip starting totals

FromDestinationTravel datesOutbound flightAxel-exclusiveAirline fareNext step
Minneapolis (MSP)Ontario (ONT)Nov 25–Dec 1, 2026 · 6 daysOut: Frontier Airlines 3199 / 2907 · 1 stop (DEN) · 22h 6m · 14:39–10:45 (November 26, 2026) localAxel-exclusive From $431 · Save $24From $455See flights for these dates
Minneapolis (MSP)Ontario (ONT)Nov 25–Dec 1, 2026 · 6 daysOut: Southwest Airlines 2712 / 2827 · 1 stop (DEN) · 5h 35m · 18:55–22:30 localAxel-exclusive From $516 · Save $29From $545See flights for these dates
Minneapolis (MSP)Ontario (ONT)Nov 25–30, 2026 · 5 daysOut: Frontier Airlines 3199 / 2907 · 1 stop (DEN) · 22h 6m · 14:39–10:45 (November 26, 2026) localAxel-exclusive From $470 · Save $25From $495See flights for these dates
Minneapolis (MSP)Ontario (ONT)Nov 25–30, 2026 · 5 daysOut: Southwest Airlines 2712 / 2827 · 1 stop (DEN) · 5h 35m · 18:55–22:30 localAxel-exclusive From $596 · Save $31From $627See flights for these dates

1 adult · Economy · One-way totals

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FromDestinationTravel datesOutbound flightAxel-exclusiveAirline fareNext step
Chicago (ORD)Ontario (ONT)Nov 12, 2026Out: Frontier Airlines 1483 / 2907 · 1 stop (DEN) · 6h 5m · 06:30–10:35 localAxel-exclusive $118 · Save $6$124Customer link — share with the traveler · See flights for these dates
Chicago (ORD)Ontario (ONT)Nov 12, 2026Out: United Airlines 1904 · Nonstop · 4h 32m · 16:15–18:47 localAxel-exclusive $171 · Save $10$181Customer link — share with the traveler · See flights for these dates
Chicago (ORD)Ontario (ONT)Nov 15, 2026Out: Frontier Airlines 3647 / 1923 · 1 stop (LAS) · 25h 6m · 17:15–16:21 (November 16, 2026) localAxel-exclusive $123 · Save $7$130Customer link — share with the traveler · See flights for these dates
Chicago (ORD)Ontario (ONT)Nov 15, 2026Out: United Airlines 1904 · Nonstop · 4h 32m · 16:15–18:47 localAxel-exclusive $359 · Save $20$379Customer link — share with the traveler · See flights for these dates
San Francisco (SFO)Ontario (ONT)Nov 25, 2026Out: Frontier Airlines 4156 / 1283 · 1 stop (LAS) · 10h 9m · 21:11–07:20 (November 26, 2026) localAxel-exclusive $160 · Save $9$169Customer link — share with the traveler · See flights for these dates
San Francisco (SFO)Ontario (ONT)Nov 25, 2026Out: Frontier Airlines 2678 · Nonstop · 1h 25m · 22:59–00:24 (November 26, 2026) localAxel-exclusive $174 · Save $10$184Customer link — share with the traveler · See flights for these dates

2 adults · 2 children · Economy · Round-trip totals

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FromDestinationTravel datesFlights (out / return)Axel-exclusiveAirline fareNext step
Atlanta (ATL)Ontario (ONT)Nov 19–28, 2026 · 9 daysOut: Delta Air Lines 2891 · Nonstop · 4h 39m · 16:55–18:34 local; Return: Delta Air Lines 779 · Nonstop · 3h 57m · 23:06–06:03 (November 29, 2026) local · Carry-on bag: included with this Delta Main Basic fare (airline fare details via Google Flights, November 2, 2026).Axel-exclusive $2,538 · Save $138$2,676Customer link — share with the traveler · See flights for these dates

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December 2026

1 adult · Economy · Round-trip totals

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FromDestinationTravel datesFlights (out / return)Axel-exclusiveAirline fareNext step
Denver (DEN)Ontario (ONT)Dec 1–8, 2026 · 7 daysOut: Frontier Airlines 1499 · Nonstop · 2h 25m · 20:55–22:20 local; Return: Frontier Airlines 1500 · Nonstop · 2h 24m · 06:00–09:24 localAxel-exclusive $110 · Save $6$116Customer link — share with the traveler · See flights for these dates
Dallas (DFW)Ontario (ONT)Dec 3–6, 2026 · 3 daysOut: American Airlines 1162 · Nonstop · 3h 22m · 20:16–21:38 local; Return: American Airlines 2153 / 1805 / 1658 · 2 stops (PHX, AUS) · 13h 1m · 16:25–07:26 (December 7, 2026) localAxel-exclusive $473 · Save $26$499Customer link — share with the traveler · See flights for these dates
Dallas (DFW)Ontario (ONT)Dec 3–6, 2026 · 3 daysOut: American Airlines 1162 · Nonstop · 3h 22m · 20:16–21:38 local; Return: American Airlines 1162 · Nonstop · 2h 57m · 23:59–04:56 (December 7, 2026) localAxel-exclusive $506 · Save $29$535Customer link — share with the traveler · See flights for these dates
San Francisco (SFO)Ontario (ONT)Dec 30, 2026–Jan 2, 2027 · 3 daysOut: United Airlines 552 · Nonstop · 1h 23m · 21:30–22:53 local; Return: United Airlines 2363 · Nonstop · 1h 33m · 06:00–07:33 localAxel-exclusive $235 · Save $13$248Customer link — share with the traveler · See flights for these dates

2 adults · Economy · Round-trip totals

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FromDestinationTravel datesFlights (out / return)Axel-exclusiveAirline fareNext step
Denver (DEN)Ontario (ONT)Dec 1–8, 2026 · 7 daysOut: Frontier Airlines 2907 · Nonstop · 2h 25m · 09:20–10:45 local; Return: Frontier Airlines 1500 · Nonstop · 2h 24m · 06:00–09:24 localAxel-exclusive $184 · Save $10$194Customer link — share with the traveler · See flights for these dates
Dallas (DFW)Ontario (ONT)Dec 3–6, 2026 · 3 daysOut: American Airlines 1162 · Nonstop · 3h 22m · 20:16–21:38 local; Return: American Airlines 2153 / 1805 / 1658 · 2 stops (PHX, AUS) · 13h 1m · 16:25–07:26 (December 7, 2026) localAxel-exclusive $893 · Save $52$945Customer link — share with the traveler · See flights for these dates
Dallas (DFW)Ontario (ONT)Dec 3–6, 2026 · 3 daysOut: American Airlines 1162 · Nonstop · 3h 22m · 20:16–21:38 local; Return: American Airlines 1162 · Nonstop · 2h 57m · 23:59–04:56 (December 7, 2026) localAxel-exclusive $964 · Save $54$1,018Customer link — share with the traveler · See flights for these dates
New York (JFK)Ontario (ONT)Dec 24–31, 2026 · 7 daysOut: American Airlines 1164 / 2346 · 1 stop (CLT) · 10h 21m · 07:49–15:10 local; Return: American Airlines 1423 / 1922 · 1 stop (PHX) · 9h 54m · 09:35–22:29 localAxel-exclusive $1,369 · Save $74$1,443Customer link — share with the traveler · See flights for these dates
New York (JFK)Ontario (ONT)Dec 24–31, 2026 · 7 daysOut: American Airlines 1164 / 2346 · 1 stop (CLT) · 10h 21m · 07:49–15:10 local; Return: American Airlines 3016 / 2315 · 1 stop (PHX) · 7h 32m · 13:27–23:59 localAxel-exclusive $1,724 · Save $91$1,815Customer link — share with the traveler · See flights for these dates

2 adults · 2 children · Economy · Round-trip totals

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FromDestinationTravel datesFlights (out / return)Axel-exclusiveAirline fareNext step
Minneapolis (MSP)Ontario (ONT)Dec 29, 2026–Jan 3, 2027 · 5 daysOut: Frontier Airlines 1455 / 1405 · 1 stop (DFW) · 10h 15m · 10:00–18:15 local; Return: Frontier Airlines 1406 / 1456 · 1 stop (DFW) · 13h 19m · 19:10–10:29 (January 4, 2027) localAxel-exclusive $1,495 · Save $81$1,576Customer link — share with the traveler · See flights for these dates
Minneapolis (MSP)Ontario (ONT)Dec 29, 2026–Jan 3, 2027 · 5 daysOut: Frontier Airlines 1455 / 1405 · 1 stop (DFW) · 10h 15m · 10:00–18:15 local; Return: Frontier Airlines 1500 / 1150 · 1 stop (DEN) · 5h 29m · 06:30–13:59 localAxel-exclusive $2,893 · Save $157$3,050Customer link — share with the traveler · See flights for these dates

1 adult · Economy · One-way totals

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FromDestinationTravel datesOutbound flightAxel-exclusiveAirline fareNext step
Chicago (ORD)Ontario (ONT)Dec 1, 2026Out: Frontier Airlines 2145 / 1357 · 1 stop (LAS) · 8h 18m · 06:21–12:39 localAxel-exclusive $113 · Save $6$119Customer link — share with the traveler · See flights for these dates
Chicago (ORD)Ontario (ONT)Dec 1, 2026Out: United Airlines 2430 · Nonstop · 4h 29m · 16:15–18:44 localAxel-exclusive $265 · Save $15$280Customer link — share with the traveler · See flights for these dates
Chicago (ORD)Ontario (ONT)Dec 2, 2026Out: Frontier Airlines 1483 / 1261 · 1 stop (DEN) · 17h 20m · 07:00–22:20 localAxel-exclusive $105 · Save $6$110Customer link — share with the traveler · See flights for these dates
Chicago (ORD)Ontario (ONT)Dec 2, 2026Out: United Airlines 2430 · Nonstop · 4h 29m · 16:15–18:44 localAxel-exclusive $265 · Save $15$280Customer link — share with the traveler · See flights for these dates

2 adults · Economy · One-way totals

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FromDestinationTravel datesOutbound flightAxel-exclusiveAirline fareNext step
Seattle (SEA)Ontario (ONT)Dec 18, 2026Out: Frontier Airlines 1916 / 1261 · 1 stop (DEN) · 10h 36m · 13:37–00:13 (December 19, 2026) localAxel-exclusive $325 · Save $17$342Customer link — share with the traveler · See flights for these dates
Seattle (SEA)Ontario (ONT)Dec 18, 2026Out: Alaska Airlines 594 · Nonstop · 2h 35m · 17:28–20:03 localAxel-exclusive $622 · Save $35$657Customer link — share with the traveler · See flights for these dates

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January 2027

1 adult · Economy · Round-trip totals

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FromDestinationTravel datesFlights (out / return)Axel-exclusiveAirline fareNext step
Atlanta (ATL)Ontario (ONT)Jan 7–11, 2027 · 4 daysOut: Frontier Airlines 3599 / 1261 · 1 stop (DEN) · 7h 19m · 19:56–00:15 (January 8, 2027) local; Return: Frontier Airlines 1284 / 3924 · 1 stop (LAS) · 16h 28m · 12:26–07:54 (January 12, 2027) localAxel-exclusive $232 · Save $13$245Customer link — share with the traveler · See flights for these dates
Atlanta (ATL)Ontario (ONT)Jan 7–11, 2027 · 4 daysOut: Frontier Airlines 3599 / 1261 · 1 stop (DEN) · 7h 19m · 19:56–00:15 (January 8, 2027) local; Return: Frontier Airlines 1406 / 3022 · 1 stop (DFW) · 6h 7m · 16:14–01:21 (January 12, 2027) localAxel-exclusive $319 · Save $18$337Customer link — share with the traveler · See flights for these dates
Atlanta (ATL)Ontario (ONT)Jan 7–10, 2027 · 3 daysOut: Frontier Airlines 3599 / 1261 · 1 stop (DEN) · 7h 19m · 19:56–00:15 (January 8, 2027) local; Return: Frontier Airlines 1358 / 3924 · 1 stop (LAS) · 14h 3m · 14:26–07:29 (January 11, 2027) localAxel-exclusive $257 · Save $15$272Customer link — share with the traveler · See flights for these dates
Atlanta (ATL)Ontario (ONT)Jan 7–10, 2027 · 3 daysOut: Frontier Airlines 3599 / 1261 · 1 stop (DEN) · 7h 19m · 19:56–00:15 (January 8, 2027) local; Return: Frontier Airlines 1500 / 3294 · 1 stop (DEN) · 6h 45m · 06:09–15:54 localAxel-exclusive $339 · Save $19$358Customer link — share with the traveler · See flights for these dates
Seattle (SEA)Ontario (ONT)Jan 8–10, 2027 · 2 daysOut: Alaska Airlines 571 · Nonstop · 2h 34m · 12:59–15:33 local; Return: Alaska Airlines 571 · Nonstop · 2h 50m · 16:29–19:19 localAxel-exclusive $273 · Save $15$287Customer link — share with the traveler · See flights for these dates
Seattle (SEA)Ontario (ONT)Jan 21–24, 2027 · 3 daysOut: Alaska Airlines 571 · Nonstop · 2h 34m · 12:59–15:33 local; Return: Alaska Airlines 571 · Nonstop · 2h 50m · 16:29–19:19 localAxel-exclusive $277 · Save $16$293Customer link — share with the traveler · See flights for these dates

Carry-on bag not confirmed for fares without a carry-on line; check fare details before booking.

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February 2027

1 adult · Economy · Round-trip totals

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FromDestinationTravel datesFlights (out / return)Axel-exclusiveAirline fareNext step
Seattle (SEA)Ontario (ONT)Feb 4–8, 2027 · 4 daysOut: Alaska Airlines 571 · Nonstop · 2h 34m · 12:59–15:33 local; Return: Alaska Airlines 571 · Nonstop · 2h 50m · 16:29–19:19 localAxel-exclusive $273 · Save $15$287Customer link — share with the traveler · See flights for these dates
Dallas (DFW)Ontario (ONT)Feb 12–15, 2027 · 3 daysOut: Frontier Airlines 2549 / 2907 · 1 stop (DEN) · 5h 57m · 06:50–10:47 local; Return: Frontier Airlines 4758 / 1650 · 1 stop (LAS) · 8h 59m · 18:27–05:26 (February 16, 2027) localAxel-exclusive $248 · Save $14$262Customer link — share with the traveler · See flights for these dates
Dallas (DFW)Ontario (ONT)Feb 12–15, 2027 · 3 daysOut: Frontier Airlines 2549 / 2907 · 1 stop (DEN) · 5h 57m · 06:50–10:47 local; Return: Frontier Airlines 1406 · Nonstop · 3h 0m · 19:10–00:10 (February 16, 2027) localAxel-exclusive $319 · Save $18$337Customer link — share with the traveler · See flights for these dates
New York (JFK)Ontario (ONT)Feb 12–15, 2027 · 3 daysOut: Alaska Airlines 19 / 2178 · 1 stop (PDX) · 10h 14m · 16:45–23:59 local; Return: Alaska Airlines 532 / 34 · 1 stop (SEA) · 13h 55m · 06:00–22:55 localAxel-exclusive $711 · Save $37$748Customer link — share with the traveler · See flights for these dates
New York (JFK)Ontario (ONT)Feb 12–15, 2027 · 3 daysOut: Alaska Airlines 19 / 2178 · 1 stop (PDX) · 10h 14m · 16:45–23:59 local; Return: Alaska Airlines 2179 / 18 · 1 stop (PDX) · 8h 50m · 07:30–19:20 localAxel-exclusive $776 · Save $43$819Customer link — share with the traveler · See flights for these dates
Seattle (SEA)Ontario (ONT)Feb 12–14, 2027 · 2 daysOut: Frontier Airlines 1916 / 1261 · 1 stop (DEN) · 7h 36m · 16:29–00:05 (February 13, 2027) local; Return: Frontier Airlines 4758 / 4203 · 1 stop (LAS) · 22h 51m · 18:27–17:18 (February 15, 2027) localAxel-exclusive $257 · Save $15$272Customer link — share with the traveler · See flights for these dates

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March 2027

2 adults · Economy · Round-trip totals

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FromDestinationTravel datesFlights (out / return)Axel-exclusiveAirline fareNext step
Dulles (IAD)Ontario (ONT)Mar 6–9, 2027 · 3 daysOut: Delta Air Lines 1121 / 665 · 1 stop (ATL) · 8h 54m · 06:00–11:54 local; Return: Delta Air Lines 1224 / 847 · 1 stop (SLC) · 7h 46m · 13:00–23:46 localAxel-exclusive $702 · Save $39$741Customer link — share with the traveler · See flights for these dates
Seattle (SEA)Ontario (ONT)Mar 18–22, 2027 · 4 daysOut: Delta Air Lines 3884 · Nonstop · 2h 48m · 19:55–22:43 local; Return: Delta Air Lines 4031 · Nonstop · 3h 3m · 17:47–20:50 localAxel-exclusive $808 · Save $46$854Customer link — share with the traveler · See flights for these dates
Seattle (SEA)Ontario (ONT)Mar 18–21, 2027 · 3 daysOut: Delta Air Lines 3884 · Nonstop · 2h 48m · 19:55–22:43 local; Return: Delta Air Lines 3816 · Nonstop · 3h 5m · 07:00–10:05 localAxel-exclusive $829 · Save $47$876Customer link — share with the traveler · See flights for these dates

1 adult · Economy · Round-trip totals

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FromDestinationTravel datesFlights (out / return)Axel-exclusiveAirline fareNext step
Dallas (DFW)Ontario (ONT)Mar 12–15, 2027 · 3 daysOut: Frontier Airlines 4689 · Nonstop · 3h 17m · 16:58–18:15 local; Return: Frontier Airlines 4758 / 1650 · 1 stop (LAS) · 8h 59m · 18:27–05:26 (March 16, 2027) localAxel-exclusive $310 · Save $18$328Customer link — share with the traveler · See flights for these dates
Dallas (DFW)Ontario (ONT)Mar 12–15, 2027 · 3 daysOut: Frontier Airlines 4689 · Nonstop · 3h 17m · 16:58–18:15 local; Return: Frontier Airlines 1406 · Nonstop · 3h 0m · 19:10–00:10 (March 16, 2027) localAxel-exclusive $339 · Save $19$358Customer link — share with the traveler · See flights for these dates
Denver (DEN)Ontario (ONT)Mar 19–22, 2027 · 3 daysOut: United Airlines 430 · Nonstop · 2h 27m · 11:15–12:42 local; Return: United Airlines 1263 · Nonstop · 2h 19m · 13:00–16:19 localAxel-exclusive $513 · Save $28$541Customer link — share with the traveler · See flights for these dates

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April 2027

1 adult · Economy · Round-trip totals

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FromDestinationTravel datesFlights (out / return)Axel-exclusiveAirline fareNext step
Dallas (DFW)Ontario (ONT)Apr 9–12, 2027 · 3 daysOut: American Airlines 711 · Nonstop · 3h 11m · 22:35–23:46 local; Return: American Airlines 2161 · Nonstop · 2h 53m · 23:59–04:52 (April 13, 2027) localAxel-exclusive $473 · Save $26$499Customer link — share with the traveler · See flights for these dates

4 adults · 1 child · Economy · Round-trip totals

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FromDestinationTravel datesFlights (out / return)Axel-exclusiveAirline fareNext step
Seattle (SEA)Ontario (ONT)Apr 3–9, 2027 · 6 daysOut: Alaska Airlines 378 · Nonstop · 2h 44m · 19:55–22:39 local; Return: Alaska Airlines 532 · Nonstop · 2h 44m · 06:00–08:44 localAxel-exclusive $1,390 · Save $74$1,464Customer link — share with the traveler · See flights for these dates

5 adults · Economy · Round-trip totals

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FromDestinationTravel datesFlights (out / return)Axel-exclusiveAirline fareNext step
Seattle (SEA)Ontario (ONT)Apr 3–9, 2027 · 6 daysOut: Alaska Airlines 378 · Nonstop · 2h 44m · 19:55–22:39 local; Return: Alaska Airlines 532 · Nonstop · 2h 44m · 06:00–08:44 localAxel-exclusive $1,390 · Save $74$1,464Customer link — share with the traveler · See flights for these dates

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June 2027

2 adults · Economy · One-way totals

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FromDestinationTravel datesOutbound flightAxel-exclusiveAirline fareNext step
Denver (DEN)Ontario (ONT)Jun 3, 2027Out: United Airlines 215 · Nonstop · 2h 15m · 19:05–20:20 localAxel-exclusive $523 · Save $28$551Customer link — share with the traveler · See flights for these dates
Denver (DEN)Ontario (ONT)Jun 4, 2027Out: United Airlines 215 · Nonstop · 2h 15m · 19:05–20:20 localAxel-exclusive $523 · Save $28$551Customer link — share with the traveler · See flights for these dates

1 adult · Economy · Round-trip totals

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FromDestinationTravel datesFlights (out / return)Axel-exclusiveAirline fareNext step
Chicago (ORD)Ontario (ONT)Jun 16–22, 2027 · 6 daysOut: United Airlines 2285 · Nonstop · 4h 26m · 20:05–22:31 local; Return: American Airlines 1219 · Nonstop · 4h 15m · 06:00–12:15 localAxel-exclusive $336 · Save $18$354Customer link — share with the traveler · See flights for these dates

4 adults · 1 child · Economy · One-way totals

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FromDestinationTravel datesOutbound flightAxel-exclusiveAirline fareNext step
Seattle (SEA)Ontario (ONT)Jun 5, 2027Out: Southwest Airlines 3600 / 2445 · 1 stop (SMF) · 4h 0m · 11:55–15:55 localAxel-exclusive $1,035 · Save $56$1,091Customer link — share with the traveler · See flights for these dates
Seattle (SEA)Ontario (ONT)Jun 5, 2027Out: Alaska Airlines 1465 · Nonstop · 2h 42m · 08:32–11:14 localAxel-exclusive $1,130 · Save $62$1,192Customer link — share with the traveler · See flights for these dates
Seattle (SEA)Ontario (ONT)Jun 9, 2027Out: Alaska Airlines 441 / 2339 · 1 stop (BOI) · 5h 11m · 12:31–17:42 localAxel-exclusive $985 · Save $56$1,041Customer link — share with the traveler · See flights for these dates
Seattle (SEA)Ontario (ONT)Jun 9, 2027Out: Alaska Airlines 1465 · Nonstop · 2h 42m · 08:32–11:14 localAxel-exclusive $1,130 · Save $62$1,192Customer link — share with the traveler · See flights for these dates

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July 2027

4 adults · 1 child · Economy · One-way totals

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FromDestinationTravel datesOutbound flightAxel-exclusiveAirline fareNext step
Seattle (SEA)Ontario (ONT)Jul 10, 2027Out: Southwest Airlines 3599 / 3144 · 1 stop (SMF) · 4h 20m · 05:00–09:20 localAxel-exclusive $1,035 · Save $56$1,091Customer link — share with the traveler · See flights for these dates

1 adult · Economy · Round-trip starting totals

FromDestinationTravel datesOutbound flightAxel-exclusiveAirline fareNext step
Seattle (SEA)Ontario (ONT)Jul 10–11, 2027 · 1 daysOut: Delta Air Lines 4031 · Nonstop · 2h 42m · 14:35–17:17 localAxel-exclusive From $394 · Save $23From $417See flights for these dates

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  • This page: Flights to Ontario (ONT): deals from 12 cities. Flights to Ontario (ONT) from Seattle, New York, San Francisco Bay Area, Miami or Fort Lauderdale, Chicago, Denver, Minneapolis, Houston, Washington, DC, Dallas-Fort Worth, London, Atlanta. Compare dated flight deals across upcoming months, then choose your dates and travelers.
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