Seattle (SEA) to Ontario (ONT) · Nov 29, 2026 · return Dec 9, 2026

Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

See flights for these dates: each price link opens AI flight search for that row's exact dates and travelers. Select the complete itinerary there.

Route overview: Seattle to Ontario (ONT) flight deals

2026-11-29 → 2026-12-09 · Axel-exclusive $193.88

• Frontier Airlines F92276: SEA 2026-11-29 10:50:00 → ONT 2026-11-29 13:38:00; nonstop; 168 minutes. Local airport times.
• Frontier Airlines F92275: ONT 2026-12-09 06:00:00 → SEA 2026-12-09 09:03:00; nonstop; 183 minutes. Local airport times.

2026-11-29 → 2026-12-09 · Axel-exclusive $327.83

• Alaska Airlines AS575: SEA 2026-11-29 08:34:00 → ONT 2026-11-29 11:18:00; nonstop; 164 minutes. Local airport times.
• Alaska Airlines AS677: ONT 2026-12-09 11:57:00 → SEA 2026-12-09 14:49:00; nonstop; 172 minutes. Local airport times.

2026-11-29 → 2026-12-09 · Axel-exclusive $339.58

• Delta Air Lines DL4070: SEA 2026-11-29 08:25:00 → ONT 2026-11-29 11:17:00; nonstop; 172 minutes. Local airport times.
• Delta Air Lines DL4031: ONT 2026-12-09 17:55:00 → SEA 2026-12-09 21:00:00; nonstop; 185 minutes. Local airport times.

2026-11-29 → 2026-12-09 · Axel-exclusive $374.83

• Southwest Airlines WN3105 / WN1383: SEA 2026-11-29 08:05:00 → ONT 2026-11-29 12:40:00; 1 stop(s) via SJC; 275 minutes. Local airport times.
  • WN3105: SEA 2026-11-29 08:05:00 → SJC 2026-11-29 10:20:00; layover at SJC: 60 minutes.
  • WN1383: SJC 2026-11-29 11:20:00 → ONT 2026-11-29 12:40:00.
• Southwest Airlines WN3326 / WN1586: ONT 2026-12-09 13:30:00 → SEA 2026-12-09 18:40:00; 1 stop(s) via SMF; 310 minutes. Local airport times.
  • WN3326: ONT 2026-12-09 13:30:00 → SMF 2026-12-09 14:55:00; layover at SMF: 105 minutes.
  • WN1586: SMF 2026-12-09 16:40:00 → SEA 2026-12-09 18:40:00.

2026-11-29 → 2026-12-09 · Axel-exclusive $419.13

• American Airlines AA2073 / AA1841: SEA 2026-11-29 15:00:00 → ONT 2026-11-29 21:52:00; 1 stop(s) via PHX; 412 minutes. Local airport times.
  • AA2073: SEA 2026-11-29 15:00:00 → PHX 2026-11-29 18:52:00; layover at PHX: 163 minutes.
  • AA1841: PHX 2026-11-29 21:35:00 → ONT 2026-11-29 21:52:00.
• United Airlines UA2363 / UA2192: ONT 2026-12-09 06:00:00 → SEA 2026-12-09 12:18:00; 1 stop(s) via SFO; 378 minutes. Local airport times.
  • UA2363: ONT 2026-12-09 06:00:00 → SFO 2026-12-09 07:30:00; layover at SFO: 155 minutes.
  • UA2192: SFO 2026-12-09 10:05:00 → SEA 2026-12-09 12:18:00.

2026-11-29 → 2026-12-09 · Axel-exclusive $421.83

• United Airlines UA2478 / UA552: SEA 2026-11-29 15:24:00 → ONT 2026-11-29 22:53:00; 1 stop(s) via SFO; 449 minutes. Local airport times.
  • UA2478: SEA 2026-11-29 15:24:00 → SFO 2026-11-29 17:45:00; layover at SFO: 225 minutes.
  • UA552: SFO 2026-11-29 21:30:00 → ONT 2026-11-29 22:53:00.
• United Airlines UA2363 / UA2192: ONT 2026-12-09 06:00:00 → SEA 2026-12-09 12:18:00; 1 stop(s) via SFO; 378 minutes. Local airport times.
  • UA2363: ONT 2026-12-09 06:00:00 → SFO 2026-12-09 07:30:00; layover at SFO: 155 minutes.
  • UA2192: SFO 2026-12-09 10:05:00 → SEA 2026-12-09 12:18:00.

2026-11-29 → 2026-12-09 · Axel-exclusive $327.83

• Alaska Airlines AS571: SEA 2026-11-29 12:20:00 → ONT 2026-11-29 15:03:00; nonstop; 163 minutes. Local airport times.
• Alaska Airlines AS677: ONT 2026-12-09 11:57:00 → SEA 2026-12-09 14:49:00; nonstop; 172 minutes. Local airport times.

2026-11-29 → 2026-12-09 · Axel-exclusive $290.88

• Frontier Airlines F92276: SEA 2026-11-29 10:18:00 → ONT 2026-11-29 13:06:00; nonstop; 168 minutes. Local airport times.
• United Airlines UA2363 / UA2192: ONT 2026-12-09 06:00:00 → SEA 2026-12-09 12:18:00; 1 stop(s) via SFO; 378 minutes. Local airport times.
  • UA2363: ONT 2026-12-09 06:00:00 → SFO 2026-12-09 07:30:00; layover at SFO: 155 minutes.
  • UA2192: SFO 2026-12-09 10:05:00 → SEA 2026-12-09 12:18:00.

2026-11-29 → 2026-12-09 · Axel-exclusive $365.63

• Alaska Airlines AS3087 / AS3380: SEA 2026-11-29 09:50:00 → ONT 2026-11-29 16:56:00; 1 stop(s) via BOI; 426 minutes. Local airport times.
  • AS3087: SEA 2026-11-29 09:50:00 → BOI 2026-11-29 12:21:00; layover at BOI: 199 minutes.
  • AS3380: BOI 2026-11-29 15:40:00 → ONT 2026-11-29 16:56:00.
• Alaska Airlines AS677: ONT 2026-12-09 11:57:00 → SEA 2026-12-09 14:49:00; nonstop; 172 minutes. Local airport times.

2026-11-29 → 2026-12-09 · Axel-exclusive $377.38

• Delta Air Lines DL1016 / DL3879: SEA 2026-11-29 09:18:00 → ONT 2026-11-29 16:22:00; 1 stop(s) via SLC; 424 minutes. Local airport times.
  • DL1016: SEA 2026-11-29 09:18:00 → SLC 2026-11-29 12:31:00; layover at SLC: 178 minutes.
  • DL3879: SLC 2026-11-29 15:29:00 → ONT 2026-11-29 16:22:00.
• Delta Air Lines DL4031: ONT 2026-12-09 17:55:00 → SEA 2026-12-09 21:00:00; nonstop; 185 minutes. Local airport times.

Travelers: prices on this page are totals for 1 adult. For a different party, open this trip for 2 adults · 3 adults · 4 adults · 2 adults + 1 child · 2 adults + 2 children; each link opens AI flight search for these dates and those travelers, and the customer link to share comes from those results.

Explore this route

• All dates for this route
• Nov 28, 2026 · Return options
• Nov 30, 2026 · Return options

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