Seattle (SEA) to Ontario (ONT) · Nov 21, 2026 · return Nov 25, 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

2026-11-21 → 2026-11-25 · Axel-exclusive $222.76

• Frontier Airlines F92276: SEA 2026-11-21 10:18:00 → ONT 2026-11-21 13:06:00; nonstop; 168 minutes. Local airport times.
• Frontier Airlines F92275: ONT 2026-11-25 06:00:00 → SEA 2026-11-25 09:03:00; nonstop; 183 minutes. Local airport times.

2026-11-21 → 2026-11-25 · Axel-exclusive $376.66

• Alaska Airlines AS571: SEA 2026-11-21 12:20:00 → ONT 2026-11-21 15:03:00; nonstop; 163 minutes. Local airport times.
• Alaska Airlines AS575: ONT 2026-11-25 12:02:00 → SEA 2026-11-25 14:49:00; nonstop; 167 minutes. Local airport times.

2026-11-21 → 2026-11-25 · Axel-exclusive $390.16

• Delta Air Lines DL4070: SEA 2026-11-21 08:25:00 → ONT 2026-11-21 11:17:00; nonstop; 172 minutes. Local airport times.
• Delta Air Lines DL4031: ONT 2026-11-25 17:56:00 → SEA 2026-11-25 20:57:00; nonstop; 181 minutes. Local airport times.

2026-11-21 → 2026-11-25 · Axel-exclusive $430.66

• Southwest Airlines WN3105 / WN1383: SEA 2026-11-21 08:05:00 → ONT 2026-11-21 12:40:00; 1 stop(s) via SJC; 275 minutes. Local airport times.
  • WN3105: SEA 2026-11-21 08:05:00 → SJC 2026-11-21 10:20:00; layover at SJC: 60 minutes.
  • WN1383: SJC 2026-11-21 11:20:00 → ONT 2026-11-21 12:40:00.
• Southwest Airlines WN3313 / WN4608: ONT 2026-11-25 16:05:00 → SEA 2026-11-25 21:40:00; 1 stop(s) via OAK; 335 minutes. Local airport times.
  • WN3313: ONT 2026-11-25 16:05:00 → OAK 2026-11-25 17:30:00; layover at OAK: 110 minutes.
  • WN4608: OAK 2026-11-25 19:20:00 → SEA 2026-11-25 21:40:00.

2026-11-21 → 2026-11-25 · Axel-exclusive $481.96

• American Airlines AA2073 / AA1841: SEA 2026-11-21 15:00:00 → ONT 2026-11-21 21:52:00; 1 stop(s) via PHX; 412 minutes. Local airport times.
  • AA2073: SEA 2026-11-21 15:00:00 → PHX 2026-11-21 18:52:00; layover at PHX: 163 minutes.
  • AA1841: PHX 2026-11-21 21:35:00 → ONT 2026-11-21 21:52:00.
• United Airlines UA2363 / UA2192: ONT 2026-11-25 06:00:00 → SEA 2026-11-25 12:18:00; 1 stop(s) via SFO; 378 minutes. Local airport times.
  • UA2363: ONT 2026-11-25 06:00:00 → SFO 2026-11-25 07:30:00; layover at SFO: 155 minutes.
  • UA2192: SFO 2026-11-25 10:05:00 → SEA 2026-11-25 12:18:00.

2026-11-21 → 2026-11-25 · Axel-exclusive $484.66

• United Airlines UA2478 / UA552: SEA 2026-11-21 15:24:00 → ONT 2026-11-21 22:53:00; 1 stop(s) via SFO; 449 minutes. Local airport times.
  • UA2478: SEA 2026-11-21 15:24:00 → SFO 2026-11-21 17:45:00; layover at SFO: 225 minutes.
  • UA552: SFO 2026-11-21 21:30:00 → ONT 2026-11-21 22:53:00.
• United Airlines UA2363 / UA2192: ONT 2026-11-25 06:00:00 → SEA 2026-11-25 12:18:00; 1 stop(s) via SFO; 378 minutes. Local airport times.
  • UA2363: ONT 2026-11-25 06:00:00 → SFO 2026-11-25 07:30:00; layover at SFO: 155 minutes.
  • UA2192: SFO 2026-11-25 10:05:00 → SEA 2026-11-25 12:18:00.

2026-11-21 → 2026-11-25 · Axel-exclusive $376.66

• Alaska Airlines AS489: SEA 2026-11-21 21:23:00 → ONT 2026-11-21 23:59:00; nonstop; 156 minutes. Local airport times.
• Alaska Airlines AS575: ONT 2026-11-25 12:02:00 → SEA 2026-11-25 14:49:00; nonstop; 167 minutes. Local airport times.

2026-11-21 → 2026-11-25 · Axel-exclusive $353.71

• Frontier Airlines F92276: SEA 2026-11-21 10:50:00 → ONT 2026-11-21 13:38:00; nonstop; 168 minutes. Local airport times.
• United Airlines UA2363 / UA2192: ONT 2026-11-25 06:00:00 → SEA 2026-11-25 12:18:00; 1 stop(s) via SFO; 378 minutes. Local airport times.
  • UA2363: ONT 2026-11-25 06:00:00 → SFO 2026-11-25 07:30:00; layover at SFO: 155 minutes.
  • UA2192: SFO 2026-11-25 10:05:00 → SEA 2026-11-25 12:18:00.

2026-11-21 → 2026-11-25 · Axel-exclusive $414.46

• Alaska Airlines AS3087 / AS3380: SEA 2026-11-21 09:50:00 → ONT 2026-11-21 16:56:00; 1 stop(s) via BOI; 426 minutes. Local airport times.
  • AS3087: SEA 2026-11-21 09:50:00 → BOI 2026-11-21 12:21:00; layover at BOI: 199 minutes.
  • AS3380: BOI 2026-11-21 15:40:00 → ONT 2026-11-21 16:56:00.
• Alaska Airlines AS575: ONT 2026-11-25 12:02:00 → SEA 2026-11-25 14:49:00; nonstop; 167 minutes. Local airport times.

2026-11-21 → 2026-11-25 · Axel-exclusive $427.96

• Delta Air Lines DL1016 / DL3879: SEA 2026-11-21 09:18:00 → ONT 2026-11-21 16:22:00; 1 stop(s) via SLC; 424 minutes. Local airport times.
  • DL1016: SEA 2026-11-21 09:18:00 → SLC 2026-11-21 12:31:00; layover at SLC: 178 minutes.
  • DL3879: SLC 2026-11-21 15:29:00 → ONT 2026-11-21 16:22:00.
• Delta Air Lines DL4031: ONT 2026-11-25 17:56:00 → SEA 2026-11-25 20:57:00; nonstop; 181 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 20, 2026 · Return options
• Nov 22, 2026 · Return options

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