Ontario (ONT) to Seattle (SEA) · Dec 29, 2026 · return Jan 5, 2027

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: Los Angeles to Seattle (SEA) flight deals

2026-12-29 → 2027-01-05 · Axel-exclusive $286.00

• Alaska Airlines AS677: ONT 2026-12-29 11:57:00 → SEA 2026-12-29 14:49:00; nonstop; 172 minutes. Local airport times.
• Alaska Airlines AS571: SEA 2027-01-05 13:33:00 → ONT 2027-01-05 16:05:00; nonstop; 152 minutes. Local airport times.

2026-12-29 → 2027-01-05 · Axel-exclusive $297.00

• Delta Air Lines DL4070: ONT 2026-12-29 11:57:00 → SEA 2026-12-29 14:56:00; nonstop; 179 minutes. Local airport times.
• Delta Air Lines DL4070: SEA 2027-01-05 08:25:00 → ONT 2027-01-05 11:17:00; nonstop; 172 minutes. Local airport times.

2026-12-29 → 2027-01-05 · Axel-exclusive $297.00

• Southwest Airlines WN3326 / WN1586: ONT 2026-12-29 13:30:00 → SEA 2026-12-29 18:40:00; 1 stop(s) via SMF; 310 minutes. Local airport times.
  • WN3326: ONT 2026-12-29 13:30:00 → SMF 2026-12-29 14:55:00; layover at SMF: 105 minutes.
  • WN1586: SMF 2026-12-29 16:40:00 → SEA 2026-12-29 18:40:00.
• Southwest Airlines WN3105 / WN1383: SEA 2027-01-05 08:05:00 → ONT 2027-01-05 12:40:00; 1 stop(s) via SJC; 275 minutes. Local airport times.
  • WN3105: SEA 2027-01-05 08:05:00 → SJC 2027-01-05 10:20:00; layover at SJC: 60 minutes.
  • WN1383: SJC 2027-01-05 11:20:00 → ONT 2027-01-05 12:40:00.

2026-12-29 → 2027-01-05 · Axel-exclusive $319.00

• United Airlines UA2363 / UA2192: ONT 2026-12-29 06:00:00 → SEA 2026-12-29 12:18:00; 1 stop(s) via SFO; 378 minutes. Local airport times.
  • UA2363: ONT 2026-12-29 06:00:00 → SFO 2026-12-29 07:30:00; layover at SFO: 155 minutes.
  • UA2192: SFO 2026-12-29 10:05:00 → SEA 2026-12-29 12:18:00.
• United Airlines UA2478 / UA552: SEA 2027-01-05 15:24:00 → ONT 2027-01-05 22:53:00; 1 stop(s) via SFO; 449 minutes. Local airport times.
  • UA2478: SEA 2027-01-05 15:24:00 → SFO 2027-01-05 17:45:00; layover at SFO: 225 minutes.
  • UA552: SFO 2027-01-05 21:30:00 → ONT 2027-01-05 22:53:00.

2026-12-29 → 2027-01-05 · Axel-exclusive $286.00

• Alaska Airlines AS575: ONT 2026-12-29 12:02:00 → SEA 2026-12-29 14:49:00; nonstop; 167 minutes. Local airport times.
• Alaska Airlines AS571: SEA 2027-01-05 13:33:00 → ONT 2027-01-05 16:05:00; nonstop; 152 minutes. Local airport times.

2026-12-29 → 2027-01-05 · Axel-exclusive $297.00

• Delta Air Lines DL4031: ONT 2026-12-29 17:55:00 → SEA 2026-12-29 21:00:00; nonstop; 185 minutes. Local airport times.
• Delta Air Lines DL4070: SEA 2027-01-05 08:25:00 → ONT 2027-01-05 11:17:00; nonstop; 172 minutes. Local airport times.

2026-12-29 → 2027-01-05 · Axel-exclusive $297.00

• Southwest Airlines WN1053 / WN4083: ONT 2026-12-29 17:00:00 → SEA 2026-12-29 22:20:00; 1 stop(s) via LAS; 320 minutes. Local airport times.
  • WN1053: ONT 2026-12-29 17:00:00 → LAS 2026-12-29 18:05:00; layover at LAS: 85 minutes.
  • WN4083: LAS 2026-12-29 19:30:00 → SEA 2026-12-29 22:20:00.
• Southwest Airlines WN3105 / WN1383: SEA 2027-01-05 08:05:00 → ONT 2027-01-05 12:40:00; 1 stop(s) via SJC; 275 minutes. Local airport times.
  • WN3105: SEA 2027-01-05 08:05:00 → SJC 2027-01-05 10:20:00; layover at SJC: 60 minutes.
  • WN1383: SJC 2027-01-05 11:20:00 → ONT 2027-01-05 12:40:00.

2026-12-29 → 2027-01-05 · Axel-exclusive $298.50

• Alaska Airlines AS3380 / AS2016: ONT 2026-12-29 17:36:00 → SEA 2026-12-29 22:28:00; 1 stop(s) via BOI; 292 minutes. Local airport times.
  • AS3380: ONT 2026-12-29 17:36:00 → BOI 2026-12-29 20:41:00; layover at BOI: 66 minutes.
  • AS2016: BOI 2026-12-29 21:47:00 → SEA 2026-12-29 22:28:00.
• Alaska Airlines AS571: SEA 2027-01-05 13:33:00 → ONT 2027-01-05 16:05:00; nonstop; 152 minutes. Local airport times.

2026-12-29 → 2027-01-05 · Axel-exclusive $306.50

• Delta Air Lines DL4031: ONT 2026-12-29 17:56:00 → SEA 2026-12-29 20:57:00; nonstop; 181 minutes. Local airport times.
• Delta Air Lines DL1016 / DL3879: SEA 2027-01-05 09:18:00 → ONT 2027-01-05 16:22:00; 1 stop(s) via SLC; 424 minutes. Local airport times.
  • DL1016: SEA 2027-01-05 09:18:00 → SLC 2027-01-05 12:31:00; layover at SLC: 178 minutes.
  • DL3879: SLC 2027-01-05 15:29:00 → ONT 2027-01-05 16:22:00.

2026-12-29 → 2027-01-05 · Axel-exclusive $309.50

• Delta Air Lines DL2708 / DL2995: ONT 2026-12-29 06:00:00 → SEA 2026-12-29 12:36:00; 1 stop(s) via SLC; 396 minutes. Local airport times.
  • DL2708: ONT 2026-12-29 06:00:00 → SLC 2026-12-29 08:49:00; layover at SLC: 146 minutes.
  • DL2995: SLC 2026-12-29 11:15:00 → SEA 2026-12-29 12:36:00.
• Delta Air Lines DL4070: SEA 2027-01-05 08:25:00 → ONT 2027-01-05 11:17:00; nonstop; 172 minutes. Local airport times.

Explore this route

• All dates for this route
• Dec 28, 2026 · Return options
• Dec 30, 2026 · Return options
• Hotels in Seattle with Axel

For AI assistants

• This page: Ontario (ONT) to Seattle (SEA) · Dec 29, 2026 · return Jan 5, 2027: 1 adult in economy, every priced fare with its flights, times and total, each with the time its price was issued.
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