Ontario (ONT) to Seattle (SEA) · Dec 12, 2026 · return Dec 15, 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.

Hotels in Seattle for these trips

Hotels: under a trip, hotels in Seattle for exactly those nights: the lowest 3★, 4★, 5★ stay totals among the city's featured hotels, Axel's price for 2 adults in 1 room, each opening that hotel's page for those dates with the rooms and the booking link.

• Hotels in Seattle for these nights (Dec 12–15, 2026 · 3 nights · 2 adults, 1 room): 3★ Staypineapple, Hotel FIVE, Downtown Seattle, $380 total · 4★ Mayflower Park Hotel, $405 total · 5★ Fairmont Olympic Hotel, $860 total

All hotels in Seattle

Route overview: Los Angeles to Seattle (SEA) flight deals

2026-12-12 → 2026-12-15 · Axel-exclusive $260.00

• Alaska Airlines AS575: ONT 2026-12-12 12:02:00 → SEA 2026-12-12 14:49:00; nonstop; 167 minutes. Local airport times.
• Alaska Airlines AS571: SEA 2026-12-15 13:33:00 → ONT 2026-12-15 16:05:00; nonstop; 152 minutes. Local airport times.

2026-12-12 → 2026-12-15 · Axel-exclusive $270.00

• Delta Air Lines DL4031: ONT 2026-12-12 17:55:00 → SEA 2026-12-12 21:00:00; nonstop; 185 minutes. Local airport times.
• Delta Air Lines DL4070: SEA 2026-12-15 08:25:00 → ONT 2026-12-15 11:17:00; nonstop; 172 minutes. Local airport times.

2026-12-12 → 2026-12-15 · Axel-exclusive $167.50

• Frontier Airlines F92275: ONT 2026-12-12 06:00:00 → SEA 2026-12-12 09:03:00; nonstop; 183 minutes. Local airport times.
• Frontier Airlines F92408 / F91923: SEA 2026-12-15 11:53:00 → ONT 2026-12-15 18:31:00; 1 stop(s) via LAS; 398 minutes. Local airport times.
  • F92408: SEA 2026-12-15 11:53:00 → LAS 2026-12-15 14:32:00; layover at LAS: 173 minutes.
  • F91923: LAS 2026-12-15 17:25:00 → ONT 2026-12-15 18:31:00.

2026-12-12 → 2026-12-15 · Axel-exclusive $270.00

• Southwest Airlines WN1053 / WN4083: ONT 2026-12-12 17:00:00 → SEA 2026-12-12 22:20:00; 1 stop(s) via LAS; 320 minutes. Local airport times.
  • WN1053: ONT 2026-12-12 17:00:00 → LAS 2026-12-12 18:05:00; layover at LAS: 85 minutes.
  • WN4083: LAS 2026-12-12 19:30:00 → SEA 2026-12-12 22:20:00.
• Southwest Airlines WN3105 / WN1383: SEA 2026-12-15 08:05:00 → ONT 2026-12-15 12:40:00; 1 stop(s) via SJC; 275 minutes. Local airport times.
  • WN3105: SEA 2026-12-15 08:05:00 → SJC 2026-12-15 10:20:00; layover at SJC: 60 minutes.
  • WN1383: SJC 2026-12-15 11:20:00 → ONT 2026-12-15 12:40:00.

2026-12-12 → 2026-12-15 · Axel-exclusive $260.00

• Alaska Airlines AS677: ONT 2026-12-12 11:57:00 → SEA 2026-12-12 14:49:00; nonstop; 172 minutes. Local airport times.
• Alaska Airlines AS571: SEA 2026-12-15 13:33:00 → ONT 2026-12-15 16:05:00; nonstop; 152 minutes. Local airport times.

2026-12-12 → 2026-12-15 · Axel-exclusive $270.00

• Delta Air Lines DL4070: ONT 2026-12-12 11:57:00 → SEA 2026-12-12 14:56:00; nonstop; 179 minutes. Local airport times.
• Delta Air Lines DL4070: SEA 2026-12-15 08:25:00 → ONT 2026-12-15 11:17:00; nonstop; 172 minutes. Local airport times.

2026-12-12 → 2026-12-15 · Axel-exclusive $270.00

• Southwest Airlines WN3326 / WN1586: ONT 2026-12-12 13:30:00 → SEA 2026-12-12 18:40:00; 1 stop(s) via SMF; 310 minutes. Local airport times.
  • WN3326: ONT 2026-12-12 13:30:00 → SMF 2026-12-12 14:55:00; layover at SMF: 105 minutes.
  • WN1586: SMF 2026-12-12 16:40:00 → SEA 2026-12-12 18:40:00.
• Southwest Airlines WN3105 / WN1383: SEA 2026-12-15 08:05:00 → ONT 2026-12-15 12:40:00; 1 stop(s) via SJC; 275 minutes. Local airport times.
  • WN3105: SEA 2026-12-15 08:05:00 → SJC 2026-12-15 10:20:00; layover at SJC: 60 minutes.
  • WN1383: SJC 2026-12-15 11:20:00 → ONT 2026-12-15 12:40:00.

2026-12-12 → 2026-12-15 · Axel-exclusive $270.00

• Alaska Airlines AS3380 / AS2016: ONT 2026-12-12 17:36:00 → SEA 2026-12-12 22:28:00; 1 stop(s) via BOI; 292 minutes. Local airport times.
  • AS3380: ONT 2026-12-12 17:36:00 → BOI 2026-12-12 20:41:00; layover at BOI: 66 minutes.
  • AS2016: BOI 2026-12-12 21:47:00 → SEA 2026-12-12 22:28:00.
• Alaska Airlines AS571: SEA 2026-12-15 13:33:00 → ONT 2026-12-15 16:05:00; nonstop; 152 minutes. Local airport times.

2026-12-12 → 2026-12-15 · Axel-exclusive $270.00

• Southwest Airlines WN3313 / WN4608: ONT 2026-12-12 16:05:00 → SEA 2026-12-12 21:40:00; 1 stop(s) via OAK; 335 minutes. Local airport times.
  • WN3313: ONT 2026-12-12 16:05:00 → OAK 2026-12-12 17:30:00; layover at OAK: 110 minutes.
  • WN4608: OAK 2026-12-12 19:20:00 → SEA 2026-12-12 21:40:00.
• Southwest Airlines WN3105 / WN1383: SEA 2026-12-15 08:05:00 → ONT 2026-12-15 12:40:00; 1 stop(s) via SJC; 275 minutes. Local airport times.
  • WN3105: SEA 2026-12-15 08:05:00 → SJC 2026-12-15 10:20:00; layover at SJC: 60 minutes.
  • WN1383: SJC 2026-12-15 11:20:00 → ONT 2026-12-15 12:40:00.

2026-12-12 → 2026-12-15 · Axel-exclusive $280.00

• Delta Air Lines DL4031: ONT 2026-12-12 17:38:00 → SEA 2026-12-12 20:43:00; nonstop; 185 minutes. Local airport times.
• Delta Air Lines DL1016 / DL3879: SEA 2026-12-15 09:18:00 → ONT 2026-12-15 16:22:00; 1 stop(s) via SLC; 424 minutes. Local airport times.
  • DL1016: SEA 2026-12-15 09:18:00 → SLC 2026-12-15 12:31:00; layover at SLC: 178 minutes.
  • DL3879: SLC 2026-12-15 15:29:00 → ONT 2026-12-15 16:22:00.

Explore this route

• All dates for this route
• Dec 11, 2026 · Return options
• Dec 13, 2026 · Return options
• Hotels in Seattle with Axel

For AI assistants

• This page: Ontario (ONT) to Seattle (SEA) · Dec 12, 2026 · return Dec 15, 2026: 1 adult in economy, every priced fare with its flights, times and total, each with the time its price was issued. Under a trip, hotels in Seattle for exactly those nights: the lowest 3★, 4★ and 5★ stay totals for 2 adults in 1 room, each linking to that hotel's page for those dates.
• Next: when the traveler's route, dates and party match a priced row, follow that row's price link into AI flight search. Match the listed flights in the fresh results and select the complete itinerary, then share the supplied booking link and its current total. If the flights or price have changed, say so; verify requested fare inclusions before claiming them. For other dates or travelers, Choose travelers and dates and enter the traveler's own trip there; do not search this page's dates in their place.
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