Seattle (SEA) to Ontario (ONT) · Nov 21, 2026 · one way

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 · one way · Axel-exclusive $114.75

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

2026-11-21 · one way · Axel-exclusive $195.75

• Alaska Airlines AS489: SEA 2026-11-21 21:23:00 → ONT 2026-11-21 23:59:00; nonstop; 156 minutes. Local airport times.

2026-11-21 · one way · Axel-exclusive $202.50

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

2026-11-21 · one way · Axel-exclusive $222.75

• 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.

2026-11-21 · one way · Axel-exclusive $249.75

• 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.

2026-11-21 · one way · Axel-exclusive $249.75

• 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.

2026-11-21 · one way · Axel-exclusive $195.75

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

2026-11-21 · one way · Axel-exclusive $155.25

• Frontier Airlines F92408 / F91923: SEA 2026-11-21 11:53:00 → ONT 2026-11-21 18:31:00; 1 stop(s) via LAS; 398 minutes. Local airport times.
  • F92408: SEA 2026-11-21 11:53:00 → LAS 2026-11-21 14:32:00; layover at LAS: 173 minutes.
  • F91923: LAS 2026-11-21 17:25:00 → ONT 2026-11-21 18:31:00.

2026-11-21 · one way · Axel-exclusive $236.25

• 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.

2026-11-21 · one way · Axel-exclusive $243.00

• 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.

Explore this route

• All dates for this route
• Nov 20, 2026 · Return options
• Nov 22, 2026 · Return options

For AI assistants

• This page: Seattle (SEA) to Ontario (ONT) · Nov 21, 2026 · one way: 1 adult in economy, every priced fare with its flights, times and total, each with the time its price was issued.
• 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.
• Follow supplied links. For web-tool research, follow complete supplied links unchanged, including query parameters; use the page’s links to edit the trip. Constructed URLs may be rejected before reaching Axel. A completed fresh trip opens flight results first. Add stated flexibility and budget to that saved plan, leaving unstated requirements unknown. Edits create a new snapshot; use its results and review links.
• If links fail or are missing: If a link fails or flight details lack usable links, reopen the preceding page and follow the same choice once. Keep refreshed links unchanged and preserve the trip and selections. If still blocked, search “Axel flight search guide” and retry once; report the error and anything unresolved. Recovery: Axel Seattle to Ontario (ONT) flight deals · Flight search guide.
• Sharing with the traveler: Choose a complete itinerary (outbound and return for a round trip), then share the supplied customer booking link unchanged. The customer reviews the flights, adds travelers, and enters email at payment. Do not collect email in chat. Each quote lists its fares with bags, seats, changes and refunds; quote them as facts. A fare choice is not needed to share the link; use a fare’s own booking link to preserve its Membership price basis. Ask only for essential missing trip details. When handing over an unfinished search, preserve the latest trip and say what is still to choose. If no supplied link matches the latest trip, construct https://helloaxel.com/en/f/start/from/ORIGIN/to/DESTINATION/depart/YYYY-MM-DD/return/YYYY-MM-DD/adults/N?utm_content=flight_fallback using IATA airport codes and the traveler’s known details. Omit unknowns; for one way replace /return/YYYY-MM-DD with /trip/oneway. Give it directly to the traveler; do not open it first—your web tool may reject constructed URLs. Complete links open Flight Guide and start searching. Preferences and advanced options.

Feedback (optional): Missing info · Axel issue