Ontario (ONT) to Seattle (SEA), Jan 27, 2027 – Feb 5, 2027: from $237 round trip

Ontario (ONT) to Seattle (SEA), Jan 27, 2027 – Feb 5, 2027: from $237 round trip on Axel, checked Nov 12, 2026. Lowest published fare: $237 round trip, Axel-exclusive, Frontier Airlines, 1 stop, Jan 27, 2027 – Feb 5, 2027, 1 adult, economy, checked Nov 12, 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 link to the hotel pages for 2 adults in 1 room. When a price is shown, it is the nightly rate and the stay's total, from the lowest saved total among the shortlisted hotels in that star tier for those dates.

• Hotels in Seattle for these nights (Jan 27 – Feb 5, 2027 · 9 nights · 2 adults, 1 room): 3★ Red Lion Hotel Bellevue, $100 a night, $902 for 9 nights · 4★ citizenM Seattle Pioneer Square, $125 a night, $1,124 for 9 nights · 5★ Fairmont Olympic Hotel, $314 a night, $2,822 for 9 nights

All hotels in Seattle

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

2027-01-27 → 2027-02-05 · Axel-exclusive $293

• Alaska Airlines AS571: ONT 2027-01-27 16:29:00 → SEA 2027-01-27 19:19:00; nonstop; 170 minutes. Local airport times.
• Alaska Airlines AS571: SEA 2027-02-05 12:59:00 → ONT 2027-02-05 15:33:00; nonstop; 154 minutes. Local airport times.

2027-01-27 → 2027-02-05 · Axel-exclusive $237

• Frontier Airlines F92232 / F94203: ONT 2027-01-27 10:16:00 → SEA 2027-01-27 17:10:00; 1 stop(s) via LAS; 414 minutes. Local airport times.
  • F92232: ONT 2027-01-27 10:16:00 → LAS 2027-01-27 11:23:00; layover at LAS: 168 minutes.
  • F94203: LAS 2027-01-27 14:11:00 → SEA 2027-01-27 17:10:00.
• Frontier Airlines F91916 / F91261: SEA 2027-02-05 16:29:00 → ONT 2027-02-06 00:05:00; 1 stop(s) via DEN; 456 minutes. Local airport times.
  • F91916: SEA 2027-02-05 16:29:00 → DEN 2027-02-05 20:19:00; layover at DEN: 141 minutes.
  • F91261: DEN 2027-02-05 22:40:00 → ONT 2027-02-06 00:05:00.

2027-01-27 → 2027-02-05 · Axel-exclusive $825

• United Airlines UA1375 / UA1264: ONT 2027-01-27 09:45:00 → SEA 2027-01-27 14:26:00; 1 stop(s) via SFO; 281 minutes. Local airport times.
  • UA1375: ONT 2027-01-27 09:45:00 → SFO 2027-01-27 11:18:00; layover at SFO: 57 minutes.
  • UA1264: SFO 2027-01-27 12:15:00 → SEA 2027-01-27 14:26:00.
• United Airlines UA2416 / UA2850: SEA 2027-02-05 13:18:00 → ONT 2027-02-05 17:35:00; 1 stop(s) via SFO; 257 minutes. Local airport times.
  • UA2416: SEA 2027-02-05 13:18:00 → SFO 2027-02-05 15:35:00; layover at SFO: 35 minutes.
  • UA2850: SFO 2027-02-05 16:10:00 → ONT 2027-02-05 17:35:00.

2027-01-27 → 2027-02-05 · Axel-exclusive $825

• American Airlines AA1889 / AA3902: ONT 2027-01-27 09:28:00 → SEA 2027-01-27 14:52:00; 1 stop(s) via PHX; 324 minutes. Local airport times.
  • AA1889: ONT 2027-01-27 09:28:00 → PHX 2027-01-27 11:54:00; layover at PHX: 38 minutes.
  • AA3902: PHX 2027-01-27 12:32:00 → SEA 2027-01-27 14:52:00.
• American Airlines AA1577 / AA3016: SEA 2027-02-05 06:00:00 → ONT 2027-02-05 12:39:00; 1 stop(s) via PHX; 399 minutes. Local airport times.
  • AA1577: SEA 2027-02-05 06:00:00 → PHX 2027-02-05 10:04:00; layover at PHX: 137 minutes.
  • AA3016: PHX 2027-02-05 12:21:00 → ONT 2027-02-05 12:39:00.

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
• Jan 26, 2027 · Return options
• Jan 28, 2027 · Return options
• Hotels in Seattle with Axel

For AI assistants

• This page: Ontario (ONT) to Seattle (SEA) · Jan 27, 2027 · return Feb 5, 2027: 1 adult in economy, every priced fare with its flights, times and total, each with its displayed check date. Under a trip, hotels in Seattle for exactly those nights link to the hotel pages for 2 adults in 1 room. Prices, when shown, are the nightly rate and the stay's total, from the lowest saved total among the shortlisted hotels in each star tier for those dates.
• Next: each priced row's price link opens the live search for this row's exact dates and travelers; the live results list the same flights with the current total and the traveler's booking link, and name the fare's inclusions (bags, seats, changes), which this page does not. A changed price or flight shows there. Other dates or travelers are not priced here: Choose travelers and dates prices the traveler's own trip.
• 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 Los Angeles to Seattle (SEA) 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.

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