Saint Louis (STL) to Seattle (SEA), Dec 16, 2026: round trips from $295, one way from $150

Saint Louis (STL) to Seattle (SEA), Dec 16, 2026: round trips from $295, one way from $150 on Axel, checked Oct 29, 2026. Lowest published fares: $295 round trip, Axel-exclusive, Southwest Airlines, 1 stop, Dec 16–17, 2026; $150 one way, Axel-exclusive, Southwest Airlines, 1 stop, Dec 16, 2026; 1 adult, economy, checked Oct 29, 2026. Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

Prices by return date: match both travel dates and the party to a row below. Each total is for that exact trip, issued at the time shown.

Date links open published trip details for exploration. Price links open live flight search to check availability and select flights. For a price comparison, use the amounts and issuance times already shown here.

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 lowest saved total among the shortlisted hotels in that star tier for those dates.

• Hotels in Seattle for these nights (Dec 16–17, 2026 · 1 night · 2 adults, 1 room): 3★ Red Lion Hotel Bellevue, $75 total · 4★ citizenM Seattle Pioneer Square, $94 total · 5★ Fairmont Olympic Hotel, $300 total
• Hotels in Seattle for these nights (Dec 16–18, 2026 · 2 nights · 2 adults, 1 room): 3★ Red Lion Hotel Bellevue, $153 total · 4★ citizenM Seattle Pioneer Square, $187 total · 5★ Fairmont Olympic Hotel, $574 total
• Hotels in Seattle for these nights (Dec 16–19, 2026 · 3 nights · 2 adults, 1 room): 3★ Red Lion Hotel Bellevue, $232 total · 4★ citizenM Seattle Pioneer Square, $276 total · 5★ Fairmont Olympic Hotel, $857 total
• Hotels in Seattle for these nights (Dec 16–20, 2026 · 4 nights · 2 adults, 1 room): 3★ Red Lion Hotel Bellevue, $313 total · 4★ citizenM Seattle Pioneer Square, $390 total · 5★ Fairmont Olympic Hotel, $1,144 total
• Hotels in Seattle for these nights (Dec 16–21, 2026 · 5 nights · 2 adults, 1 room): 3★ Red Lion Hotel Bellevue, $389 total · 4★ citizenM Seattle Pioneer Square, $500 total · 5★ Fairmont Olympic Hotel, $1,411 total
• Hotels in Seattle for these nights (Dec 16–22, 2026 · 6 nights · 2 adults, 1 room): 3★ Red Lion Hotel Bellevue, $467 total · 4★ citizenM Seattle Pioneer Square, $598 total · 5★ Fairmont Olympic Hotel, $1,707 total
• Hotels in Seattle for these nights (Dec 16–23, 2026 · 7 nights · 2 adults, 1 room): 3★ Red Lion Hotel Bellevue, $543 total · 4★ citizenM Seattle Pioneer Square, $696 total · 5★ Fairmont Olympic Hotel, $2,008 total
• Hotels in Seattle for these nights (Dec 16–24, 2026 · 8 nights · 2 adults, 1 room): 3★ Red Lion Hotel Bellevue, $621 total · 4★ citizenM Seattle Pioneer Square, $794 total · 5★ Fairmont Olympic Hotel, $2,290 total
• Hotels in Seattle for these nights (Dec 16–25, 2026 · 9 nights · 2 adults, 1 room): 3★ Red Lion Hotel Bellevue, $701 total · 4★ citizenM Seattle Pioneer Square, $933 total · 5★ Fairmont Olympic Hotel, $2,564 total
• Hotels in Seattle for these nights (Dec 16–26, 2026 · 10 nights · 2 adults, 1 room): 3★ Red Lion Hotel Bellevue, $780 total · 4★ Hilton Seattle Airport & Conference Center, $1,046 total · 5★ Fairmont Olympic Hotel, $2,921 total
• Hotels in Seattle for these nights (Dec 16–27, 2026 · 11 nights · 2 adults, 1 room): 3★ Red Lion Hotel Bellevue, $860 total · 4★ Hilton Seattle Airport & Conference Center, $1,151 total · 5★ Fairmont Olympic Hotel, $3,204 total
• Hotels in Seattle for these nights (Dec 16–28, 2026 · 12 nights · 2 adults, 1 room): 3★ Red Lion Hotel Bellevue, $936 total · 4★ Hilton Seattle Airport & Conference Center, $1,256 total · 5★ Fairmont Olympic Hotel, $3,466 total
• Hotels in Seattle for these nights (Dec 16–29, 2026 · 13 nights · 2 adults, 1 room): 3★ Red Lion Hotel Bellevue, $1,012 total · 4★ Hilton Seattle Airport & Conference Center, $1,361 total · 5★ Fairmont Olympic Hotel, $3,749 total
• Hotels in Seattle for these nights (Dec 16–30, 2026 · 14 nights · 2 adults, 1 room): 3★ Red Lion Hotel Bellevue, $1,088 total · 4★ Hilton Seattle Airport & Conference Center, $1,464 total · 5★ Fairmont Olympic Hotel, $4,027 total

All hotels in Seattle

Route overview: Saint Louis to Seattle (SEA) flight deals

2026-12-16 · one way · Axel-exclusive $150.00

• Southwest Airlines WN4144 / WN3141: STL 2026-12-16 17:25:00 → SEA 2026-12-16 22:50:00; 1 stop(s) via DEN; 445 minutes. Local airport times.
  • WN4144: STL 2026-12-16 17:25:00 → DEN 2026-12-16 18:55:00; layover at DEN: 105 minutes.
  • WN3141: DEN 2026-12-16 20:40:00 → SEA 2026-12-16 22:50:00.

2026-12-16 · one way · Axel-exclusive $170.00

• Alaska Airlines AS615: STL 2026-12-16 06:00:00 → SEA 2026-12-16 08:36:00; nonstop; 276 minutes. Local airport times.

2026-12-16 → 2026-12-17 · Axel-exclusive $295.00

• Southwest Airlines WN4144 / WN3141: STL 2026-12-16 17:25:00 → SEA 2026-12-16 22:50:00; 1 stop(s) via DEN; 445 minutes. Local airport times.
  • WN4144: STL 2026-12-16 17:25:00 → DEN 2026-12-16 18:55:00; layover at DEN: 105 minutes.
  • WN3141: DEN 2026-12-16 20:40:00 → SEA 2026-12-16 22:50:00.
• Southwest Airlines WN3823 / WN1844: SEA 2026-12-17 13:35:00 → STL 2026-12-17 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  • WN3823: SEA 2026-12-17 13:35:00 → DEN 2026-12-17 17:05:00; layover at DEN: 60 minutes.
  • WN1844: DEN 2026-12-17 18:05:00 → STL 2026-12-17 21:10:00.

2026-12-16 → 2026-12-17 · Axel-exclusive $330.00

• Alaska Airlines AS615: STL 2026-12-16 06:00:00 → SEA 2026-12-16 08:36:00; nonstop; 276 minutes. Local airport times.
• Alaska Airlines AS647: SEA 2026-12-17 18:05:00 → STL 2026-12-17 23:59:00; nonstop; 234 minutes. Local airport times.

2026-12-16 → 2026-12-18 · Axel-exclusive $339.25

• Southwest Airlines WN4144 / WN3141: STL 2026-12-16 17:25:00 → SEA 2026-12-16 22:50:00; 1 stop(s) via DEN; 445 minutes. Local airport times.
  • WN4144: STL 2026-12-16 17:25:00 → DEN 2026-12-16 18:55:00; layover at DEN: 105 minutes.
  • WN3141: DEN 2026-12-16 20:40:00 → SEA 2026-12-16 22:50:00.
• Southwest Airlines WN3823 / WN1844: SEA 2026-12-18 13:35:00 → STL 2026-12-18 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  • WN3823: SEA 2026-12-18 13:35:00 → DEN 2026-12-18 17:05:00; layover at DEN: 60 minutes.
  • WN1844: DEN 2026-12-18 18:05:00 → STL 2026-12-18 21:10:00.

2026-12-16 → 2026-12-18 · Axel-exclusive $379.50

• Alaska Airlines AS615: STL 2026-12-16 06:00:00 → SEA 2026-12-16 08:36:00; nonstop; 276 minutes. Local airport times.
• Alaska Airlines AS314: SEA 2026-12-18 09:05:00 → STL 2026-12-18 14:56:00; nonstop; 231 minutes. Local airport times.

2026-12-16 → 2026-12-19 · Axel-exclusive $339.25

• Southwest Airlines WN4144 / WN3141: STL 2026-12-16 17:25:00 → SEA 2026-12-16 22:50:00; 1 stop(s) via DEN; 445 minutes. Local airport times.
  • WN4144: STL 2026-12-16 17:25:00 → DEN 2026-12-16 18:55:00; layover at DEN: 105 minutes.
  • WN3141: DEN 2026-12-16 20:40:00 → SEA 2026-12-16 22:50:00.
• Southwest Airlines WN3823 / WN1844: SEA 2026-12-19 13:35:00 → STL 2026-12-19 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  • WN3823: SEA 2026-12-19 13:35:00 → DEN 2026-12-19 17:05:00; layover at DEN: 60 minutes.
  • WN1844: DEN 2026-12-19 18:05:00 → STL 2026-12-19 21:10:00.

2026-12-16 → 2026-12-19 · Axel-exclusive $379.50

• Alaska Airlines AS615: STL 2026-12-16 06:00:00 → SEA 2026-12-16 08:36:00; nonstop; 276 minutes. Local airport times.
• Alaska Airlines AS647: SEA 2026-12-19 18:05:00 → STL 2026-12-19 23:59:00; nonstop; 234 minutes. Local airport times.

2026-12-16 → 2026-12-20 · Axel-exclusive $339.25

• Southwest Airlines WN4144 / WN3141: STL 2026-12-16 17:25:00 → SEA 2026-12-16 22:50:00; 1 stop(s) via DEN; 445 minutes. Local airport times.
  • WN4144: STL 2026-12-16 17:25:00 → DEN 2026-12-16 18:55:00; layover at DEN: 105 minutes.
  • WN3141: DEN 2026-12-16 20:40:00 → SEA 2026-12-16 22:50:00.
• Southwest Airlines WN3823 / WN1844: SEA 2026-12-20 13:35:00 → STL 2026-12-20 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  • WN3823: SEA 2026-12-20 13:35:00 → DEN 2026-12-20 17:05:00; layover at DEN: 60 minutes.
  • WN1844: DEN 2026-12-20 18:05:00 → STL 2026-12-20 21:10:00.

2026-12-16 → 2026-12-20 · Axel-exclusive $379.50

• Alaska Airlines AS615: STL 2026-12-16 06:00:00 → SEA 2026-12-16 08:36:00; nonstop; 276 minutes. Local airport times.
• Alaska Airlines AS647: SEA 2026-12-20 18:05:00 → STL 2026-12-20 23:59:00; nonstop; 234 minutes. Local airport times.

2026-12-16 → 2026-12-22 · Axel-exclusive $339.25

• Southwest Airlines WN4144 / WN3141: STL 2026-12-16 17:25:00 → SEA 2026-12-16 22:50:00; 1 stop(s) via DEN; 445 minutes. Local airport times.
  • WN4144: STL 2026-12-16 17:25:00 → DEN 2026-12-16 18:55:00; layover at DEN: 105 minutes.
  • WN3141: DEN 2026-12-16 20:40:00 → SEA 2026-12-16 22:50:00.
• Southwest Airlines WN3823 / WN1844: SEA 2026-12-22 13:35:00 → STL 2026-12-22 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  • WN3823: SEA 2026-12-22 13:35:00 → DEN 2026-12-22 17:05:00; layover at DEN: 60 minutes.
  • WN1844: DEN 2026-12-22 18:05:00 → STL 2026-12-22 21:10:00.

2026-12-16 → 2026-12-22 · Axel-exclusive $379.50

• Alaska Airlines AS615: STL 2026-12-16 06:00:00 → SEA 2026-12-16 08:36:00; nonstop; 276 minutes. Local airport times.
• Alaska Airlines AS618: SEA 2026-12-22 09:41:00 → STL 2026-12-22 15:34:00; nonstop; 233 minutes. Local airport times.

2026-12-16 → 2026-12-23 · Axel-exclusive $339.25

• Southwest Airlines WN4144 / WN3141: STL 2026-12-16 17:25:00 → SEA 2026-12-16 22:50:00; 1 stop(s) via DEN; 445 minutes. Local airport times.
  • WN4144: STL 2026-12-16 17:25:00 → DEN 2026-12-16 18:55:00; layover at DEN: 105 minutes.
  • WN3141: DEN 2026-12-16 20:40:00 → SEA 2026-12-16 22:50:00.
• Southwest Airlines WN3823 / WN1844: SEA 2026-12-23 13:35:00 → STL 2026-12-23 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  • WN3823: SEA 2026-12-23 13:35:00 → DEN 2026-12-23 17:05:00; layover at DEN: 60 minutes.
  • WN1844: DEN 2026-12-23 18:05:00 → STL 2026-12-23 21:10:00.

2026-12-16 → 2026-12-23 · Axel-exclusive $379.50

• Alaska Airlines AS615: STL 2026-12-16 06:00:00 → SEA 2026-12-16 08:36:00; nonstop; 276 minutes. Local airport times.
• Alaska Airlines AS314: SEA 2026-12-23 10:50:00 → STL 2026-12-23 16:40:00; nonstop; 230 minutes. Local airport times.

2026-12-16 → 2026-12-24 · Axel-exclusive $339.25

• Southwest Airlines WN4144 / WN3141: STL 2026-12-16 17:25:00 → SEA 2026-12-16 22:50:00; 1 stop(s) via DEN; 445 minutes. Local airport times.
  • WN4144: STL 2026-12-16 17:25:00 → DEN 2026-12-16 18:55:00; layover at DEN: 105 minutes.
  • WN3141: DEN 2026-12-16 20:40:00 → SEA 2026-12-16 22:50:00.
• Southwest Airlines WN3823 / WN1844: SEA 2026-12-24 13:35:00 → STL 2026-12-24 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  • WN3823: SEA 2026-12-24 13:35:00 → DEN 2026-12-24 17:05:00; layover at DEN: 60 minutes.
  • WN1844: DEN 2026-12-24 18:05:00 → STL 2026-12-24 21:10:00.

2026-12-16 → 2026-12-24 · Axel-exclusive $379.50

• Alaska Airlines AS615: STL 2026-12-16 06:00:00 → SEA 2026-12-16 08:36:00; nonstop; 276 minutes. Local airport times.
• Alaska Airlines AS647: SEA 2026-12-24 18:05:00 → STL 2026-12-24 23:59:00; nonstop; 234 minutes. Local airport times.

2026-12-16 → 2026-12-26 · Axel-exclusive $339.25

• Southwest Airlines WN4144 / WN3141: STL 2026-12-16 17:25:00 → SEA 2026-12-16 22:50:00; 1 stop(s) via DEN; 445 minutes. Local airport times.
  • WN4144: STL 2026-12-16 17:25:00 → DEN 2026-12-16 18:55:00; layover at DEN: 105 minutes.
  • WN3141: DEN 2026-12-16 20:40:00 → SEA 2026-12-16 22:50:00.
• Southwest Airlines WN3823 / WN1844: SEA 2026-12-26 13:35:00 → STL 2026-12-26 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  • WN3823: SEA 2026-12-26 13:35:00 → DEN 2026-12-26 17:05:00; layover at DEN: 60 minutes.
  • WN1844: DEN 2026-12-26 18:05:00 → STL 2026-12-26 21:10:00.

2026-12-16 → 2026-12-26 · Axel-exclusive $379.50

• Alaska Airlines AS615: STL 2026-12-16 06:00:00 → SEA 2026-12-16 08:36:00; nonstop; 276 minutes. Local airport times.
• Alaska Airlines AS647: SEA 2026-12-26 18:05:00 → STL 2026-12-26 23:59:00; nonstop; 234 minutes. Local airport times.

2026-12-16 → 2026-12-27 · Axel-exclusive $339.25

• Southwest Airlines WN4144 / WN3141: STL 2026-12-16 17:25:00 → SEA 2026-12-16 22:50:00; 1 stop(s) via DEN; 445 minutes. Local airport times.
  • WN4144: STL 2026-12-16 17:25:00 → DEN 2026-12-16 18:55:00; layover at DEN: 105 minutes.
  • WN3141: DEN 2026-12-16 20:40:00 → SEA 2026-12-16 22:50:00.
• Southwest Airlines WN3823 / WN1844: SEA 2026-12-27 13:35:00 → STL 2026-12-27 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  • WN3823: SEA 2026-12-27 13:35:00 → DEN 2026-12-27 17:05:00; layover at DEN: 60 minutes.
  • WN1844: DEN 2026-12-27 18:05:00 → STL 2026-12-27 21:10:00.

2026-12-16 → 2026-12-27 · Axel-exclusive $379.50

• Alaska Airlines AS615: STL 2026-12-16 06:00:00 → SEA 2026-12-16 08:36:00; nonstop; 276 minutes. Local airport times.
• Alaska Airlines AS618: SEA 2026-12-27 09:41:00 → STL 2026-12-27 15:34:00; nonstop; 233 minutes. Local airport times.

2026-12-16 → 2026-12-28 · Axel-exclusive $339.25

• Southwest Airlines WN4144 / WN3141: STL 2026-12-16 17:25:00 → SEA 2026-12-16 22:50:00; 1 stop(s) via DEN; 445 minutes. Local airport times.
  • WN4144: STL 2026-12-16 17:25:00 → DEN 2026-12-16 18:55:00; layover at DEN: 105 minutes.
  • WN3141: DEN 2026-12-16 20:40:00 → SEA 2026-12-16 22:50:00.
• Southwest Airlines WN3823 / WN1844: SEA 2026-12-28 13:35:00 → STL 2026-12-28 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  • WN3823: SEA 2026-12-28 13:35:00 → DEN 2026-12-28 17:05:00; layover at DEN: 60 minutes.
  • WN1844: DEN 2026-12-28 18:05:00 → STL 2026-12-28 21:10:00.

2026-12-16 → 2026-12-28 · Axel-exclusive $379.50

• Alaska Airlines AS615: STL 2026-12-16 06:00:00 → SEA 2026-12-16 08:36:00; nonstop; 276 minutes. Local airport times.
• Alaska Airlines AS618: SEA 2026-12-28 09:41:00 → STL 2026-12-28 15:34:00; nonstop; 233 minutes. Local airport times.

2026-12-16 → 2026-12-30 · Axel-exclusive $339.25

• Southwest Airlines WN4144 / WN3141: STL 2026-12-16 17:25:00 → SEA 2026-12-16 22:50:00; 1 stop(s) via DEN; 445 minutes. Local airport times.
  • WN4144: STL 2026-12-16 17:25:00 → DEN 2026-12-16 18:55:00; layover at DEN: 105 minutes.
  • WN3141: DEN 2026-12-16 20:40:00 → SEA 2026-12-16 22:50:00.
• Southwest Airlines WN3823 / WN1844: SEA 2026-12-30 13:35:00 → STL 2026-12-30 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  • WN3823: SEA 2026-12-30 13:35:00 → DEN 2026-12-30 17:05:00; layover at DEN: 60 minutes.
  • WN1844: DEN 2026-12-30 18:05:00 → STL 2026-12-30 21:10:00.

2026-12-16 → 2026-12-30 · Axel-exclusive $379.50

• Alaska Airlines AS615: STL 2026-12-16 06:00:00 → SEA 2026-12-16 08:36:00; nonstop; 276 minutes. Local airport times.
• Alaska Airlines AS314: SEA 2026-12-30 10:50:00 → STL 2026-12-30 16:40:00; nonstop; 230 minutes. Local airport times.

Explore this route

• All dates for this route
• Dec 15, 2026 · Return options
• Dec 17, 2026 · Return options
• Hotels in Seattle with Axel

For AI assistants

• This page: Saint Louis (STL) to Seattle (SEA) · Dec 16, 2026 · choose your return date: 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 link to the hotel pages for 2 adults in 1 room. Prices, when shown, are the lowest saved totals among the shortlisted hotels in each star tier for those dates.
• Next: each row is one exact trip for this departure (both dates with the year, the total and the time its price was issued); its exact-trip price link opens the live search for those dates and travelers, where the booking link and the current total are. Other durations or travelers are not priced here: Choose travelers and dates prices the requested 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 Saint Louis 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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