Seattle (SEA) to Saint Louis (STL), Dec 15, 2026: round trips from $310, one way from $160

Seattle (SEA) to Saint Louis (STL), Dec 15, 2026: round trips from $310, one way from $160 on Axel, checked Oct 29, 2026. Lowest published fares: $310 round trip, Axel-exclusive, Southwest Airlines, 1 stop, Dec 15–16, 2026; $160 one way, Axel-exclusive, Southwest Airlines, 1 stop, Dec 15, 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 St. Louis for these trips

Hotels: under a trip, hotels in St. Louis 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 St. Louis for these nights (Dec 15–16, 2026 · 1 night · 2 adults, 1 room): 3★ Clayton Plaza Hotel & Extended Stay, $64 total · 4★ Hilton St. Louis at the Ballpark, $105 total · 5★ Four Seasons Hotel St Louis, $366 total
• Hotels in St. Louis for these nights (Dec 15–17, 2026 · 2 nights · 2 adults, 1 room): 3★ Clayton Plaza Hotel & Extended Stay, $127 total · 4★ Hilton St. Louis at the Ballpark, $210 total · 5★ Four Seasons Hotel St Louis, $732 total
• Hotels in St. Louis for these nights (Dec 15–18, 2026 · 3 nights · 2 adults, 1 room): 3★ Clayton Plaza Hotel & Extended Stay, $192 total · 4★ Hilton St. Louis at the Ballpark, $315 total · 5★ Four Seasons Hotel St Louis, $1,098 total
• Hotels in St. Louis for these nights (Dec 15–19, 2026 · 4 nights · 2 adults, 1 room): 3★ Clayton Plaza Hotel & Extended Stay, $267 total · 4★ Hilton St. Louis at the Ballpark, $420 total · 5★ Four Seasons Hotel St Louis, $1,464 total
• Hotels in St. Louis for these nights (Dec 15–20, 2026 · 5 nights · 2 adults, 1 room): 3★ Clayton Plaza Hotel & Extended Stay, $339 total · 4★ Hilton St. Louis at the Ballpark, $525 total · 5★ Four Seasons Hotel St Louis, $1,879 total
• Hotels in St. Louis for these nights (Dec 15–21, 2026 · 6 nights · 2 adults, 1 room): 3★ Clayton Plaza Hotel & Extended Stay, $413 total · 4★ Hilton St. Louis at the Ballpark, $627 total · 5★ Four Seasons Hotel St Louis, $2,294 total
• Hotels in St. Louis for these nights (Dec 15–22, 2026 · 7 nights · 2 adults, 1 room): 3★ Clayton Plaza Hotel & Extended Stay, $487 total · 4★ Hilton St. Louis at the Ballpark, $731 total · 5★ Four Seasons Hotel St Louis, $2,660 total
• Hotels in St. Louis for these nights (Dec 15–23, 2026 · 8 nights · 2 adults, 1 room): 3★ Clayton Plaza Hotel & Extended Stay, $551 total · 4★ Hilton St. Louis at the Ballpark, $836 total · 5★ Four Seasons Hotel St Louis, $3,026 total
• Hotels in St. Louis for these nights (Dec 15–24, 2026 · 9 nights · 2 adults, 1 room): 3★ Clayton Plaza Hotel & Extended Stay, $618 total · 4★ Hilton St. Louis at the Ballpark, $941 total · 5★ Four Seasons Hotel St Louis, $3,392 total
• Hotels in St. Louis for these nights (Dec 15–25, 2026 · 10 nights · 2 adults, 1 room): 3★ Clayton Plaza Hotel & Extended Stay, $683 total · 4★ Hilton St. Louis at the Ballpark, $1,046 total · 5★ Four Seasons Hotel St Louis, $3,758 total
• Hotels in St. Louis for these nights (Dec 15–26, 2026 · 11 nights · 2 adults, 1 room): 3★ Clayton Plaza Hotel & Extended Stay, $754 total · 4★ Hilton St. Louis at the Ballpark, $1,151 total · 5★ Four Seasons Hotel St Louis, $4,124 total
• Hotels in St. Louis for these nights (Dec 15–27, 2026 · 12 nights · 2 adults, 1 room): 3★ Clayton Plaza Hotel & Extended Stay, $827 total · 4★ Hilton St. Louis at the Ballpark, $1,256 total · 5★ Four Seasons Hotel St Louis, $4,617 total
• Hotels in St. Louis for these nights (Dec 15–28, 2026 · 13 nights · 2 adults, 1 room): 3★ Clayton Plaza Hotel & Extended Stay, $901 total · 4★ Hilton St. Louis at the Ballpark, $1,360 total · 5★ Four Seasons Hotel St Louis, $4,983 total
• Hotels in St. Louis for these nights (Dec 15–29, 2026 · 14 nights · 2 adults, 1 room): 3★ Clayton Plaza Hotel & Extended Stay, $965 total · 4★ Hilton St. Louis at the Ballpark, $1,464 total · 5★ Four Seasons Hotel St Louis, $5,349 total

All hotels in St. Louis

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

2026-12-15 · one way · Axel-exclusive $160.00

• Southwest Airlines WN3823 / WN1844: SEA 2026-12-15 13:35:00 → STL 2026-12-15 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  • WN3823: SEA 2026-12-15 13:35:00 → DEN 2026-12-15 17:05:00; layover at DEN: 60 minutes.
  • WN1844: DEN 2026-12-15 18:05:00 → STL 2026-12-15 21:10:00.

2026-12-15 · one way · Axel-exclusive $180.00

• Alaska Airlines AS314: SEA 2026-12-15 10:50:00 → STL 2026-12-15 16:40:00; nonstop; 230 minutes. Local airport times.

2026-12-15 → 2026-12-16 · Axel-exclusive $310.00

• Southwest Airlines WN3823 / WN1844: SEA 2026-12-15 13:35:00 → STL 2026-12-15 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  • WN3823: SEA 2026-12-15 13:35:00 → DEN 2026-12-15 17:05:00; layover at DEN: 60 minutes.
  • WN1844: DEN 2026-12-15 18:05:00 → STL 2026-12-15 21:10:00.
• 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.

2026-12-15 → 2026-12-16 · Axel-exclusive $350.00

• Alaska Airlines AS314: SEA 2026-12-15 10:50:00 → STL 2026-12-15 16:40:00; nonstop; 230 minutes. Local airport times.
• Alaska Airlines AS615: STL 2026-12-16 06:00:00 → SEA 2026-12-16 08:36:00; nonstop; 276 minutes. Local airport times.

2026-12-15 → 2026-12-17 · Axel-exclusive $310.00

• Southwest Airlines WN3823 / WN1844: SEA 2026-12-15 13:35:00 → STL 2026-12-15 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  • WN3823: SEA 2026-12-15 13:35:00 → DEN 2026-12-15 17:05:00; layover at DEN: 60 minutes.
  • WN1844: DEN 2026-12-15 18:05:00 → STL 2026-12-15 21:10:00.
• Southwest Airlines WN4144 / WN3141: STL 2026-12-17 17:25:00 → SEA 2026-12-17 22:50:00; 1 stop(s) via DEN; 445 minutes. Local airport times.
  • WN4144: STL 2026-12-17 17:25:00 → DEN 2026-12-17 18:55:00; layover at DEN: 105 minutes.
  • WN3141: DEN 2026-12-17 20:40:00 → SEA 2026-12-17 22:50:00.

2026-12-15 → 2026-12-17 · Axel-exclusive $350.00

• Alaska Airlines AS314: SEA 2026-12-15 10:50:00 → STL 2026-12-15 16:40:00; nonstop; 230 minutes. Local airport times.
• Alaska Airlines AS615: STL 2026-12-17 06:04:00 → SEA 2026-12-17 08:50:00; nonstop; 286 minutes. Local airport times.

2026-12-15 → 2026-12-18 · Axel-exclusive $310.00

• Southwest Airlines WN3823 / WN1844: SEA 2026-12-15 13:35:00 → STL 2026-12-15 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  • WN3823: SEA 2026-12-15 13:35:00 → DEN 2026-12-15 17:05:00; layover at DEN: 60 minutes.
  • WN1844: DEN 2026-12-15 18:05:00 → STL 2026-12-15 21:10:00.
• Southwest Airlines WN4144 / WN3141: STL 2026-12-18 17:25:00 → SEA 2026-12-18 22:50:00; 1 stop(s) via DEN; 445 minutes. Local airport times.
  • WN4144: STL 2026-12-18 17:25:00 → DEN 2026-12-18 18:55:00; layover at DEN: 105 minutes.
  • WN3141: DEN 2026-12-18 20:40:00 → SEA 2026-12-18 22:50:00.

2026-12-15 → 2026-12-18 · Axel-exclusive $350.00

• Alaska Airlines AS314: SEA 2026-12-15 10:50:00 → STL 2026-12-15 16:40:00; nonstop; 230 minutes. Local airport times.
• Alaska Airlines AS615: STL 2026-12-18 06:00:00 → SEA 2026-12-18 08:42:00; nonstop; 282 minutes. Local airport times.

2026-12-15 → 2026-12-19 · Axel-exclusive $372.00

• Southwest Airlines WN3823 / WN1844: SEA 2026-12-15 13:35:00 → STL 2026-12-15 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  • WN3823: SEA 2026-12-15 13:35:00 → DEN 2026-12-15 17:05:00; layover at DEN: 60 minutes.
  • WN1844: DEN 2026-12-15 18:05:00 → STL 2026-12-15 21:10:00.
• Southwest Airlines WN2467 / WN2455: STL 2026-12-19 18:40:00 → SEA 2026-12-20 01:00:00; 1 stop(s) via PHX; 500 minutes. Local airport times.
  • WN2467: STL 2026-12-19 18:40:00 → PHX 2026-12-19 21:00:00; layover at PHX: 105 minutes.
  • WN2455: PHX 2026-12-19 22:45:00 → SEA 2026-12-20 01:00:00.

2026-12-15 → 2026-12-19 · Axel-exclusive $420.00

• Alaska Airlines AS314: SEA 2026-12-15 10:50:00 → STL 2026-12-15 16:40:00; nonstop; 230 minutes. Local airport times.
• Alaska Airlines AS615: STL 2026-12-19 06:00:00 → SEA 2026-12-19 08:42:00; nonstop; 282 minutes. Local airport times.

2026-12-15 → 2026-12-21 · Axel-exclusive $372.00

• Southwest Airlines WN3823 / WN1844: SEA 2026-12-15 13:35:00 → STL 2026-12-15 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  • WN3823: SEA 2026-12-15 13:35:00 → DEN 2026-12-15 17:05:00; layover at DEN: 60 minutes.
  • WN1844: DEN 2026-12-15 18:05:00 → STL 2026-12-15 21:10:00.
• Southwest Airlines WN4144 / WN3141: STL 2026-12-21 17:25:00 → SEA 2026-12-21 22:50:00; 1 stop(s) via DEN; 445 minutes. Local airport times.
  • WN4144: STL 2026-12-21 17:25:00 → DEN 2026-12-21 18:55:00; layover at DEN: 105 minutes.
  • WN3141: DEN 2026-12-21 20:40:00 → SEA 2026-12-21 22:50:00.

2026-12-15 → 2026-12-21 · Axel-exclusive $420.00

• Alaska Airlines AS314: SEA 2026-12-15 10:50:00 → STL 2026-12-15 16:40:00; nonstop; 230 minutes. Local airport times.
• Alaska Airlines AS669: STL 2026-12-21 06:00:00 → SEA 2026-12-21 08:40:00; nonstop; 280 minutes. Local airport times.

2026-12-15 → 2026-12-22 · Axel-exclusive $372.00

• Southwest Airlines WN3823 / WN1844: SEA 2026-12-15 13:35:00 → STL 2026-12-15 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  • WN3823: SEA 2026-12-15 13:35:00 → DEN 2026-12-15 17:05:00; layover at DEN: 60 minutes.
  • WN1844: DEN 2026-12-15 18:05:00 → STL 2026-12-15 21:10:00.
• Southwest Airlines WN4144 / WN3141: STL 2026-12-22 17:25:00 → SEA 2026-12-22 22:50:00; 1 stop(s) via DEN; 445 minutes. Local airport times.
  • WN4144: STL 2026-12-22 17:25:00 → DEN 2026-12-22 18:55:00; layover at DEN: 105 minutes.
  • WN3141: DEN 2026-12-22 20:40:00 → SEA 2026-12-22 22:50:00.

2026-12-15 → 2026-12-22 · Axel-exclusive $420.00

• Alaska Airlines AS314: SEA 2026-12-15 10:50:00 → STL 2026-12-15 16:40:00; nonstop; 230 minutes. Local airport times.
• Alaska Airlines AS615: STL 2026-12-22 06:00:00 → SEA 2026-12-22 08:42:00; nonstop; 282 minutes. Local airport times.

2026-12-15 → 2026-12-23 · Axel-exclusive $372.00

• Southwest Airlines WN3823 / WN1844: SEA 2026-12-15 13:35:00 → STL 2026-12-15 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  • WN3823: SEA 2026-12-15 13:35:00 → DEN 2026-12-15 17:05:00; layover at DEN: 60 minutes.
  • WN1844: DEN 2026-12-15 18:05:00 → STL 2026-12-15 21:10:00.
• Southwest Airlines WN4144 / WN3141: STL 2026-12-23 17:25:00 → SEA 2026-12-23 22:50:00; 1 stop(s) via DEN; 445 minutes. Local airport times.
  • WN4144: STL 2026-12-23 17:25:00 → DEN 2026-12-23 18:55:00; layover at DEN: 105 minutes.
  • WN3141: DEN 2026-12-23 20:40:00 → SEA 2026-12-23 22:50:00.

2026-12-15 → 2026-12-23 · Axel-exclusive $420.00

• Alaska Airlines AS314: SEA 2026-12-15 10:50:00 → STL 2026-12-15 16:40:00; nonstop; 230 minutes. Local airport times.
• Alaska Airlines AS615: STL 2026-12-23 06:00:00 → SEA 2026-12-23 08:36:00; nonstop; 276 minutes. Local airport times.

2026-12-15 → 2026-12-25 · Axel-exclusive $372.00

• Southwest Airlines WN3823 / WN1844: SEA 2026-12-15 13:35:00 → STL 2026-12-15 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  • WN3823: SEA 2026-12-15 13:35:00 → DEN 2026-12-15 17:05:00; layover at DEN: 60 minutes.
  • WN1844: DEN 2026-12-15 18:05:00 → STL 2026-12-15 21:10:00.
• Southwest Airlines WN4144 / WN3141: STL 2026-12-25 17:25:00 → SEA 2026-12-25 22:50:00; 1 stop(s) via DEN; 445 minutes. Local airport times.
  • WN4144: STL 2026-12-25 17:25:00 → DEN 2026-12-25 18:55:00; layover at DEN: 105 minutes.
  • WN3141: DEN 2026-12-25 20:40:00 → SEA 2026-12-25 22:50:00.

2026-12-15 → 2026-12-25 · Axel-exclusive $420.00

• Alaska Airlines AS314: SEA 2026-12-15 10:50:00 → STL 2026-12-15 16:40:00; nonstop; 230 minutes. Local airport times.
• Alaska Airlines AS615: STL 2026-12-25 06:00:00 → SEA 2026-12-25 08:42:00; nonstop; 282 minutes. Local airport times.

2026-12-15 → 2026-12-26 · Axel-exclusive $372.00

• Southwest Airlines WN3823 / WN1844: SEA 2026-12-15 13:35:00 → STL 2026-12-15 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  • WN3823: SEA 2026-12-15 13:35:00 → DEN 2026-12-15 17:05:00; layover at DEN: 60 minutes.
  • WN1844: DEN 2026-12-15 18:05:00 → STL 2026-12-15 21:10:00.
• Southwest Airlines WN2467 / WN2455: STL 2026-12-26 18:40:00 → SEA 2026-12-27 01:00:00; 1 stop(s) via PHX; 500 minutes. Local airport times.
  • WN2467: STL 2026-12-26 18:40:00 → PHX 2026-12-26 21:00:00; layover at PHX: 105 minutes.
  • WN2455: PHX 2026-12-26 22:45:00 → SEA 2026-12-27 01:00:00.

2026-12-15 → 2026-12-26 · Axel-exclusive $420.00

• Alaska Airlines AS314: SEA 2026-12-15 10:50:00 → STL 2026-12-15 16:40:00; nonstop; 230 minutes. Local airport times.
• Alaska Airlines AS615: STL 2026-12-26 06:00:00 → SEA 2026-12-26 08:42:00; nonstop; 282 minutes. Local airport times.

2026-12-15 → 2026-12-27 · Axel-exclusive $372.00

• Southwest Airlines WN3823 / WN1844: SEA 2026-12-15 13:35:00 → STL 2026-12-15 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  • WN3823: SEA 2026-12-15 13:35:00 → DEN 2026-12-15 17:05:00; layover at DEN: 60 minutes.
  • WN1844: DEN 2026-12-15 18:05:00 → STL 2026-12-15 21:10:00.
• Southwest Airlines WN4144 / WN3141: STL 2026-12-27 17:25:00 → SEA 2026-12-27 22:50:00; 1 stop(s) via DEN; 445 minutes. Local airport times.
  • WN4144: STL 2026-12-27 17:25:00 → DEN 2026-12-27 18:55:00; layover at DEN: 105 minutes.
  • WN3141: DEN 2026-12-27 20:40:00 → SEA 2026-12-27 22:50:00.

2026-12-15 → 2026-12-27 · Axel-exclusive $420.00

• Alaska Airlines AS314: SEA 2026-12-15 10:50:00 → STL 2026-12-15 16:40:00; nonstop; 230 minutes. Local airport times.
• Alaska Airlines AS618: STL 2026-12-27 15:23:00 → SEA 2026-12-27 17:53:00; nonstop; 270 minutes. Local airport times.

2026-12-15 → 2026-12-29 · Axel-exclusive $372.00

• Southwest Airlines WN3823 / WN1844: SEA 2026-12-15 13:35:00 → STL 2026-12-15 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  • WN3823: SEA 2026-12-15 13:35:00 → DEN 2026-12-15 17:05:00; layover at DEN: 60 minutes.
  • WN1844: DEN 2026-12-15 18:05:00 → STL 2026-12-15 21:10:00.
• Southwest Airlines WN4144 / WN3141: STL 2026-12-29 17:25:00 → SEA 2026-12-29 22:50:00; 1 stop(s) via DEN; 445 minutes. Local airport times.
  • WN4144: STL 2026-12-29 17:25:00 → DEN 2026-12-29 18:55:00; layover at DEN: 105 minutes.
  • WN3141: DEN 2026-12-29 20:40:00 → SEA 2026-12-29 22:50:00.

2026-12-15 → 2026-12-29 · Axel-exclusive $420.00

• Alaska Airlines AS314: SEA 2026-12-15 10:50:00 → STL 2026-12-15 16:40:00; nonstop; 230 minutes. Local airport times.
• Alaska Airlines AS615: STL 2026-12-29 06:00:00 → SEA 2026-12-29 08:42:00; nonstop; 282 minutes. Local airport times.

Explore this route

• All dates for this route
• Dec 14, 2026 · Return options
• Dec 16, 2026 · Return options
• Hotels in St. Louis with Axel

For AI assistants

• This page: Seattle (SEA) to Saint Louis (STL) · Dec 15, 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 St. Louis 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 Seattle to Saint Louis (STL) 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