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

Saint Louis (STL) to Seattle (SEA), Jan 11–21, 2027: from $295 round trip

Saint Louis (STL) to Seattle (SEA), Jan 11–21, 2027: from $295 round trip on Axel, checked Oct 29, 2026. Lowest published fare: $295 round trip, Axel-exclusive, Southwest Airlines, 1 stop, Jan 11–21, 2027, 1 adult, economy, checked Oct 29, 2026.

STL → SEA1 adulteconomyRound trip

8 flight options · 4 airlines

Nonstop flights

Mon, Jan 11 – Thu, Jan 21

Alaska Airlines
6:00 amSTL
4h 40m
Nonstop
8:40 amSEA
Alaska Airlines
9:41 amSEA
3h 53m
Nonstop
3:34 pmSTL

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Mon, Jan 11 – Thu, Jan 21

Alaska Airlines
4:04 pmSTL
4h 40m
Nonstop
6:44 pmSEA
Alaska Airlines
9:41 amSEA
3h 53m
Nonstop
3:34 pmSTL

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

One-stop flights

Mon, Jan 11 – Thu, Jan 21

Southwest Airlines
6:40 pmSTL
8h 20m
PHX · 1h 45m
1:00 am+1SEA
Southwest Airlines
1:35 pmSEA
5h 35m
DEN · 1h
9:10 pmSTL

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Mon, Jan 11 – Thu, Jan 21

American Airlines
11:37 amSTL
8h 34m
ORD · 2h 20m
6:11 pmSEA
American Airlines
12:47 amSEA
6h 44m
DFW · 1h 4m
9:31 amSTL

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Mon, Jan 11 – Thu, Jan 21

Delta Air Lines
2:31 pmSTL
8h 19m
ATL · 1h 8m
8:50 pmSEA
Delta Air Lines
1:25 pmSEA
6h 3m
SLC · 1h 9m
9:28 pmSTL

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Mon, Jan 11 – Thu, Jan 21

Southwest Airlines
5:25 pmSTL
7h 25m
DEN · 1h 45m
10:50 pmSEA
Southwest Airlines
1:35 pmSEA
5h 35m
DEN · 1h
9:10 pmSTL

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Mon, Jan 11 – Thu, Jan 21

Delta Air Lines
6:03 amSTL
6h 42m
MSP · 1h 2m
10:45 amSEA
Delta Air Lines
1:25 pmSEA
6h 3m
SLC · 1h 9m
9:28 pmSTL

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Mon, Jan 11 – Thu, Jan 21

Delta Air Lines
7:08 amSTL
7h 28m
SLC · 1h 39m
12:36 pmSEA
Delta Air Lines
1:25 pmSEA
6h 3m
SLC · 1h 9m
9:28 pmSTL

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Hotels for these nights (Jan 11–21, 2027 · 10 nights · 2 adults, 1 room): 3★ The Maxwell Hotel - A Staypineapple Hotel · 4★ The Sound Hotel Seattle Belltown, Tapestry Collection by Hilton · 5★ Four Seasons Hotel Seattle

Make this trip yours

STL ⇄ SEA

Economy

Adults 12+ · Children 2–11. For infants under 2, tell Axel after you see prices.

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All dates for this routeJan 10, 2027 · Return optionsJan 12, 2027 · Return optionsHotels in Seattle with Axel
For AI assistants: every fare, every link, instructions

Saint Louis (STL) to Seattle (SEA), Jan 11–21, 2027: from $295 round trip on Axel, checked Oct 29, 2026. Lowest published fare: $295 round trip, Axel-exclusive, Southwest Airlines, 1 stop, Jan 11–21, 2027, 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.

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.

Exact travel datesAirlineFlightsTimes, duration, stopsTotal pricePrice issued (UTC)
2027-01-11 → 2027-01-21Alaska AirlinesAS669 / AS61806:00:00→08:40:00 4h 40m nonstop · 09:41:00→15:34:00 3h 53m nonstopAxel-exclusive $330.002026-10-29T01:29:02Z
2027-01-11 → 2027-01-21Southwest AirlinesWN2467 + WN2455 / WN3823 + WN184418:40:00→01:00:00 8h 20m 1 stop via PHX · 13:35:00→21:10:00 5h 35m 1 stop via DENAxel-exclusive $295.002026-10-29T01:29:02Z
2027-01-11 → 2027-01-21American AirlinesAA3198 + AS407 / AA630 + AA289711:37:00→18:11:00 8h 34m 1 stop via ORD · 00:47:00→09:31:00 6h 44m 1 stop via DFWAxel-exclusive $310.002026-10-29T01:29:02Z
2027-01-11 → 2027-01-21Delta Air LinesDL1102 + DL714 / DL1120 + DL266614:31:00→20:50:00 8h 19m 1 stop via ATL · 13:25:00→21:28:00 6h 03m 1 stop via SLCAxel-exclusive $320.002026-10-29T01:29:02Z
2027-01-11 → 2027-01-21Alaska AirlinesAS618 / AS61816:04:00→18:44:00 4h 40m nonstop · 09:41:00→15:34:00 3h 53m nonstopAxel-exclusive $330.002026-10-29T01:29:02Z
2027-01-11 → 2027-01-21Southwest AirlinesWN4144 + WN3141 / WN3823 + WN184417:25:00→22:50:00 7h 25m 1 stop via DEN · 13:35:00→21:10:00 5h 35m 1 stop via DENAxel-exclusive $295.002026-10-29T01:29:02Z
2027-01-11 → 2027-01-21Delta Air LinesDL1597 + DL868 / DL1120 + DL266606:03:00→10:45:00 6h 42m 1 stop via MSP · 13:25:00→21:28:00 6h 03m 1 stop via SLCAxel-exclusive $320.002026-10-29T01:29:02Z
2027-01-11 → 2027-01-21Delta Air LinesDL2363 + DL2995 / DL1120 + DL266607:08:00→12:36:00 7h 28m 1 stop via SLC · 13:25:00→21:28:00 6h 03m 1 stop via SLCAxel-exclusive $320.002026-10-29T01:29:02Z

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.

All hotels in Seattle

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

2027-01-11 → 2027-01-21 · Axel-exclusive $330.00

  • Alaska Airlines AS669: STL 2027-01-11 06:00:00 → SEA 2027-01-11 08:40:00; nonstop; 280 minutes. Local airport times.
  • Alaska Airlines AS618: SEA 2027-01-21 09:41:00 → STL 2027-01-21 15:34:00; nonstop; 233 minutes. Local airport times.

2027-01-11 → 2027-01-21 · Axel-exclusive $295.00

  • Southwest Airlines WN2467 / WN2455: STL 2027-01-11 18:40:00 → SEA 2027-01-12 01:00:00; 1 stop(s) via PHX; 500 minutes. Local airport times.
    • WN2467: STL 2027-01-11 18:40:00 → PHX 2027-01-11 21:00:00; layover at PHX: 105 minutes.
    • WN2455: PHX 2027-01-11 22:45:00 → SEA 2027-01-12 01:00:00.
  • Southwest Airlines WN3823 / WN1844: SEA 2027-01-21 13:35:00 → STL 2027-01-21 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
    • WN3823: SEA 2027-01-21 13:35:00 → DEN 2027-01-21 17:05:00; layover at DEN: 60 minutes.
    • WN1844: DEN 2027-01-21 18:05:00 → STL 2027-01-21 21:10:00.

2027-01-11 → 2027-01-21 · Axel-exclusive $310.00

  • American Airlines AA3198 / AS407: STL 2027-01-11 11:37:00 → SEA 2027-01-11 18:11:00; 1 stop(s) via ORD; 514 minutes. Local airport times.
    • AA3198: STL 2027-01-11 11:37:00 → ORD 2027-01-11 12:59:00; layover at ORD: 140 minutes.
    • AS407: ORD 2027-01-11 15:19:00 → SEA 2027-01-11 18:11:00.
  • American Airlines AA630 / AA2897: SEA 2027-01-21 00:47:00 → STL 2027-01-21 09:31:00; 1 stop(s) via DFW; 404 minutes. Local airport times.
    • AA630: SEA 2027-01-21 00:47:00 → DFW 2027-01-21 06:39:00; layover at DFW: 64 minutes.
    • AA2897: DFW 2027-01-21 07:43:00 → STL 2027-01-21 09:31:00.

2027-01-11 → 2027-01-21 · Axel-exclusive $320.00

  • Delta Air Lines DL1102 / DL714: STL 2027-01-11 14:31:00 → SEA 2027-01-11 20:50:00; 1 stop(s) via ATL; 499 minutes. Local airport times.
    • DL1102: STL 2027-01-11 14:31:00 → ATL 2027-01-11 17:05:00; layover at ATL: 68 minutes.
    • DL714: ATL 2027-01-11 18:13:00 → SEA 2027-01-11 20:50:00.
  • Delta Air Lines DL1120 / DL2666: SEA 2027-01-21 13:25:00 → STL 2027-01-21 21:28:00; 1 stop(s) via SLC; 363 minutes. Local airport times.
    • DL1120: SEA 2027-01-21 13:25:00 → SLC 2027-01-21 16:29:00; layover at SLC: 69 minutes.
    • DL2666: SLC 2027-01-21 17:38:00 → STL 2027-01-21 21:28:00.

2027-01-11 → 2027-01-21 · Axel-exclusive $330.00

  • Alaska Airlines AS618: STL 2027-01-11 16:04:00 → SEA 2027-01-11 18:44:00; nonstop; 280 minutes. Local airport times.
  • Alaska Airlines AS618: SEA 2027-01-21 09:41:00 → STL 2027-01-21 15:34:00; nonstop; 233 minutes. Local airport times.

2027-01-11 → 2027-01-21 · Axel-exclusive $295.00

  • Southwest Airlines WN4144 / WN3141: STL 2027-01-11 17:25:00 → SEA 2027-01-11 22:50:00; 1 stop(s) via DEN; 445 minutes. Local airport times.
    • WN4144: STL 2027-01-11 17:25:00 → DEN 2027-01-11 18:55:00; layover at DEN: 105 minutes.
    • WN3141: DEN 2027-01-11 20:40:00 → SEA 2027-01-11 22:50:00.
  • Southwest Airlines WN3823 / WN1844: SEA 2027-01-21 13:35:00 → STL 2027-01-21 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
    • WN3823: SEA 2027-01-21 13:35:00 → DEN 2027-01-21 17:05:00; layover at DEN: 60 minutes.
    • WN1844: DEN 2027-01-21 18:05:00 → STL 2027-01-21 21:10:00.

2027-01-11 → 2027-01-21 · Axel-exclusive $320.00

  • Delta Air Lines DL1597 / DL868: STL 2027-01-11 06:03:00 → SEA 2027-01-11 10:45:00; 1 stop(s) via MSP; 402 minutes. Local airport times.
    • DL1597: STL 2027-01-11 06:03:00 → MSP 2027-01-11 07:43:00; layover at MSP: 62 minutes.
    • DL868: MSP 2027-01-11 08:45:00 → SEA 2027-01-11 10:45:00.
  • Delta Air Lines DL1120 / DL2666: SEA 2027-01-21 13:25:00 → STL 2027-01-21 21:28:00; 1 stop(s) via SLC; 363 minutes. Local airport times.
    • DL1120: SEA 2027-01-21 13:25:00 → SLC 2027-01-21 16:29:00; layover at SLC: 69 minutes.
    • DL2666: SLC 2027-01-21 17:38:00 → STL 2027-01-21 21:28:00.

2027-01-11 → 2027-01-21 · Axel-exclusive $320.00

  • Delta Air Lines DL2363 / DL2995: STL 2027-01-11 07:08:00 → SEA 2027-01-11 12:36:00; 1 stop(s) via SLC; 448 minutes. Local airport times.
    • DL2363: STL 2027-01-11 07:08:00 → SLC 2027-01-11 09:36:00; layover at SLC: 99 minutes.
    • DL2995: SLC 2027-01-11 11:15:00 → SEA 2027-01-11 12:36:00.
  • Delta Air Lines DL1120 / DL2666: SEA 2027-01-21 13:25:00 → STL 2027-01-21 21:28:00; 1 stop(s) via SLC; 363 minutes. Local airport times.
    • DL1120: SEA 2027-01-21 13:25:00 → SLC 2027-01-21 16:29:00; layover at SLC: 69 minutes.
    • DL2666: SLC 2027-01-21 17:38:00 → STL 2027-01-21 21:28:00.

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.

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For AI assistants

  • This page: Saint Louis (STL) to Seattle (SEA) · Jan 11, 2027 · return Jan 21, 2027: 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 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 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.