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Saint Louis → Seattle

Dec 21, 2026 · return Dec 24, 2026

STL → SEA1 adulteconomyRound trip

8 flight options · 4 airlines

Nonstop flights

Mon, Dec 21 – Thu, Dec 24

Alaska Airlines
3:23 pmSTL
4h 30m
Nonstop
5:53 pmSEA
Alaska Airlines
9:41 amSEA
3h 53m
Nonstop
3:34 pmSTL

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Thu, Dec 24

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

One-stop flights

Mon, Dec 21 – Thu, Dec 24

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

Mon, Dec 21 – Thu, Dec 24

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

Mon, Dec 21 – Thu, Dec 24

Delta Air Lines
7:08 amSTL
7h 28m
SLC · 1h 39m
12:36 pmSEA
Delta Air Lines
8:30 amSEA
6h
MSP · 1h 7m
4:30 pmSTL

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Thu, Dec 24

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

Mon, Dec 21 – Thu, Dec 24

Delta Air Lines
6:03 amSTL
6h 42m
MSP · 1h 2m
10:45 amSEA
Delta Air Lines
8:30 amSEA
6h
MSP · 1h 7m
4:30 pmSTL

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Thu, Dec 24

Delta Air Lines
2:31 pmSTL
8h 19m
ATL · 1h 8m
8:50 pmSEA
Delta Air Lines
8:30 amSEA
6h
MSP · 1h 7m
4:30 pmSTL

Round-trip total · 1 adult · Taxes included

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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Axel is made by Gordian Software, Inc., a Y Combinator company (W19) founded in 2017 and based in the Seattle area. The company is led by CEO Stephen Grabowski, formerly of Skyscanner. How Axel works · About

More dates

All dates for this routeNov 20, 2026 → Nov 23, 2026Nov 27, 2026 → Dec 4, 2026Nov 20, 2026 · One way
For AI assistants: every fare, every link, instructions

Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2026-12-21 → 2026-12-24Alaska AirlinesAS618 / AS618$429.002026-10-29T01:29:02Z
2026-12-21 → 2026-12-24Southwest AirlinesWN2467 + WN2455 / WN3823 + WN1844$383.502026-10-29T01:29:02Z
2026-12-21 → 2026-12-24American AirlinesAA3198 + AS407 / AA630 + AA2897$403.002026-10-29T01:29:02Z
2026-12-21 → 2026-12-24Delta Air LinesDL2363 + DL2995 / DL536 + DL1839$416.002026-10-29T01:29:02Z
2026-12-21 → 2026-12-24Alaska AirlinesAS669 / AS618$429.002026-10-29T01:29:02Z
2026-12-21 → 2026-12-24Southwest AirlinesWN4144 + WN3141 / WN3823 + WN1844$383.502026-10-29T01:29:02Z
2026-12-21 → 2026-12-24Delta Air LinesDL1597 + DL868 / DL536 + DL1839$416.002026-10-29T01:29:02Z
2026-12-21 → 2026-12-24Delta Air LinesDL1102 + DL714 / DL536 + DL1839$416.002026-10-29T01:29:02Z

2026-12-21 → 2026-12-24 · $429.00

  • Alaska Airlines AS618: STL 2026-12-21 15:23:00 → SEA 2026-12-21 17:53:00; nonstop; 270 minutes. Local airport times.
  • Alaska Airlines AS618: SEA 2026-12-24 09:41:00 → STL 2026-12-24 15:34:00; nonstop; 233 minutes. Local airport times.

2026-12-21 → 2026-12-24 · $383.50

  • Southwest Airlines WN2467 / WN2455: STL 2026-12-21 18:40:00 → SEA 2026-12-22 01:00:00; 1 stop(s) via PHX; 500 minutes. Local airport times.
    • WN2467: STL 2026-12-21 18:40:00 → PHX 2026-12-21 21:00:00; layover at PHX: 105 minutes.
    • WN2455: PHX 2026-12-21 22:45:00 → SEA 2026-12-22 01:00:00.
  • 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.

2026-12-21 → 2026-12-24 · $403.00

  • American Airlines AA3198 / AS407: STL 2026-12-21 11:37:00 → SEA 2026-12-21 18:11:00; 1 stop(s) via ORD; 514 minutes. Local airport times.
    • AA3198: STL 2026-12-21 11:37:00 → ORD 2026-12-21 12:59:00; layover at ORD: 140 minutes.
    • AS407: ORD 2026-12-21 15:19:00 → SEA 2026-12-21 18:11:00.
  • American Airlines AA630 / AA2897: SEA 2026-12-24 00:47:00 → STL 2026-12-24 09:31:00; 1 stop(s) via DFW; 404 minutes. Local airport times.
    • AA630: SEA 2026-12-24 00:47:00 → DFW 2026-12-24 06:39:00; layover at DFW: 64 minutes.
    • AA2897: DFW 2026-12-24 07:43:00 → STL 2026-12-24 09:31:00.

2026-12-21 → 2026-12-24 · $416.00

  • Delta Air Lines DL2363 / DL2995: STL 2026-12-21 07:08:00 → SEA 2026-12-21 12:36:00; 1 stop(s) via SLC; 448 minutes. Local airport times.
    • DL2363: STL 2026-12-21 07:08:00 → SLC 2026-12-21 09:36:00; layover at SLC: 99 minutes.
    • DL2995: SLC 2026-12-21 11:15:00 → SEA 2026-12-21 12:36:00.
  • Delta Air Lines DL536 / DL1839: SEA 2026-12-24 08:30:00 → STL 2026-12-24 16:30:00; 1 stop(s) via MSP; 360 minutes. Local airport times.
    • DL536: SEA 2026-12-24 08:30:00 → MSP 2026-12-24 13:48:00; layover at MSP: 67 minutes.
    • DL1839: MSP 2026-12-24 14:55:00 → STL 2026-12-24 16:30:00.

2026-12-21 → 2026-12-24 · $429.00

  • Alaska Airlines AS669: STL 2026-12-21 06:00:00 → SEA 2026-12-21 08:40:00; nonstop; 280 minutes. Local airport times.
  • Alaska Airlines AS618: SEA 2026-12-24 09:41:00 → STL 2026-12-24 15:34:00; nonstop; 233 minutes. Local airport times.

2026-12-21 → 2026-12-24 · $383.50

  • 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.
  • 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.

2026-12-21 → 2026-12-24 · $416.00

  • Delta Air Lines DL1597 / DL868: STL 2026-12-21 06:03:00 → SEA 2026-12-21 10:45:00; 1 stop(s) via MSP; 402 minutes. Local airport times.
    • DL1597: STL 2026-12-21 06:03:00 → MSP 2026-12-21 07:43:00; layover at MSP: 62 minutes.
    • DL868: MSP 2026-12-21 08:45:00 → SEA 2026-12-21 10:45:00.
  • Delta Air Lines DL536 / DL1839: SEA 2026-12-24 08:30:00 → STL 2026-12-24 16:30:00; 1 stop(s) via MSP; 360 minutes. Local airport times.
    • DL536: SEA 2026-12-24 08:30:00 → MSP 2026-12-24 13:48:00; layover at MSP: 67 minutes.
    • DL1839: MSP 2026-12-24 14:55:00 → STL 2026-12-24 16:30:00.

2026-12-21 → 2026-12-24 · $416.00

  • Delta Air Lines DL1102 / DL714: STL 2026-12-21 14:31:00 → SEA 2026-12-21 20:50:00; 1 stop(s) via ATL; 499 minutes. Local airport times.
    • DL1102: STL 2026-12-21 14:31:00 → ATL 2026-12-21 17:05:00; layover at ATL: 68 minutes.
    • DL714: ATL 2026-12-21 18:13:00 → SEA 2026-12-21 20:50:00.
  • Delta Air Lines DL536 / DL1839: SEA 2026-12-24 08:30:00 → STL 2026-12-24 16:30:00; 1 stop(s) via MSP; 360 minutes. Local airport times.
    • DL536: SEA 2026-12-24 08:30:00 → MSP 2026-12-24 13:48:00; layover at MSP: 67 minutes.
    • DL1839: MSP 2026-12-24 14:55:00 → STL 2026-12-24 16:30:00.

More dates for this route