Travel with Axel,
get the best price.

Seattle → Saint Louis

Jan 21, 2027 · return Feb 4, 2027

SEA → STL1 adulteconomyRound trip

8 flight options · 5 airlines

Nonstop flights

Thu, Jan 21 – Thu, Feb 4

Alaska Airlines
6:05 pmSEA
3h 54m
Nonstop
11:59 pmSTL
Alaska Airlines
6:04 amSTL
4h 46m
Nonstop
8:50 amSEA

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Thu, Feb 4

Alaska Airlines
9:41 amSEA
3h 53m
Nonstop
3:34 pmSTL
Alaska Airlines
6:04 amSTL
4h 46m
Nonstop
8:50 amSEA

Round-trip total · 1 adult · Taxes included

One-stop flights

Thu, Jan 21 – Thu, Feb 4

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

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Thu, Feb 4

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

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Thu, Feb 4

United Airlines
5:00 amSEA
5h 56m
DEN · 1h 9m
12:56 pmSTL
Alaska Airlines
6:04 amSTL
4h 46m
Nonstop
8:50 amSEA

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Thu, Feb 4

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

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Thu, Feb 4

United Airlines
2:30 pmSEA
6h 29m
ORD · 1h 5m
10:59 pmSTL
Alaska Airlines
6:04 amSTL
4h 46m
Nonstop
8:50 amSEA

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Thu, Feb 4

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

Round-trip total · 1 adult · Taxes included

Make this trip yours

SEA ⇄ STL

Economy

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

No account needed to see prices.

Already have an account? Log in

Why book with Axel
  • A real airline bookingThe booking is in the airline’s own system under your name. After you book, Alaska Airlines emails you its confirmation code and e-ticket, usually within 15 minutes and occasionally up to a couple of hours while the booking is processed.
  • Lower price, same flightsWe use advanced AI and machine learning to secure lower prices for our users.
  • Not satisfied? Full refund.If you are unhappy with the experience for any reason, or simply change your mind, cancel within 24 hours of booking (departure 7+ days away) and we refund you in full. We stand by our product. Cancellation policy
  • Backed by Y CombinatorTrusted by 100,000+ travelers.

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)
2027-01-21 → 2027-02-04Alaska AirlinesAS647 / AS615$332.502026-10-29T01:16:43Z
2027-01-21 → 2027-02-04Southwest AirlinesWN3823 + WN1844 / WN4144 + WN3141$294.502026-10-29T01:16:43Z
2027-01-21 → 2027-02-04American AirlinesAA630 + AA2897 / AA3198 + AS407$304.002026-10-29T01:16:43Z
2027-01-21 → 2027-02-04United Airlines / Alaska AirlinesUA2601 + UA652 / AS615$325.382026-10-29T01:16:43Z
2027-01-21 → 2027-02-04Delta Air LinesDL1120 + DL2666 / DL2363 + DL2995$327.762026-10-29T01:16:43Z
2027-01-21 → 2027-02-04Alaska AirlinesAS618 / AS615$332.502026-10-29T01:16:43Z
2027-01-21 → 2027-02-04United Airlines / Alaska AirlinesUA2340 + UA1114 / AS615$325.382026-10-29T01:16:43Z
2027-01-21 → 2027-02-04Delta Air LinesDL536 + DL1839 / DL2363 + DL2995$327.762026-10-29T01:16:43Z

2027-01-21 → 2027-02-04 · $332.50

  • Alaska Airlines AS647: SEA 2027-01-21 18:05:00 → STL 2027-01-21 23:59:00; nonstop; 234 minutes. Local airport times.
  • Alaska Airlines AS615: STL 2027-02-04 06:04:00 → SEA 2027-02-04 08:50:00; nonstop; 286 minutes. Local airport times.

2027-01-21 → 2027-02-04 · $294.50

  • 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.
  • Southwest Airlines WN4144 / WN3141: STL 2027-02-04 17:25:00 → SEA 2027-02-04 22:50:00; 1 stop(s) via DEN; 445 minutes. Local airport times.
    • WN4144: STL 2027-02-04 17:25:00 → DEN 2027-02-04 18:55:00; layover at DEN: 105 minutes.
    • WN3141: DEN 2027-02-04 20:40:00 → SEA 2027-02-04 22:50:00.

2027-01-21 → 2027-02-04 · $304.00

  • 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.
  • American Airlines AA3198 / AS407: STL 2027-02-04 11:37:00 → SEA 2027-02-04 18:11:00; 1 stop(s) via ORD; 514 minutes. Local airport times.
    • AA3198: STL 2027-02-04 11:37:00 → ORD 2027-02-04 12:59:00; layover at ORD: 140 minutes.
    • AS407: ORD 2027-02-04 15:19:00 → SEA 2027-02-04 18:11:00.

2027-01-21 → 2027-02-04 · $325.38

  • United Airlines UA2601 / UA652: SEA 2027-01-21 05:00:00 → STL 2027-01-21 12:56:00; 1 stop(s) via DEN; 356 minutes. Local airport times.
    • UA2601: SEA 2027-01-21 05:00:00 → DEN 2027-01-21 08:41:00; layover at DEN: 69 minutes.
    • UA652: DEN 2027-01-21 09:50:00 → STL 2027-01-21 12:56:00.
  • Alaska Airlines AS615: STL 2027-02-04 06:04:00 → SEA 2027-02-04 08:50:00; nonstop; 286 minutes. Local airport times.

2027-01-21 → 2027-02-04 · $327.76

  • 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.
  • Delta Air Lines DL2363 / DL2995: STL 2027-02-04 07:08:00 → SEA 2027-02-04 12:36:00; 1 stop(s) via SLC; 448 minutes. Local airport times.
    • DL2363: STL 2027-02-04 07:08:00 → SLC 2027-02-04 09:36:00; layover at SLC: 99 minutes.
    • DL2995: SLC 2027-02-04 11:15:00 → SEA 2027-02-04 12:36:00.

2027-01-21 → 2027-02-04 · $332.50

  • Alaska Airlines AS618: SEA 2027-01-21 09:41:00 → STL 2027-01-21 15:34:00; nonstop; 233 minutes. Local airport times.
  • Alaska Airlines AS615: STL 2027-02-04 06:04:00 → SEA 2027-02-04 08:50:00; nonstop; 286 minutes. Local airport times.

2027-01-21 → 2027-02-04 · $325.38

  • United Airlines UA2340 / UA1114: SEA 2027-01-21 14:30:00 → STL 2027-01-21 22:59:00; 1 stop(s) via ORD; 389 minutes. Local airport times.
    • UA2340: SEA 2027-01-21 14:30:00 → ORD 2027-01-21 20:40:00; layover at ORD: 65 minutes.
    • UA1114: ORD 2027-01-21 21:45:00 → STL 2027-01-21 22:59:00.
  • Alaska Airlines AS615: STL 2027-02-04 06:04:00 → SEA 2027-02-04 08:50:00; nonstop; 286 minutes. Local airport times.

2027-01-21 → 2027-02-04 · $327.76

  • Delta Air Lines DL536 / DL1839: SEA 2027-01-21 08:30:00 → STL 2027-01-21 16:30:00; 1 stop(s) via MSP; 360 minutes. Local airport times.
    • DL536: SEA 2027-01-21 08:30:00 → MSP 2027-01-21 13:48:00; layover at MSP: 67 minutes.
    • DL1839: MSP 2027-01-21 14:55:00 → STL 2027-01-21 16:30:00.
  • Delta Air Lines DL2363 / DL2995: STL 2027-02-04 07:08:00 → SEA 2027-02-04 12:36:00; 1 stop(s) via SLC; 448 minutes. Local airport times.
    • DL2363: STL 2027-02-04 07:08:00 → SLC 2027-02-04 09:36:00; layover at SLC: 99 minutes.
    • DL2995: SLC 2027-02-04 11:15:00 → SEA 2027-02-04 12:36:00.

More dates for this route