Travel with Axel,
get the best price.

San Francisco → Saint Louis

Dec 4, 2026 · return Dec 8, 2026

SFO → STL1 adulteconomyRound trip

10 flight options · 5 airlines

Nonstop flights

Fri, Dec 4 – Tue, Dec 8

Southwest Airlines
1:05 pmSFO
3h 50m
Nonstop
6:55 pmSTL
Southwest Airlines
8:25 amSTL
4h 25m
Nonstop
10:50 amSFO

Round-trip total · 1 adult · Taxes included

Fri, Dec 4 – Tue, Dec 8

United Airlines
12:15 pmSFO
3h 50m
Nonstop
6:05 pmSTL
United Airlines
8:00 amSTL
4h 36m
Nonstop
10:36 amSFO

Round-trip total · 1 adult · Taxes included

Fri, Dec 4 – Tue, Dec 8

Southwest Airlines
11:15 amSFO
3h 55m
Nonstop
5:10 pmSTL
Southwest Airlines
8:00 amSTL
4h 20m
Nonstop
10:20 amSFO

Round-trip total · 1 adult · Taxes included

Fri, Dec 4 – Tue, Dec 8

United Airlines
11:00 pmSFO
4h 6m
Nonstop
5:06 am+1STL
United Airlines
8:00 amSTL
4h 36m
Nonstop
10:36 amSFO

Round-trip total · 1 adult · Taxes included

One-stop flights

Fri, Dec 4 – Tue, Dec 8

Frontier Airlines
11:23 amSFO
5h 51m
DEN · 1h 2m
7:14 pmSTL
Frontier Airlines
2:02 pmSTL
6h 24m
LAS · 1h 4m
6:26 pmSFO

Round-trip total · 1 adult · Taxes included

Fri, Dec 4 – Tue, Dec 8

American Airlines
3:07 pmSFO
6h 29m
LAX · 1h 7m
11:36 pmSTL
American Airlines
2:23 pmSTL
6h 53m
PHX · 1h 14m
7:16 pmSFO

Round-trip total · 1 adult · Taxes included

Fri, Dec 4 – Tue, Dec 8

Delta Air Lines
9:56 amSFO
5h 45m
SLC · 1h 5m
5:41 pmSTL
Delta Air Lines
6:03 amSTL
7h 4m
MSP · 1h 2m
11:07 amSFO

Round-trip total · 1 adult · Taxes included

Fri, Dec 4 – Tue, Dec 8

Southwest Airlines
10:45 pmSFO
6h 55m
BNA · 1h 20m
7:40 am+1STL
Southwest Airlines
8:25 amSTL
4h 25m
Nonstop
10:50 amSFO

Round-trip total · 1 adult · Taxes included

Fri, Dec 4 – Tue, Dec 8

Southwest Airlines
6:00 amSFO
5h 30m
DEN · 1h
1:30 pmSTL
Southwest Airlines
8:25 amSTL
4h 25m
Nonstop
10:50 amSFO

Round-trip total · 1 adult · Taxes included

Fri, Dec 4 – Tue, Dec 8

Southwest Airlines
5:05 amSFO
5h 55m
PHX · 1h 10m
1:00 pmSTL
Southwest Airlines
8:25 amSTL
4h 25m
Nonstop
10:50 amSFO

Round-trip total · 1 adult · Taxes included

Make this trip yours

SFO ⇄ 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, Southwest 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)
2026-12-04 → 2026-12-08Southwest AirlinesWN2989 / WN191$340.002026-10-29T01:19:49Z
2026-12-04 → 2026-12-08United AirlinesUA1905 / UA1257$400.002026-10-29T01:19:49Z
2026-12-04 → 2026-12-08Frontier AirlinesF93436 + F93302 / F93107 + F94157$190.002026-10-29T01:19:49Z
2026-12-04 → 2026-12-08American AirlinesAA6214 + AA6209 / AA2303 + AA2234$330.002026-10-29T01:19:49Z
2026-12-04 → 2026-12-08Delta Air LinesDL920 + DL2373 / DL1597 + DL2078$350.002026-10-29T01:19:49Z
2026-12-04 → 2026-12-08Southwest AirlinesWN2989 / WN4751$340.002026-10-29T01:19:49Z
2026-12-04 → 2026-12-08United AirlinesUA5750 / UA1257$400.002026-10-29T01:19:49Z
2026-12-04 → 2026-12-08Southwest AirlinesWN1262 + WN738 / WN191$325.002026-10-29T01:19:49Z
2026-12-04 → 2026-12-08Southwest AirlinesWN4578 + WN1807 / WN191$325.002026-10-29T01:19:49Z
2026-12-04 → 2026-12-08Southwest AirlinesWN3850 + WN709 / WN191$325.002026-10-29T01:19:49Z

2026-12-04 → 2026-12-08 · $340.00

  • Southwest Airlines WN2989: SFO 2026-12-04 13:05:00 → STL 2026-12-04 18:55:00; nonstop; 230 minutes. Local airport times.
  • Southwest Airlines WN191: STL 2026-12-08 08:25:00 → SFO 2026-12-08 10:50:00; nonstop; 265 minutes. Local airport times.

2026-12-04 → 2026-12-08 · $400.00

  • United Airlines UA1905: SFO 2026-12-04 12:15:00 → STL 2026-12-04 18:05:00; nonstop; 230 minutes. Local airport times.
  • United Airlines UA1257: STL 2026-12-08 08:00:00 → SFO 2026-12-08 10:36:00; nonstop; 276 minutes. Local airport times.

2026-12-04 → 2026-12-08 · $190.00

  • Frontier Airlines F93436 / F93302: SFO 2026-12-04 11:23:00 → STL 2026-12-04 19:14:00; 1 stop(s) via DEN; 351 minutes. Local airport times.
    • F93436: SFO 2026-12-04 11:23:00 → DEN 2026-12-04 15:07:00; layover at DEN: 62 minutes.
    • F93302: DEN 2026-12-04 16:09:00 → STL 2026-12-04 19:14:00.
  • Frontier Airlines F93107 / F94157: STL 2026-12-08 14:02:00 → SFO 2026-12-08 18:26:00; 1 stop(s) via LAS; 384 minutes. Local airport times.
    • F93107: STL 2026-12-08 14:02:00 → LAS 2026-12-08 15:38:00; layover at LAS: 64 minutes.
    • F94157: LAS 2026-12-08 16:42:00 → SFO 2026-12-08 18:26:00.

2026-12-04 → 2026-12-08 · $330.00

  • American Airlines AA6214 / AA6209: SFO 2026-12-04 15:07:00 → STL 2026-12-04 23:36:00; 1 stop(s) via LAX; 389 minutes. Local airport times.
    • AA6214: SFO 2026-12-04 15:07:00 → LAX 2026-12-04 16:43:00; layover at LAX: 67 minutes.
    • AA6209: LAX 2026-12-04 17:50:00 → STL 2026-12-04 23:36:00.
  • American Airlines AA2303 / AA2234: STL 2026-12-08 14:23:00 → SFO 2026-12-08 19:16:00; 1 stop(s) via PHX; 413 minutes. Local airport times.
    • AA2303: STL 2026-12-08 14:23:00 → PHX 2026-12-08 16:51:00; layover at PHX: 74 minutes.
    • AA2234: PHX 2026-12-08 18:05:00 → SFO 2026-12-08 19:16:00.

2026-12-04 → 2026-12-08 · $350.00

  • Delta Air Lines DL920 / DL2373: SFO 2026-12-04 09:56:00 → STL 2026-12-04 17:41:00; 1 stop(s) via SLC; 345 minutes. Local airport times.
    • DL920: SFO 2026-12-04 09:56:00 → SLC 2026-12-04 12:50:00; layover at SLC: 65 minutes.
    • DL2373: SLC 2026-12-04 13:55:00 → STL 2026-12-04 17:41:00.
  • Delta Air Lines DL1597 / DL2078: STL 2026-12-08 06:03:00 → SFO 2026-12-08 11:07:00; 1 stop(s) via MSP; 424 minutes. Local airport times.
    • DL1597: STL 2026-12-08 06:03:00 → MSP 2026-12-08 07:43:00; layover at MSP: 62 minutes.
    • DL2078: MSP 2026-12-08 08:45:00 → SFO 2026-12-08 11:07:00.

2026-12-04 → 2026-12-08 · $340.00

  • Southwest Airlines WN2989: SFO 2026-12-04 11:15:00 → STL 2026-12-04 17:10:00; nonstop; 235 minutes. Local airport times.
  • Southwest Airlines WN4751: STL 2026-12-08 08:00:00 → SFO 2026-12-08 10:20:00; nonstop; 260 minutes. Local airport times.

2026-12-04 → 2026-12-08 · $400.00

  • United Airlines UA5750: SFO 2026-12-04 23:00:00 → STL 2026-12-05 05:06:00; nonstop; 246 minutes. Local airport times.
  • United Airlines UA1257: STL 2026-12-08 08:00:00 → SFO 2026-12-08 10:36:00; nonstop; 276 minutes. Local airport times.

2026-12-04 → 2026-12-08 · $325.00

  • Southwest Airlines WN1262 / WN738: SFO 2026-12-04 22:45:00 → STL 2026-12-05 07:40:00; 1 stop(s) via BNA; 415 minutes. Local airport times.
    • WN1262: SFO 2026-12-04 22:45:00 → BNA 2026-12-05 05:05:00; layover at BNA: 80 minutes.
    • WN738: BNA 2026-12-05 06:25:00 → STL 2026-12-05 07:40:00.
  • Southwest Airlines WN191: STL 2026-12-08 08:25:00 → SFO 2026-12-08 10:50:00; nonstop; 265 minutes. Local airport times.

2026-12-04 → 2026-12-08 · $325.00

  • Southwest Airlines WN4578 / WN1807: SFO 2026-12-04 06:00:00 → STL 2026-12-04 13:30:00; 1 stop(s) via DEN; 330 minutes. Local airport times.
    • WN4578: SFO 2026-12-04 06:00:00 → DEN 2026-12-04 09:30:00; layover at DEN: 60 minutes.
    • WN1807: DEN 2026-12-04 10:30:00 → STL 2026-12-04 13:30:00.
  • Southwest Airlines WN191: STL 2026-12-08 08:25:00 → SFO 2026-12-08 10:50:00; nonstop; 265 minutes. Local airport times.

2026-12-04 → 2026-12-08 · $325.00

  • Southwest Airlines WN3850 / WN709: SFO 2026-12-04 05:05:00 → STL 2026-12-04 13:00:00; 1 stop(s) via PHX; 355 minutes. Local airport times.
    • WN3850: SFO 2026-12-04 05:05:00 → PHX 2026-12-04 08:00:00; layover at PHX: 70 minutes.
    • WN709: PHX 2026-12-04 09:10:00 → STL 2026-12-04 13:00:00.
  • Southwest Airlines WN191: STL 2026-12-08 08:25:00 → SFO 2026-12-08 10:50:00; nonstop; 265 minutes. Local airport times.

More dates for this route