Travel with Axel,
get the best price.

Saint Louis → San Francisco

Dec 9, 2026 · return Dec 19, 2026

STL → SFO1 adulteconomyRound trip

8 flight options · 5 airlines

Nonstop flights

Wed, Dec 9 – Sat, Dec 19

United Airlines
7:05 pmSTL
4h 36m
Nonstop
9:41 pmSFO
United Airlines
12:22 pmSFO
3h 55m
Nonstop
6:17 pmSTL

Round-trip total · 1 adult · Taxes included

Wed, Dec 9 – Sat, Dec 19

United Airlines
8:00 amSTL
4h 36m
Nonstop
10:36 amSFO
United Airlines
12:22 pmSFO
3h 55m
Nonstop
6:17 pmSTL

Round-trip total · 1 adult · Taxes included

One-stop flights

Wed, Dec 9 – Sat, Dec 19

Frontier Airlines
7:58 pmSTL
6h 50m
DEN · 1h 28m
12:48 am+1SFO
Frontier Airlines
11:23 amSFO
5h 51m
DEN · 1h 2m
7:14 pmSTL

Round-trip total · 1 adult · Taxes included

Wed, Dec 9 – Sat, Dec 19

Southwest Airlines
7:55 amSTL
6h 55m
SAN · 1h 20m
12:50 pmSFO
Southwest Airlines
10:45 pmSFO
6h 55m
BNA · 1h 20m
7:40 am+1STL

Round-trip total · 1 adult · Taxes included

Wed, Dec 9 – Sat, Dec 19

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

Round-trip total · 1 adult · Taxes included

Wed, Dec 9 – Sat, Dec 19

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

Round-trip total · 1 adult · Taxes included

Wed, Dec 9 – Sat, Dec 19

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

Round-trip total · 1 adult · Taxes included

Wed, Dec 9 – Sat, Dec 19

Southwest Airlines
8:00 amSTL
4h 20m
Nonstop
10:20 amSFO
Southwest Airlines
10:45 pmSFO
6h 55m
BNA · 1h 20m
7:40 am+1STL

Round-trip total · 1 adult · Taxes included

Make this trip yours

STL ⇄ SFO

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, United 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 routeOct 30, 2026 → Nov 2, 2026Oct 31, 2026 → Nov 7, 2026Nov 13, 2026 → Nov 16, 2026Nov 14, 2026 → Nov 21, 2026Nov 24, 2026 → Nov 29, 2026Nov 27, 2026 → Nov 30, 2026Nov 28, 2026 → Dec 5, 2026Dec 11, 2026 → Dec 14, 2026Dec 12, 2026 → Dec 19, 2026Dec 22, 2026 → Dec 27, 2026Dec 25, 2026 → Dec 28, 2026Dec 26, 2026 → Jan 2, 2027Dec 30, 2026 → Jan 2, 2027Jan 8, 2027 → Jan 11, 2027Jan 9, 2027 → Jan 16, 2027Jan 15, 2027 → Jan 18, 2027Jan 22, 2027 → Jan 25, 2027Jan 23, 2027 → Jan 30, 2027Feb 5, 2027 → Feb 8, 2027Feb 6, 2027 → Feb 13, 2027Feb 12, 2027 → Feb 15, 2027Mar 5, 2027 → Mar 8, 2027Mar 6, 2027 → Mar 13, 2027Mar 25, 2027 → Mar 29, 2027Apr 2, 2027 → Apr 5, 2027Apr 3, 2027 → Apr 10, 2027Apr 30, 2027 → May 3, 2027May 1, 2027 → May 8, 2027May 28, 2027 → May 31, 2027May 29, 2027 → Jun 5, 2027Jun 25, 2027 → Jun 28, 2027Jun 26, 2027 → Jul 3, 2027Jul 2, 2027 → Jul 6, 2027Jul 23, 2027 → Jul 26, 2027Jul 24, 2027 → Jul 31, 2027Aug 20, 2027 → Aug 23, 2027Aug 21, 2027 → Aug 28, 2027Sep 3, 2027 → Sep 6, 2027Sep 17, 2027 → Sep 20, 2027Oct 30, 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)
2026-12-09 → 2026-12-19United AirlinesUA214 / UA1588$452.382026-10-29T01:29:02Z
2026-12-09 → 2026-12-19Frontier AirlinesF94567 + F93439 / F93436 + F93302$229.132026-10-29T01:29:02Z
2026-12-09 → 2026-12-19Southwest AirlinesWN4452 + WN4955 / WN1262 + WN738$364.252026-10-29T01:29:02Z
2026-12-09 → 2026-12-19American AirlinesAA2303 + AA2234 / AA6214 + AA6209$411.252026-10-29T01:29:02Z
2026-12-09 → 2026-12-19Delta Air LinesDL1597 + DL2078 / DL920 + DL2373$440.632026-10-29T01:29:02Z
2026-12-09 → 2026-12-19United AirlinesUA1257 / UA1588$452.382026-10-29T01:29:02Z
2026-12-09 → 2026-12-19Frontier AirlinesF93107 + F94157 / F93436 + F93302$229.132026-10-29T01:29:02Z
2026-12-09 → 2026-12-19Southwest AirlinesWN4751 / WN1262 + WN738$384.252026-10-29T01:29:02Z

2026-12-09 → 2026-12-19 · $452.38

  • United Airlines UA214: STL 2026-12-09 19:05:00 → SFO 2026-12-09 21:41:00; nonstop; 276 minutes. Local airport times.
  • United Airlines UA1588: SFO 2026-12-19 12:22:00 → STL 2026-12-19 18:17:00; nonstop; 235 minutes. Local airport times.

2026-12-09 → 2026-12-19 · $229.13

  • Frontier Airlines F94567 / F93439: STL 2026-12-09 19:58:00 → SFO 2026-12-10 00:48:00; 1 stop(s) via DEN; 410 minutes. Local airport times.
    • F94567: STL 2026-12-09 19:58:00 → DEN 2026-12-09 21:29:00; layover at DEN: 88 minutes.
    • F93439: DEN 2026-12-09 22:57:00 → SFO 2026-12-10 00:48:00.
  • Frontier Airlines F93436 / F93302: SFO 2026-12-19 11:23:00 → STL 2026-12-19 19:14:00; 1 stop(s) via DEN; 351 minutes. Local airport times.
    • F93436: SFO 2026-12-19 11:23:00 → DEN 2026-12-19 15:07:00; layover at DEN: 62 minutes.
    • F93302: DEN 2026-12-19 16:09:00 → STL 2026-12-19 19:14:00.

2026-12-09 → 2026-12-19 · $364.25

  • Southwest Airlines WN4452 / WN4955: STL 2026-12-09 07:55:00 → SFO 2026-12-09 12:50:00; 1 stop(s) via SAN; 415 minutes. Local airport times.
    • WN4452: STL 2026-12-09 07:55:00 → SAN 2026-12-09 09:50:00; layover at SAN: 80 minutes.
    • WN4955: SAN 2026-12-09 11:10:00 → SFO 2026-12-09 12:50:00.
  • Southwest Airlines WN1262 / WN738: SFO 2026-12-19 22:45:00 → STL 2026-12-20 07:40:00; 1 stop(s) via BNA; 415 minutes. Local airport times.
    • WN1262: SFO 2026-12-19 22:45:00 → BNA 2026-12-20 05:05:00; layover at BNA: 80 minutes.
    • WN738: BNA 2026-12-20 06:25:00 → STL 2026-12-20 07:40:00.

2026-12-09 → 2026-12-19 · $411.25

  • American Airlines AA2303 / AA2234: STL 2026-12-09 14:23:00 → SFO 2026-12-09 19:16:00; 1 stop(s) via PHX; 413 minutes. Local airport times.
    • AA2303: STL 2026-12-09 14:23:00 → PHX 2026-12-09 16:51:00; layover at PHX: 74 minutes.
    • AA2234: PHX 2026-12-09 18:05:00 → SFO 2026-12-09 19:16:00.
  • American Airlines AA6214 / AA6209: SFO 2026-12-19 15:07:00 → STL 2026-12-19 23:36:00; 1 stop(s) via LAX; 389 minutes. Local airport times.
    • AA6214: SFO 2026-12-19 15:07:00 → LAX 2026-12-19 16:43:00; layover at LAX: 67 minutes.
    • AA6209: LAX 2026-12-19 17:50:00 → STL 2026-12-19 23:36:00.

2026-12-09 → 2026-12-19 · $440.63

  • Delta Air Lines DL1597 / DL2078: STL 2026-12-09 06:03:00 → SFO 2026-12-09 11:07:00; 1 stop(s) via MSP; 424 minutes. Local airport times.
    • DL1597: STL 2026-12-09 06:03:00 → MSP 2026-12-09 07:43:00; layover at MSP: 62 minutes.
    • DL2078: MSP 2026-12-09 08:45:00 → SFO 2026-12-09 11:07:00.
  • Delta Air Lines DL920 / DL2373: SFO 2026-12-19 09:56:00 → STL 2026-12-19 17:41:00; 1 stop(s) via SLC; 345 minutes. Local airport times.
    • DL920: SFO 2026-12-19 09:56:00 → SLC 2026-12-19 12:50:00; layover at SLC: 65 minutes.
    • DL2373: SLC 2026-12-19 13:55:00 → STL 2026-12-19 17:41:00.

2026-12-09 → 2026-12-19 · $452.38

  • United Airlines UA1257: STL 2026-12-09 08:00:00 → SFO 2026-12-09 10:36:00; nonstop; 276 minutes. Local airport times.
  • United Airlines UA1588: SFO 2026-12-19 12:22:00 → STL 2026-12-19 18:17:00; nonstop; 235 minutes. Local airport times.

2026-12-09 → 2026-12-19 · $229.13

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

2026-12-09 → 2026-12-19 · $384.25

  • Southwest Airlines WN4751: STL 2026-12-09 08:00:00 → SFO 2026-12-09 10:20:00; nonstop; 260 minutes. Local airport times.
  • Southwest Airlines WN1262 / WN738: SFO 2026-12-19 22:45:00 → STL 2026-12-20 07:40:00; 1 stop(s) via BNA; 415 minutes. Local airport times.
    • WN1262: SFO 2026-12-19 22:45:00 → BNA 2026-12-20 05:05:00; layover at BNA: 80 minutes.
    • WN738: BNA 2026-12-20 06:25:00 → STL 2026-12-20 07:40:00.

More dates for this route