San Francisco to St Louis flights

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Lowest observed

€436

Cheapest month

February 2027

Last checked

11 Oct 2026

Observed fares. Prices may change.

Your next trip, last seen at €436

13 Feb 2027

United Airlines · 1 stop · 1 night

Cheapest observed day · Last checked: 11 Oct 2026

Departure

12:00

When to fly

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The lowest fare we observed for each month. Open a month to see its days, then pick your outbound and return. A day with no price is one we will search for you.

Prices are for observed departure and return date pairs. No data does not mean no flights.

Lowest observed: €436, departing 13 Feb 2027 (Last checked: 11 Oct 2026)One-way fareCheck live prices for this route
Airlines seen: United Airlines, Alaska Airlines, Frontier Airlines, Southwest Airlines
Reported fastest flight: 3h 49m
Non-stop: Yes

Short answer

We have seen United Airlines fares from San Francisco to St Louis, non-stop. The lowest fare our own searches returned is €436, seen on 11 Oct 2026. February 2027 is the cheapest month in our observations, at €436. These are prices our searches returned on the dates shown, not quotes; run a live search for today's fare.

About this route

Explore the fares we observed from San Francisco to St Louis. Prices move often, so pick your dates to see the latest options.

Route distance: 2,803 km
Reported fastest flight: 3h 49m
Airlines seen: United Airlines, Alaska Airlines, Frontier Airlines, Southwest Airlines
Alternative airports: SUS

Route-level information; individual journeys vary.
Published schedules report non-stop service with United Airlines. Check current timetables.

A clearer picture of your fare

Observed, not guaranteed

Every price is a fare we actually saw, and it may change at any time.

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How our prices work

Airport to city: straight-line distance

San Francisco International Airport (SFO) → San Francisco, city gazetteer reference point (37.7749, -122.4194): ≈ 18 km.
St. Louis Lambert International Airport (STL) → St Louis, city gazetteer reference point (38.6270, -90.1994): ≈ 20 km.

Approximate distances calculated from coordinates, not road distances or travel times. These airports serve the city; they are not confirmed endpoints of an offer.

Frequently asked

How much is a flight from San Francisco to St Louis?

The lowest fare we have observed is €436, found on 11 Oct 2026. Prices move, so read it as a floor rather than a quote.

When is the cheapest month to fly from San Francisco to St Louis?

In our observations February 2027 is the cheapest month so far, at €436.

Are there direct flights from San Francisco to St Louis?

Yes. We have seen non-stop flights on this route, flown by United Airlines.

Which airlines fly from San Francisco to St Louis?

These are the carriers we have seen on the route: United Airlines, Alaska Airlines, Frontier Airlines, Southwest Airlines.

How long does the flight from San Francisco to St Louis take?

The average journey time across the 27 fares we observed is 15h 45m, including any stops. Individual departures vary; the fastest observed flight is listed in the route facts above.

How many of the observed San Francisco to St Louis fares were non-stop?

3 of the 28 fares we observed were non-stop; the rest included at least one stop. That describes our observations, not every flight that operates.

How observed prices work, what "No data" means and what a fare includes: Read the flight price guide