Cheap Flights from St Louis (STL) to San Francisco (SFO)

Compare St Louis to San Francisco International flight deals

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Flight deals from St Louis to San Francisco International

Looking for a cheap last-minute deal or the best return flight from St Louis Airport to San Francisco International Airport? If you want to travel next month, return fares start from $310. Find the lowest prices on one-way and return tickets right here.

San Francisco.$296 per passenger.Departing Wed, 30 Sep, returning Sat, 3 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Wed, 30 Sep, arriving in San Francisco International.Inbound indirect flight with Frontier Airlines, departs from San Francisco International on Sat, 3 Oct, arriving in St Louis.Price includes taxes and charges.From $296, select.

San Francisco.$310 per passenger.Departing Fri, 2 Oct, returning Tue, 6 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Fri, 2 Oct, arriving in San Francisco International.Inbound indirect flight with Frontier Airlines, departs from San Francisco International on Tue, 6 Oct, arriving in St Louis.Price includes taxes and charges.From $310, select.

San Francisco.$372 per passenger.Departing Sat, 26 Sep, returning Wed, 30 Sep.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Sat, 26 Sep, arriving in San Francisco International.Inbound indirect flight with Frontier Airlines, departs from San Francisco International on Wed, 30 Sep, arriving in St Louis.Price includes taxes and charges.From $372, select.

San Francisco.$410 per passenger.Departing Thu, 29 Oct, returning Mon, 2 Nov.Return flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Thu, 29 Oct, arriving in San Francisco International.Inbound indirect flight with Delta, departs from San Francisco International on Mon, 2 Nov, arriving in St Louis.Price includes taxes and charges.From $410, select.

San Francisco.$412 per passenger.Departing Sat, 7 Nov, returning Mon, 9 Nov.Return flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Sat, 7 Nov, arriving in San Francisco International.Inbound indirect flight with Delta, departs from San Francisco International on Mon, 9 Nov, arriving in St Louis.Price includes taxes and charges.From $412, select.

San Francisco.$420 per passenger.Departing Fri, 11 Dec, returning Sat, 9 Jan.Return flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Fri, 11 Dec, arriving in San Francisco International.Inbound indirect flight with Delta, departs from San Francisco International on Sat, 9 Jan, arriving in St Louis.Price includes taxes and charges.From $420, select.

San Francisco.$435 per passenger.Departing Thu, 7 Jan, returning Sat, 9 Jan.Return flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Thu, 7 Jan, arriving in San Francisco International.Inbound indirect flight with Delta, departs from San Francisco International on Sat, 9 Jan, arriving in St Louis.Price includes taxes and charges.From $435, select.

San Francisco.$502 per passenger.Departing Wed, 17 Feb, returning Wed, 24 Feb.Return flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Wed, 17 Feb, arriving in San Francisco International.Inbound indirect flight with Delta, departs from San Francisco International on Wed, 24 Feb, arriving in St Louis.Price includes taxes and charges.From $502, select.

San Francisco.$551 per passenger.Departing Thu, 11 Feb, returning Thu, 18 Feb.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Thu, 11 Feb, arriving in San Francisco International.Inbound direct flight with Southwest Airlines departs from San Francisco International on Thu, 18 Feb, arriving in St Louis.Price includes taxes and charges.From $551, select.

San Francisco.$551 per passenger.Departing Thu, 12 Nov, returning Tue, 17 Nov.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Thu, 12 Nov, arriving in San Francisco International.Inbound direct flight with Southwest Airlines departs from San Francisco International on Tue, 17 Nov, arriving in St Louis.Price includes taxes and charges.From $551, select.

San Francisco.$552 per passenger.Departing Sat, 31 Oct, returning Sat, 7 Nov.Return flight with United.Outbound direct flight with United departs from St Louis on Sat, 31 Oct, arriving in San Francisco International.Inbound direct flight with United departs from San Francisco International on Sat, 7 Nov, arriving in St Louis.Price includes taxes and charges.From $552, select.

San Francisco.$570 per passenger.Departing Sat, 16 Jan, returning Sat, 30 Jan.Return flight with United.Outbound direct flight with United departs from St Louis on Sat, 16 Jan, arriving in San Francisco International.Inbound direct flight with United departs from San Francisco International on Sat, 30 Jan, arriving in St Louis.Price includes taxes and charges.From $570, select.

San Francisco.$570 per passenger.Departing Sat, 26 Sep, returning Sat, 10 Oct.Return flight with United.Outbound direct flight with United departs from St Louis on Sat, 26 Sep, arriving in San Francisco International.Inbound direct flight with United departs from San Francisco International on Sat, 10 Oct, arriving in St Louis.Price includes taxes and charges.From $570, select.

San Francisco.$570 per passenger.Departing Wed, 23 Sep, returning Wed, 30 Sep.Return flight with United.Outbound direct flight with United departs from St Louis on Wed, 23 Sep, arriving in San Francisco International.Inbound direct flight with United departs from San Francisco International on Wed, 30 Sep, arriving in St Louis.Price includes taxes and charges.From $570, select.

San Francisco.$570 per passenger.Departing Tue, 17 Nov, returning Tue, 1 Dec.Return flight with United.Outbound direct flight with United departs from St Louis on Tue, 17 Nov, arriving in San Francisco International.Inbound direct flight with United departs from San Francisco International on Tue, 1 Dec, arriving in St Louis.Price includes taxes and charges.From $570, select.

San Francisco.$570 per passenger.Departing Sat, 10 Oct, returning Tue, 13 Oct.Return flight with United.Outbound direct flight with United departs from St Louis on Sat, 10 Oct, arriving in San Francisco International.Inbound direct flight with United departs from San Francisco International on Tue, 13 Oct, arriving in St Louis.Price includes taxes and charges.From $570, select.

Find the cheapest month to fly from St Louis to San Francisco International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like St Louis to San Francisco International flights are currently cheapest in October.

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Direct flights from St Louis to San Francisco International

St Louis to San Francisco International: Alternative routes

Compare routes from St Louis to San Francisco below. You may find an airport to fly into that's cheaper, faster, or easier than San Francisco International.

St Louis to San Francisco: Flight information

The things to know before you go.

Cheapest flight found	$296
Cheapest month to fly	September
Average flight time	4 hrs, 30 mins
Most popular airline	Southwest Airlines
Average flights per week	39

Finding cheap flights from St Louis to San Francisco International: Frequently asked questions

How much are return flights from St Louis to San Francisco International?

The best price we found for a return flight from St Louis to San Francisco International is $296. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

How long does it take to fly from St Louis to San Francisco International?

4 hours and 30 minutes is the average flight time from St Louis to San Francisco International.

Which airlines fly direct from St Louis to San Francisco International?

Southwest Airlines, United and Air New Zealand fly direct from St Louis to San Francisco International.

How many flights are there a week from St Louis to San Francisco International?

As of September 2026, there are 40 flights per week flying from St Louis to San Francisco International.

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

The cheapest month to fly from St Louis to San Francisco International is usually September.

Which upcoming date is cheapest to fly from St Louis Airport to San Francisco International Airport on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to San Francisco International Airport on Wednesday, 30 September 2026.

Can I get a direct flight from St Louis Airport to San Francisco International Airport?

Yes – the average flight time is 4 hours and 30 minutes.

How can I find the best flight deal to San Francisco International?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to San Francisco International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to San Francisco?

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to San Francisco is around 40 days in advance, so don’t leave your flight to the last minute.

Which is the cheapest airline to fly from St Louis Airport to San Francisco International with?

Currently, Frontier Airlines and Southwest Airlines offer the cheapest flight tickets to San Francisco International.

Flying from St Louis Airport (STL) to San Francisco International Airport (SFO): what you need to know

Book a direct flight from St Louis Airport to San Francisco International Airport and you'll be travelling for an average of 4 hours 25 minutes.
San Francisco's timezone is UTC-8, making San Francisco two hours behind St Louis.
Flights from STL to SFO start from 06:00 — the first with United Airlines. The last departure is at 21:30 with Southwest Airlines. Overall, there are 11 weekly St Louis Airport to San Francisco International Airport flights.
Your STL to SFO flight won't wait if you're late, so show up at the airport on time. Arrive up to one hour in advance for domestic flights and two hours ahead for international travel.
Travelling during a peak month like July? Public holidays and other popular seasons can mean longer queues and delays at airport checkpoints. Play it safe and get there up to four hours before international flights and two hours before a domestic departure.
United has direct flights from St Louis Airport to San Francisco International Airport. Book with this popular carrier, then get ready to tick off the sights in San Francisco — and maybe even more of the United States if you have time.
United is the airline most travellers choose to fly with on this route.
The most punctual carrier operating STL to SFO flights is United. Its services arrive without delay 78.2% of the time.
Think about adding a stopover when booking your ticket from St Louis Airport to San Francisco International Airport. Just uncheck 'Direct flights only' to break up your journey, or visit a new city along the way. Here are some options between STL and SFO:
- Denver International Airport
- Los Angeles International Airport
- Harry Reid International Airport

How to find the cheapest flights from St Louis Airport (STL) to San Francisco International Airport (SFO)

$124 is the lowest price for a one-way St Louis Airport to San Francisco International Airport flight. A return flight starts from $296. These prices can change depending on availability.
To pick up cheap tickets from STL to SFO, book your trip 11 months before your departure.
The cheapest month for flights from St Louis Airport to San Francisco International Airport is April. Use the 'Whole month' tool to find the lowest airfares if you have flexible dates.
Save time looking for cheap flights from STL to SFO by setting up a Price Alert. You'll get an email or push notification on the app when a lower fare pops up.
Select your preferred departure and arrival times, airlines and number of stops with the filters. Alternatively, sort your results by 'Cheapest' to get the best deals on flights from St Louis Airport to San Francisco International Airport.

Handy information about St Louis Airport (STL)

You'll find STL at 10701 Lambert International Blvd..
When it comes to St Louis Airport's on-time performance, 76% of flights arrive within the scheduled timeframe.
Central St Louis to St Louis Airport is approximately 24 kilometres. Depending on traffic, it'll take you about 25 minutes to get there if you're catching a taxi, ride-sharing or driving.
Taking public transport? Expect a journey time of around 30 minutes.
Have an early flight from St Louis Airport to San Francisco International Airport? Avoid the last-minute rush to the terminal (and enjoy a little extra shut-eye) by picking one of these stays close to STL:

Arriving at San Francisco International Airport (SFO)

If you're landing on a late St Louis Airport to San Francisco International Airport flight, few things top the convenience of being near the terminal. Grab your suitcases from the carousel and then be showered and relaxing not long after at one of these hotels near SFO:
Get your adventure underway by picking up a San Francisco International Airport rental car. Grab a set of wheels from Dollar, Thrifty or Hertz and experience the lesser-explored corners of San Francisco and beyond.
Reserving your ride from San Francisco International Airport about one week ahead increases your chances of getting a good deal.

When to fly to San Francisco International Airport (SFO)

It's time to choose your dates for your flight from St Louis Airport to San Francisco International Airport. July is the most popular month to head to San Francisco. If you'd like a quieter vibe, go in March.
Before locking in your flight from St Louis Airport to San Francisco International Airport, think about the kind of weather you enjoy. September is the warmest month in San Francisco, with temperatures ranging from 12ºC (54ºF) to 24ºC (75ºF).
Search for cheap tickets from STL to SFO in January if you want to travel in cooler conditions. Temperatures are at their lowest around then, ranging between 5ºC (41ºF) and 16ºC (61ºF) on average.

Explore more of the United States

You've visited San Francisco, now it's time to discover other parts of the United States. Travel around 64 kilometres south-east to San Jose to check off its popular sights. From Winchester Mystery House to The Tech Interactive and Santa Clara Valley, there's plenty to keep you on the go.
Around 257 kilometres south-east of San Francisco, Fresno is another essential stop in the United States. Experience this destination's highlights firsthand at Forestiere Underground Gardens, Shinzen Japanese Garden and Fresno Chaffee Zoo.