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Cheap flights from San Francisco to St. Louis from $138

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from San Francisco to St. Louis departing on 10/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from San Francisco to St. Louis

Cheap round-trip flights

Frontier Logo
11:00 pm - 3:04 pmSFO-STL
14h 04m1 stop
Frontier Logo
7:55 pm - 12:16 amSTL-SFO
6h 21m1 stop
$239Frontier
Find Deal
Sat, Sep 13 - Mon, Sep 15
Frontier Logo
1:29 pm - 9:07 amSFO-STL
17h 38m2 stops
Frontier Logo
4:51 pm - 9:29 pmSTL-SFO
6h 38m1 stop
$240Frontier
Find Deal
Mon, Oct 20 - Sat, Oct 25
Frontier Logo
11:57 pm - 9:06 amSFO-STL
31h 09m2 stops
Frontier Logo
7:55 pm - 12:16 amSTL-SFO
6h 21m1 stop
$241Frontier
Find Deal
Sun, Sep 14 - Mon, Sep 29
Frontier Logo
7:07 pm - 9:06 amSFO-STL
11h 59m1 stop
Frontier Logo
7:55 pm - 12:16 amSTL-SFO
6h 21m1 stop
$242Frontier
Find Deal
Thu, Sep 18 - Mon, Sep 22
Frontier Logo
1:15 pm - 9:06 amSFO-STL
17h 51m1 stop
Frontier Logo
7:55 pm - 9:50 amSTL-SFO
15h 55m2 stops
$243Frontier
Find Deal
Fri, Sep 5 - Fri, Sep 12
Frontier Logo
6:59 pm - 9:07 amSFO-STL
12h 08m2 stops
Frontier Logo
4:51 pm - 9:29 pmSTL-SFO
6h 38m1 stop
$245Frontier
Find Deal
Thu, Oct 23 - Sat, Oct 25
Frontier Logo
8:00 am - 3:56 pmSFO-STL
5h 56m1 stop
Frontier Logo
10:18 am - 9:23 pmSTL-SFO
13h 05m2 stops
$246Frontier
Find Deal
Sat, Oct 25 - Mon, Oct 27
Frontier Logo
2:17 pm - 9:06 amSFO-STL
16h 49m2 stops
Frontier Logo
7:55 pm - 12:16 amSTL-SFO
6h 21m1 stop
$248Frontier
Find Deal
Thu, Sep 18 - Mon, Sep 22
Logo
1:15 pm - 9:06 amSFO-STL
17h 51m1 stop
Logo
6:30 pm - 12:04 amSTL-SFO
7h 34m1 stop
$257
Find Deal
Fri, Sep 12 - Fri, Sep 19
Delta Logo
8:00 pm - 8:51 amSFO-STL
10h 51m2 stops
Delta Logo
6:00 am - 7:05 pmSTL-SFO
15h 05m2 stops
$294Delta
Find Deal
Sat, Oct 18 - Sat, Oct 25

Frontier flights from San Francisco to St. Louis

Our best Frontier deals on San Francisco to St. Louis flight tickets
Frontier
Sep 13
SFO11:00 pmSan Francisco
14h 04m
1 stop
STL3:04 pmLambert-St Louis
Sep 15
STL7:55 pmLambert-St Louis
6h 21m
1 stop
SFO12:16 amSan Francisco
$239
Find similar
Frontier
Oct 20
SFO1:29 pmSan Francisco
17h 38m
2 stops
STL9:07 amLambert-St Louis
Oct 25
STL4:51 pmLambert-St Louis
6h 38m
1 stop
SFO9:29 pmSan Francisco
$240
Find similar
Frontier
Sep 14
SFO11:57 pmSan Francisco
31h 09m
2 stops
STL9:06 amLambert-St Louis
Sep 29
STL7:55 pmLambert-St Louis
6h 21m
1 stop
SFO12:16 amSan Francisco
$241
Find similar

Alaska Airlines flights from San Francisco to St. Louis

Our best Alaska Airlines deals on San Francisco to St. Louis flight tickets
Alaska Airlines
Sep 4
SFO8:00 amSan Francisco
7h 34m
1 stop
STL5:34 pmLambert-St Louis
Sep 9
STL6:00 amLambert-St Louis
10h 23m
2 stops
SFO2:23 pmSan Francisco
$515
Find similar
Alaska Airlines
Sep 4
SFO11:12 amSan Francisco
10h 47m
2 stops
STL11:59 pmLambert-St Louis
Sep 9
STL3:35 pmLambert-St Louis
7h 45m
1 stop
SFO9:20 pmSan Francisco
$577
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from San Francisco to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated August 26, 2025.
Use the filters below to find and compare flights from San Francisco to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Sat 9/13

11:00 pm-3:04 pm

1 stop14h 04m

Lambert-St Louis

Mon 9/15

7:55 pm-12:16 am

1 stop6h 21m

$239

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Mon 10/20

1:29 pm-9:07 am

2 stops17h 38m

Lambert-St Louis

Sat 10/25

4:51 pm-9:29 pm

1 stop6h 38m

$240

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Sun 9/14

11:57 pm-9:06 am

2 stops31h 09m

Lambert-St Louis

Mon 9/29

7:55 pm-12:16 am

1 stop6h 21m

$241

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Thu 9/18

7:07 pm-9:06 am

1 stop11h 59m

Lambert-St Louis

Mon 9/22

7:55 pm-12:16 am

1 stop6h 21m

$242

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Fri 9/5

1:15 pm-9:06 am

1 stop17h 51m

Lambert-St Louis

Fri 9/12

7:55 pm-9:50 am

2 stops15h 55m

$243

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Thu 10/23

6:59 pm-9:07 am

2 stops12h 08m

Lambert-St Louis

Sat 10/25

4:51 pm-9:29 pm

1 stop6h 38m

$245

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Sat 10/25

8:00 am-3:56 pm

1 stop5h 56m

Lambert-St Louis

Mon 10/27

10:18 am-9:23 pm

2 stops13h 05m

$246

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Thu 9/18

2:17 pm-9:06 am

2 stops16h 49m

Lambert-St Louis

Mon 9/22

7:55 pm-12:16 am

1 stop6h 21m

$248

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Fri 9/12

1:15 pm-9:06 am

1 stop17h 51m

Lambert-St Louis

Fri 9/19

6:30 pm-12:04 am

1 stop7h 34m

$257

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Sat 10/18

8:00 pm-8:51 am

2 stops10h 51m

Lambert-St Louis

Sat 10/25

6:00 am-7:05 pm

2 stops15h 05m

$294

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to St. Louis from

How to get the cheapest flight ticket from San Francisco to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to St. Louis?

In general, January is the cheapest month to fly from San Francisco to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $328. The month of February is another great option to travel to St. Louis, with average flight prices from San Francisco averaging around $339.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Tuesday when prices can be found for as low as $419. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $465. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from San Francisco at noon is the least expensive time of day to depart. momondo users have found prices as low as $409 when looking at flights departing at noon. In the afternoon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $450 per ticket.

What is the cheapest San Francisco to Lambert-St Louis flight route?

Fly from San Francisco to Lambert-St Louis for the best San Francisco - Lambert-St Louis flight prices

How far in advance should I book a flight to St. Louis?

You are more likely to see cheaper flights to St. Louis from San Francisco when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $403 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from San Francisco for as low as $340 on momondo.

What cabin class options are available on San Francisco to Lambert-St Louis flights?

There are 4 cabin classes available to choose from on San Francisco to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on San Francisco to St. Louis flights?

No. A direct flight is the cheapest option for a flight between San Francisco to St. Louis.

How have San Francisco to St. Louis flight prices changed over time?

As of August 2025, prices for San Francisco to St. Louis flights are approximately 2% cheaper when compared to flights at the same time last year.

When to book flights from San Francisco to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from San Francisco to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap San Francisco to St. Louis (SFO to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from San Francisco to St. Louis

Best Price Found

$193

Fastest flight time

3h 40m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from San Francisco in the past 72 hours is $193. The best round-trip flight deal from San Francisco to St. Louis found on momondo in the last 72 hours is $329.
The fastest flight from San Francisco to St. Louis takes 3h 40m
Direct flights go from San Francisco to St. Louis every day.
There is 1 airport near St. Louis: Lambert-St Louis (STL)
Search flight deals

  • How far is San Francisco to Lambert-St Louis by plane?

    The straight-line distance from San Francisco to Lambert-St Louis is 1739.7 mi. 5h 56m is a normal flight duration for this route.

  • When did momondo last update prices for flights from San Francisco Airport to Lambert-St Louis Airport?

    Prices for flights from San Francisco Airport to Lambert-St Louis Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from San Francisco Airport to Lambert-St Louis Airport?

  • How old do you have to be to fly from San Francisco Airport to Lambert-St Louis Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from San Francisco Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents you'll need for your trip to Lambert-St Louis Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from San Francisco to St. Louis?

  • What is the most popular airline from San Francisco to St. Louis?

Best airlines flying from San Francisco to St. Louis

Compare and see reviews for airlines that fly from San Francisco to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $110Free CancellationRating
5.8
3,200 reviews
Search Frontier flights
DeltaPriceFrom $189Free CancellationRating
7.9
7,979 reviews
Search Delta flights
American AirlinesPriceFrom $236Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $290Free CancellationRating
7.4
8,943 reviews
Search United Airlines flights
SouthwestPriceFrom $306Free CancellationRating
8.0
4,243 reviews
Search Southwest flights

  • Southwest Flights From San Francisco to St. Louis

    The lowest priced Southwest flight from San Francisco to St. Louis from the last 72 hours was $306. Generally, Southwest has 8 flights on this route every week with an average price of $448. Southwest is rated 8.0/10 by our users.

  • United Airlines Flights From San Francisco to St. Louis

    Another popular option for San Francisco to St. Louis flights is United Airlines (7.4/10, 8,943 ratings). United Airlines flies from San Francisco to St. Louis around 6 times per week, with deals starting from $290 round-trip and rising to an average price of around $437.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
Florissant
O'Fallon
Fenton
Collinsville
Wentzville
Alton
St. Peters
Farmington
Festus
Glencoe
Clayton
Edwardsville
Eureka
Litchfield
Shrewsbury

Why use momondo?

Why should I use momondo to find a flight deal from San Francisco to St. Louis?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from San Francisco to St. Louis for you.

Can I find flights from San Francisco to St. Louis with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for San Francisco to St. Louis flights to just show those with flexible booking policies.

How can momondo help me find flights from San Francisco to St. Louis?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to St. Louis from San Francisco.

I’m not ready to book a flight from San Francisco to St. Louis right now. Can momondo alert me if prices change?

Price alerts on flights to St. Louis from San Francisco are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
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