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Cheap flights from San Francisco to St. Louis from $52

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 3/3. 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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0 bags

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Find the cheapest flights from San Francisco to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:58 am - 10:02 am
SFO
-
STL
23h 04m1 stop
Frontier Logo
3:46 pm - 11:41 pm
STL
-
SFO
9h 55m1 stop
$132Frontier
Fri, Jan 9 - Sat, Jan 31
Frontier Logo
8:58 am - 10:02 am
SFO
-
STL
23h 04m1 stop
Frontier Logo
3:43 pm - 8:46 pm
STL
-
SFO
7h 03m1 stop
$133Frontier
Fri, Jan 9 - Wed, Jan 14
Frontier Logo
6:05 am - 10:02 am
SFO
-
STL
25h 57m1 stop
Frontier Logo
3:43 pm - 8:46 pm
STL
-
SFO
7h 03m1 stop
$139Frontier
Sun, Jan 11 - Sat, Jan 17
Frontier Logo
6:05 am - 10:02 am
SFO
-
STL
25h 57m1 stop
Frontier Logo
3:43 pm - 8:46 pm
STL
-
SFO
7h 03m1 stop
$143Frontier
Sun, Jan 11 - Sat, Jan 17
Frontier Logo
10:16 am - 10:02 am
SFO
-
STL
21h 46m2 stops
Frontier Logo
3:46 pm - 11:41 pm
STL
-
SFO
9h 55m1 stop
$144Frontier
Fri, Jan 9 - Sat, Jan 31
Frontier Logo
10:16 am - 10:02 am
SFO
-
STL
21h 46m2 stops
Frontier Logo
3:43 pm - 8:46 pm
STL
-
SFO
7h 03m1 stop
$145Frontier
Fri, Jan 9 - Wed, Jan 14
Frontier Logo
7:00 am - 2:46 pm
SFO
-
STL
5h 46m1 stop
Frontier Logo
3:46 pm - 11:41 pm
STL
-
SFO
9h 55m1 stop
$148Frontier
Wed, Feb 4 - Wed, Feb 4
Frontier Logo
4:48 pm - 10:02 am
SFO
-
STL
15h 14m2 stops
Frontier Logo
3:43 pm - 8:46 pm
STL
-
SFO
7h 03m1 stop
$151Frontier
Tue, Jan 6 - Wed, Jan 14
Frontier Logo
12:49 pm - 12:12 pm
SFO
-
STL
21h 23m1 stop
Frontier Logo
3:43 pm - 8:46 pm
STL
-
SFO
7h 03m1 stop
$155Frontier
Wed, Jan 7 - Wed, Jan 14
Frontier Logo
6:54 pm - 10:02 am
SFO
-
STL
37h 08m2 stops
Frontier Logo
3:43 pm - 8:46 pm
STL
-
SFO
7h 03m1 stop
$157Frontier
Wed, Jan 7 - Wed, Jan 14

Frontier flights from San Francisco to St. Louis

Our best Frontier deals on San Francisco to St. Louis flight tickets
Frontier
Jan 9
SFO8:58 amSan Francisco
23h 04m
1 stop
STL10:02 amLambert-St Louis
Jan 31
STL3:46 pmLambert-St Louis
9h 55m
1 stop
SFO11:41 pmSan Francisco
$132
Find similar
Frontier
Jan 9
SFO8:58 amSan Francisco
23h 04m
1 stop
STL10:02 amLambert-St Louis
Jan 14
STL3:43 pmLambert-St Louis
7h 03m
1 stop
SFO8:46 pmSan Francisco
$133
Find similar
Frontier
Jan 11
SFO6:05 amSan Francisco
25h 57m
1 stop
STL10:02 amLambert-St Louis
Jan 17
STL3:43 pmLambert-St Louis
7h 03m
1 stop
SFO8:46 pmSan Francisco
$139
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 December 4, 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

Fri 1/9

8:58 am-10:02 am

1 stop23h 04m

Lambert-St Louis

Sat 1/31

3:46 pm-11:41 pm

1 stop9h 55m

$132

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Fri 1/9

8:58 am-10:02 am

1 stop23h 04m

Lambert-St Louis

Wed 1/14

3:43 pm-8:46 pm

1 stop7h 03m

$133

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Sun 1/11

6:05 am-10:02 am

1 stop25h 57m

Lambert-St Louis

Sat 1/17

3:43 pm-8:46 pm

1 stop7h 03m

$139

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Sun 1/11

6:05 am-10:02 am

1 stop25h 57m

Lambert-St Louis

Sat 1/17

3:43 pm-8:46 pm

1 stop7h 03m

$143

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Fri 1/9

10:16 am-10:02 am

2 stops21h 46m

Lambert-St Louis

Sat 1/31

3:46 pm-11:41 pm

1 stop9h 55m

$144

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Fri 1/9

10:16 am-10:02 am

2 stops21h 46m

Lambert-St Louis

Wed 1/14

3:43 pm-8:46 pm

1 stop7h 03m

$145

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Wed 2/4

7:00 am-2:46 pm

1 stop5h 46m

Lambert-St Louis

Wed 2/4

3:46 pm-11:41 pm

1 stop9h 55m

$148

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Tue 1/6

4:48 pm-10:02 am

2 stops15h 14m

Lambert-St Louis

Wed 1/14

3:43 pm-8:46 pm

1 stop7h 03m

$151

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Wed 1/7

12:49 pm-12:12 pm

1 stop21h 23m

Lambert-St Louis

Wed 1/14

3:43 pm-8:46 pm

1 stop7h 03m

$155

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Wed 1/7

6:54 pm-10:02 am

2 stops37h 08m

Lambert-St Louis

Wed 1/14

3:43 pm-8:46 pm

1 stop7h 03m

$157

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, February 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 $339. The month of January is another great option to travel to St. Louis, with average flight prices from San Francisco averaging around $349.

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 $426. 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 Monday because tickets tend to average around $494. 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 $412 when looking at flights departing at noon. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $453 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 $414 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 $336 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 December 2025, prices for San Francisco to St. Louis flights are approximately 8% more expensive 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

$238

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 $238. The best round-trip flight deal from San Francisco to St. Louis found on momondo in the last 72 hours is $448.
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. 4h 11m 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 $130Free CancellationRating
5.8
3,091 reviews
Search Frontier flights
American AirlinesPriceFrom $202Free CancellationRating
7.2
11,047 reviews
Search American Airlines flights
DeltaPriceFrom $208Free CancellationRating
7.9
8,011 reviews
Search Delta flights
United AirlinesPriceFrom $289Free CancellationRating
7.4
9,066 reviews
Search United Airlines flights
SouthwestPriceFrom $307Free CancellationRating
8.0
4,250 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 $307. Generally, Southwest has 5 flights on this route every week with an average price of $477. 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, 9,066 ratings). United Airlines flies from San Francisco to St. Louis around 5 times per week, with deals starting from $289 round-trip and rising to an average price of around $447.

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
O'Fallon
Florissant
Fenton
Wentzville
Collinsville
St. Peters
Alton
Farmington
Clayton
Festus
Glencoe
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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