St. Louis

$139+ Cheap flights from San Francisco to St. Louis (SFO - STL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/16. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — STL
Jul 26 — Aug 21
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Cheapflights Tip: The best prices from San Francisco to Lambert-St Louis are usually found in January or February, booked 35 days in advance, depart on a Tuesday or Saturday and return on a Thursday

Cheap flight deals from San Francisco to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from San Francisco (SFO) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 21, 2025.

Round-trip from

$285
(Sun Country Air)

One-way from

$139
(Alaska Airlines)

Popular in

June

Cheapest in

January

Average price

$409

Good round-trip deal

$398 or less

Good one-way deal

$179 or less
From San Francisco to Lambert-St Louis
One-way flight from San Francisco to Lambert-St Louis
Highest demand for flights based on searches. 7% potential increase in price ($32 potential increase over avg. RT price).
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Average for round-trip flights in July 2025
Price to beat on a round-trip flight from San Francisco to Lambert-St Louis.
Price to beat on a one-way flight from San Francisco to Lambert-St Louis.

Find flight deals from San Francisco to St. Louis

Cheapest flights from San Francisco to St. Louis
Explore the most affordable flight options available from San Francisco to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 21, 2025.

This Sun Country Air deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/1411:59 pmSFO - STL
1 stop9h 31mSun Country Air
Sun 8/178:00 amSTL - SFO
1 stop26h 08mSun Country Air
Deal found 7/20$285
This Alaska Airlines deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/239:59 pmSFO - STL
2 stops17h 35mAlaska Airlines
Tue 9/303:35 pmSTL - SFO
1 stop7h 45mAlaska Airlines
Deal found 7/19$289
This FlightHub deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/137:00 amSFO - STL
1 stop28h 42mFrontier
Wed 8/207:54 pmSTL - SFO
1 stop17h 35mFrontier
Deal found 7/19$301
This Southwest deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/191:45 pmSFO - STL
Nonstop3h 50mSouthwest
Tue 8/269:10 amSTL - SFO
Nonstop4h 10mSouthwest
Deal found 7/20$306
This American Airlines deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/138:00 amSFO - STL
1 stop10h 32mAmerican Airlines
Mon 9/156:18 pmSTL - SFO
1 stop6h 06mAmerican Airlines
Deal found 7/19$313
This United Airlines deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/1310:35 amSFO - STL
Nonstop3h 54mUnited Airlines
Tue 12/165:30 pmSTL - SFO
Nonstop4h 38mUnited Airlines
Deal found 7/20$319
This Flightnetwork deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/176:52 pmSFO - STL
1 stop16h 50mMultiple Airlines
Sun 8/245:10 pmSTL - SFO
1 stop16h 56mMultiple Airlines
Deal found 7/20$322
This Delta deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1112:40 amSFO - STL
1 stop5h 54mDelta
Mon 8/187:11 pmSTL - SFO
1 stop6h 37mDelta
Deal found 7/19$326

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated July 21, 2025.
Use the filters below to find and compare flights from San Francisco to St. Louis that are best for you.

Fly from

San Francisco

Fly to

St. Louis

Route

Depart

Return

Price

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Thu 8/14

11:59 pm-11:30 am

1 stop9h 31m

Lambert-St Louis

Sun 8/17

8:00 am-8:08 am

1 stop26h 08m

$285

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Tue 9/23

9:59 pm-5:34 pm

2 stops17h 35m

Lambert-St Louis

Tue 9/30

3:35 pm-9:20 pm

1 stop7h 45m

$289

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Wed 8/13

7:00 am-1:42 pm

1 stop28h 42m

Lambert-St Louis

Wed 8/20

7:54 pm-11:29 am

1 stop17h 35m

$301

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Tue 8/19

1:45 pm-7:35 pm

Nonstop3h 50m

Lambert-St Louis

Tue 8/26

9:10 am-11:20 am

Nonstop4h 10m

$306

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Sat 9/13

8:00 am-8:32 pm

1 stop10h 32m

Lambert-St Louis

Mon 9/15

6:18 pm-10:24 pm

1 stop6h 06m

$313

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Sat 8/23

10:51 am-4:53 pm

Nonstop4h 02m

Lambert-St Louis

Wed 8/27

5:49 pm-8:10 pm

Nonstop4h 21m

$319

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Sun 8/17

6:52 pm-1:42 pm

1 stop16h 50m

Lambert-St Louis

Sun 8/24

5:10 pm-8:06 am

1 stop16h 56m

$322

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Mon 8/11

12:40 am-8:34 am

1 stop5h 54m

Lambert-St Louis

Mon 8/18

7:11 pm-11:48 pm

1 stop6h 37m

$326

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Tue 9/16

6:00 am-5:34 pm

1 stop9h 34m

$139

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Thu 9/11

6:18 pm-11:21 am

1 stop15h 03m

$140

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/20

Showing 1-10 of 16 results
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The best insider tips for San Francisco to St. Louis flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your San Francisco to St. Louis trip
Airports
SFO

Save time at SFO by using the AirTrain Red Line to quickly navigate between terminals and security checkpoints.

Read more about SFOby Harriet Baskas
STL

Use the MetroLink light rail for a convenient and economical trip from STL to downtown St. Louis in about 40 minutes.

Read more about STLby Taryn White
Our travel experts
Taryn White

Taryn White

Expert on STL

Taryn White

Taryn White

Taryn White is a freelance travel writer, digital creator, and travel advisor who has visited nearly 100 countries and all 50 states. She’s familiar with many airports and enjoys beach hopping, boutique hotels, spa experiences, and exploring local culture. Her work has appeared in Travel + Leisure, Condé Nast Traveler, National Geographic, Smithsonian Magazine, AFAR, and more.

Read more
Harriet Baskas

Harriet Baskas

Expert on SFO

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more

Best time to book a flight from San Francisco to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from San Francisco with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from San Francisco to St. Louis

How far ahead should I book a flight from San Francisco to St. Louis?

Use this chart to determine the optimal time to book a round-trip flight from San Francisco to St. Louis. Price data was last updated on July 18, 2025.

To ensure you get the cheapest price possible for a flight from San Francisco to St. Louis, you should look to book at least 35 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from San Francisco to St. Louis?

Currently, August is the cheapest month in which you can book a flight from San Francisco to St. Louis (average of $311). Flying from San Francisco to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SFO to STL?

Find hourly flight availability from San Francisco to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 21, 2025.

It’s optimal to fly from San Francisco to St. Louis at noon. By choosing this option you can save up to 9% on the cost of your flight, compared to a flight in the afternoon.

What is the cheapest day to fly from San Francisco to St. Louis?

Use this chart to determine the cheapest time to fly round-trip from San Francisco to St. Louis. Price data was last updated on July 20, 2025.

Travelers seeking maximum savings on their San Francisco to St. Louis flight should consider departing on Tuesday evenings when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from San Francisco to St. Louis

Explore weekly flight availability from San Francisco to St. Louis. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 21, 2025.

The most flights from SFO to STL are scheduled on a Monday (7 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (2 on average).

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated July 21, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest, and Delta from San Francisco to St. Louis. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Overall

8.0

Boarding

8.1

Food

7.1

Entertainment

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Overall

8.0

Boarding

8.1

Food

7.1

Entertainment

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Overall

8.0

Boarding

8.1

Food

7.1

Entertainment

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
8.0
Very good

Overall

8.0

Boarding

8.1

Food

7.1

Entertainment

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Overall

8.0

Boarding

8.1

Food

7.1

Entertainment

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Overall

8.0

Boarding

8.1

Food

7.1

Entertainment

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Related info for your journey

Find useful and relevant information for your journey from San Francisco to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • What airports do I use to fly from San Francisco to St. Louis?

    You will need to book a flight from San Francisco to Lambert-St Louis if you want to fly from San Francisco to St. Louis. At least 5 different airlines have flights from San Francisco (SFO) to Lambert-St Louis (STL) on a regular basis. There are 5 flights to St. Louis from the San Francisco airport per day. If you manage to book one that is nonstop, then you can expect the flight time from SFO to STL to be around 3h 45m.

  • How popular is this San Francisco to St. Louis flight route?

  • What are the cheapest airlines flying from San Francisco to St. Louis round-trip?

    Currently priced at $285, Sun Country Air will fly you from San Francisco to St. Louis and back. In addition to Sun Country Air, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Alaska Airlines and Frontier - these airlines can fly you to your destination from $289 and $301, respectively. Users have found that Sun Country Air is 28% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from San Francisco to St. Louis one-way?

    One-way options have recently been found by users for as low as $139 on Alaska Airlines. Other airlines that offer cheap prices include Sun Country Air from $140 and American Airlines from $144 one-way.

  • What are the most reliable airlines from San Francisco to St. Louis?

    Before booking your flight to St. Louis from San Francisco, check out the most reliable airlines to get you to your destination on time: Air New Zealand (76%), United Airlines (76%), Asiana Airlines( 73%).

  • What are the cheapest flights from San Francisco to St. Louis?

    On average you can expect to pay $357 for a flight from San Francisco to St. Louis. The cheapest flight overall is $101 while the most popular route, (San Francisco - Lambert-St Louis) is currently priced at $278.

  • Where are the most common layover locations when flying from San Francisco to St. Louis?

  • What are some popular things to do or see while on a layover in Salt Lake City?

    If you're on a layover in Salt Lake City and looking for things to do, consider visiting Temple Square, Salt Lake Temple, or Hogle Zoo. Those on a layover in Salt Lake City interested in visiting Temple Square, Salt Lake Temple, or Hogle Zoo can do so by traveling 4.7 mi, 4.8 mi, and 9.1 mi, respectively from Salt Lake City. Those on a layover in Salt Lake City in need of a rental car can book one at Salt Lake City for about $59.

  • Where are the least popular layover locations for San Francisco to St. Louis flights?

  • Can I find deals for flights from San Francisco to St. Louis that include hotel bookings?

    Yes. In addition to deals on San Francisco to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from San Francisco to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Francisco to St. Louis.

  • Can I find deals for business class flights from San Francisco to St. Louis?

    Yes. Cheapflights offers flight deals from San Francisco to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from San Francisco to St. Louis?

    Currently, August is the cheapest month in which you can book a flight from San Francisco to St. Louis (average of $311). Flying from San Francisco to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
O'Fallon
Maryland Heights
Fairview Heights
Collinsville
Eureka
St. Peters
Glencoe
Alton
Festus
Chesterfield
Farmington

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for San Francisco to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.

Top 5 airlines flying from San Francisco to St. Louis

Discover the top 5 airlines that operate flights from San Francisco to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$108Average$225FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$202Average$352FlexibilityNo cancel feeOn-time71%
DeltaCheapest$246Average$362FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$296Average$440FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$304Average$445FlexibilityNo cancel feeOn-time63%

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