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$82+ Cheap flights from St. Louis to San Francisco (STL - SFO)

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 12/9. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SFO
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to San Francisco are usually found in February or January, booked 42 days in advance, depart on a Thursday or Saturday and return on a Tuesday

Cheap flight deals from St. Louis to San Francisco

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to San Francisco (SFO). 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 September 11, 2025.

Round-trip from

$170
(Flightnetwork)

One-way from

$82
(Southwest)

Popular in

July

Cheapest in

February

Average price

$392

Good round-trip deal

$601 or less

Good one-way deal

$203 or less
From Lambert-St Louis to San Francisco
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One-way flight from Lambert-St Louis to San Francisco
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Highest demand for flights based on searches. 7% potential increase in price ($33 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Lambert-St Louis to San Francisco.
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Price to beat on a one-way flight from Lambert-St Louis to San Francisco.
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Find flight deals from St. Louis to San Francisco

Cheapest flights from St. Louis to San Francisco
Explore the most affordable flight options available from St. Louis to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Flightnetwork deal was found by Cheapflights users on 9/10. 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.
Thu 10/1610:17 amSTL - SFO
1 stop7h 43mFrontier
Sun 10/198:27 pmSFO - STL
1 stop13h 16mFrontier
Deal found 9/10$170
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/2710:18 amSTL - SFO
1 stop7h 42mFrontier
Wed 10/298:00 amSFO - STL
2 stops23h 07mFrontier
Deal found 9/10$174
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/262:38 pmSTL - SFO
1 stop8h 43mFrontier
Wed 10/18:00 amSFO - STL
2 stops23h 06mFrontier
Deal found 9/10$175
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/136:22 pmSTL - SFO
1 stop19h 53mFrontier
Mon 11/173:35 pmSFO - STL
1 stop15h 32mFrontier
Deal found 9/10$178
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Mon 10/275:29 pmSTL - SFO
Nonstop4h 38mUnited Airlines
Wed 10/2910:35 amSFO - STL
Nonstop3h 52mUnited Airlines
Deal found 9/10$179
This Frontier deal was found by Cheapflights users on 9/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/67:45 pmSTL - SFO
1 stop6h 29mFrontier
Sun 11/98:55 pmSFO - STL
1 stop12h 29mFrontier
Deal found 9/10$180
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/262:38 pmSTL - SFO
1 stop8h 43mFrontier
Tue 9/308:00 amSFO - STL
2 stops23h 06mFrontier
Deal found 9/10$188
This Frontier deal was found by Cheapflights users on 9/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/77:45 pmSTL - SFO
1 stop6h 29mFrontier
Sun 11/96:33 pmSFO - STL
2 stops12h 34mFrontier
Deal found 9/10$189
This Frontier deal was found by Cheapflights users on 9/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/257:55 pmSTL - SFO
1 stop6h 21mFrontier
Mon 9/297:07 pmSFO - STL
1 stop11h 59mFrontier
Deal found 9/10$192
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/77:52 pmSTL - SFO
2 stops27h 30mFrontier
Thu 10/165:45 amSFO - STL
1 stop27h 58mFrontier
Deal found 9/9$194
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Fri 10/245:35 pmSTL - SFO
Nonstop4h 35mUnited Airlines
Sun 10/2610:35 amSFO - STL
Nonstop3h 52mUnited Airlines
Deal found 9/10$195
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/109:59 pmSTL - SFO
1 stop13h 30mFrontier
Tue 10/148:00 amSFO - STL
2 stops23h 07mFrontier
Deal found 9/10$196

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to San Francisco 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 September 11, 2025.
Use the filters below to find and compare flights from St. Louis to San Francisco that are best for you.

Fly from

St. Louis

Fly to

San Francisco

Route

Depart

Return

Price

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

Sat 10/25

2:55 pm-8:45 pm

1 stop7h 50m

San Francisco

Wed 11/5

10:50 am-4:35 pm

Nonstop3h 45m

$199

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

Wed 10/8

7:35 am-2:10 pm

1 stop8h 35m

San Francisco

Wed 10/15

3:00 pm-12:10 am

1 stop7h 10m

$204

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

Fri 9/26

2:38 pm-9:21 pm

1 stop8h 43m

San Francisco

Mon 9/29

11:57 pm-9:06 am

2 stops31h 09m

$208

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

Thu 10/2

1:40 pm-5:36 pm

1 stop5h 56m

San Francisco

Sat 10/4

12:43 am-9:52 am

1 stop7h 09m

$215

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

Sat 11/1

4:40 pm-6:55 pm

Nonstop4h 15m

San Francisco

Sat 11/8

6:25 am-5:00 pm

1 stop8h 35m

$225

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

Tue 9/16

7:55 pm-10:30 pm

1 stop28h 35m

San Francisco

Fri 9/19

7:07 pm-9:06 am

1 stop11h 59m

$248

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

Thu 11/13

5:29 pm-8:07 pm

Nonstop4h 38m

San Francisco

Mon 11/17

10:35 am-4:27 pm

Nonstop3h 52m

$254

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

Wed 10/8

3:30 pm-8:40 pm

1 stop7h 10m

San Francisco

Mon 10/13

12:35 am-11:34 am

1 stop8h 59m

$275

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

Tue 10/7

11:21 am-5:52 pm

1 stop8h 31m

San Francisco

Mon 10/13

12:35 am-11:34 am

1 stop8h 59m

$275

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

Fri 10/31

5:29 pm-8:07 pm

Nonstop4h 38m

San Francisco

Sat 11/1

12:43 am-10:39 am

1 stop8h 56m

$278

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

Showing 1-10 of 20 results
1
2

The best insider tips for St. Louis to San Francisco 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 St. Louis to San Francisco trip
Airports
STL

Security lines at STL are generally quick, averaging 5-10 minutes off-peak. Check real-time wait times online before heading to the airport.

Read more about STLby Taryn White
SFO

For a budget-friendly trip from SFO to downtown, take BART. It's a 40-minute ride from the airport.

Read more about SFOby Harriet Baskas
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 St. Louis to San Francisco

Have a flexible travel schedule? Discover the best time to fly to San Francisco from St. Louis 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 St. Louis to San Francisco

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

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to San Francisco. Price data was last updated on August 29, 2025.

The best time to book flights from St. Louis to San Francisco is 42 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, January is the cheapest month in which you can book a flight from St. Louis to San Francisco (average of $276). Flying from St. Louis to San Francisco in June is currently the most expensive (average of $357). 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 STL to SFO?

Find hourly flight availability from St. Louis to San Francisco. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

It’s typically best to fly out from St. Louis to San Francisco at noon. Doing so could potentially save you 62% on the flight price compared to flying in the evening, which is usually more expensive.

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

Use this chart to determine the cheapest time to fly round-trip from St. Louis to San Francisco. Price data was last updated on September 7, 2025.

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

Reviews of airlines servicing San Francisco

Get insights into the airlines that provide service to San Francisco. 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 San Francisco. Reviews last updated September 11, 2025.
Read through reviews of airlines operating flights from St. Louis to San Francisco, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Overall

8.0

Comfort

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Overall

8.0

Comfort

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
8.0
Very good
7,960 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Overall

8.0

Comfort

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,937 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Overall

8.0

Comfort

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Overall

8.0

Comfort

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,177 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Overall

8.0

Comfort

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to San Francisco. 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 St. Louis to San Francisco?

    If you wish to fly to San Francisco from St. Louis, then you need to book flights from Lambert-St Louis to San Francisco. There are 3 flights from Lambert-St Louis (STL) to San Francisco (SFO) per day to choose from. Flights to San Francisco from Lambert-St Louis are available from 5 different airlines, which means you should have some options if you want to compare airfare deals. 4h 10m is how long a nonstop flight from St. Louis to San Francisco typically takes.

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

    This flight path from Lambert-St Louis to San Francisco was viewed by 15 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from St. Louis to San Francisco?

    Southwest, Frontier, and United Airlines can get you from St. Louis to San Francisco in just under 5h 56m. Your travel time can differ by up to 2h 47m. The distance from St. Louis to San Francisco is about 1730 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    According to our current data, Frontier ($117), American Airlines ($202), and United Airlines ($236) offers the cheapest pricing from St. Louis to San Francisco. Frontier is currently priced 69% below the average price you’ll pay for this route.

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

    The top 3 most reliable airlines when flying from St. Louis to San Francisco are Southwest (69%), Asiana Airlines (68%) and Air New Zealand (62%).

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

    Looking for the cheapest flight from St. Louis to San Francisco? While on average our users pay $621, our data indicates the cheapest price to be $149. The most popular route (Lambert-St Louis - San Francisco), is priced around $179.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from St. Louis to San Francisco 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 St. Louis to San Francisco?

    Currently, January is the cheapest month in which you can book a flight from St. Louis to San Francisco (average of $276). Flying from St. Louis to San Francisco in June is currently the most expensive (average of $357). 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 San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Roseville
Santa Cruz
Livermore
South San Francisco
Turlock
Antioch
Watsonville
Manteca
Santa Clara
Sunnyvale
Hollister
Vacaville
Foster City
Vallejo
Burlingame
Redwood City
Union City
San Leandro
San Mateo
Lathrop

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Top 5 airlines flying from St. Louis to San Francisco

Discover the top 5 airlines that operate flights from St. Louis to San Francisco. 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$117Average$234FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$202Average$339FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$236Average$409FlexibilityNo cancel feeOn-time69%
DeltaCheapest$256Average$358FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$305Average$438FlexibilityNo cancel feeOn-time63%

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