SFO - STL

$132 Find Cheap Flights from San Francisco to St. Louis

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from San Francisco to St. Louis departing on 4/19. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to St. Louis

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from San Francisco to St. Louis, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from San Francisco to St. Louis, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$368
Typical prices: $549-$385
Frontier
Sat 6/20Fri 6/26
SFO - STL • 2 stops
Cheapest non-stop
$372
Typical prices: $707-$413
United Airlines
Wed 5/6Tue 5/12
SFO - STL • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
Southwest's two free checked bags save costs on luggage.
Use MetroLink from STL for easy downtown access.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Cheapest • from $368 (round-trip)
Best reviews • 8.0 score
Airline reviews
Airline reviews
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Airline reviews
Airline reviews
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Nonstop flights
You can fly direct with Southwest and United Airlines. Average duration is 4h 15m
Direct flights
Direct flights
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Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $236 (round-trip)
Shortest trip • 5h 37m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 39% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 21% price drop
Most popular
Good to know
Good to know
+1
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Good to know
Good to know
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Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to St. Louis!
Flight Deals
Booking Insights
Expert advice
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from San Francisco to St. Louis that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from San Francisco to St. Louis

Sat, Jun 20 - Fri, Jun 26
Frontier Logo
10:50 pm - 7:23 pm
SFO
-
STL
42h 33m
2 stops
Frontier Logo
8:08 pm - 11:38 am
STL
-
SFO
17h 30m
1 stop
$368Frontier
Thu, Apr 23 - Mon, Apr 27
Frontier Logo
6:41 pm - 9:13 pm
SFO
-
STL
24h 32m
2 stops
Frontier Logo
3:21 pm - 10:31 pm
STL
-
SFO
9h 10m
1 stop
$372Frontier
Mon, May 11 - Sun, May 17
Frontier Logo
6:00 am - 7:23 pm
SFO
-
STL
11h 23m
1 stop
Frontier Logo
3:33 pm - 11:04 pm
STL
-
SFO
9h 31m
1 stop
$373Frontier
Mon, Apr 27 - Mon, May 4
Frontier Logo
11:16 pm - 11:19 pm
SFO
-
STL
22h 03m
2 stops
Frontier Logo
3:21 pm - 10:31 pm
STL
-
SFO
9h 10m
1 stop
$374Frontier
Wed, Jun 3 - Wed, Jun 10
Southwest Logo
11:25 am - 9:45 pm
SFO
-
STL
8h 20m
2 stops
Southwest Logo
3:10 pm - 10:15 pm
STL
-
SFO
9h 05m
2 stops
$377Southwest
Mon, May 11 - Thu, May 14
Frontier Logo
9:19 am - 8:23 pm
SFO
-
STL
9h 04m
2 stops
Frontier Logo
3:33 pm - 11:04 pm
STL
-
SFO
9h 31m
1 stop
$378Frontier
Fri, May 8 - Sun, May 17
Frontier Logo
9:56 pm - 6:04 pm
SFO
-
STL
18h 08m
2 stops
Frontier Logo
3:33 pm - 11:04 pm
STL
-
SFO
9h 31m
1 stop
$379Frontier
Tue, May 5 - Wed, May 6
Alaska Airlines Logo
2:00 pm - 11:59 pm
SFO
-
STL
7h 59m
1 stop
Alaska Airlines Logo
4:46 pm - 10:28 pm
STL
-
SFO
7h 42m
1 stop
$380Alaska Airlines
Wed, May 6 - Sun, May 17
Frontier Logo
11:59 pm - 4:54 pm
SFO
-
STL
14h 55m
2 stops
Frontier Logo
3:33 pm - 11:04 pm
STL
-
SFO
9h 31m
1 stop
$381Frontier
Sat, May 23 - Mon, May 25
Frontier Logo
8:56 am - 7:23 pm
SFO
-
STL
8h 27m
1 stop
Frontier Logo
9:06 pm - 10:38 am
STL
-
SFO
15h 32m
2 stops
$382Frontier
Booking Insights

KAYAK's insights & trends for San Francisco to St. Louis flights

Get data-powered insights and trends into flights from San Francisco to St. Louis to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from San Francisco to St. Louis?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from San Francisco to St. Louis departing in June.

What’s the cheapest day of the week to fly from San Francisco to St. Louis?

The average price of all round-trip flights from San Francisco to St. Louis clicked on KAYAK for each day over the last 12 months.

When flying from San Francisco to St. Louis, you should consider leaving on a Thursday and avoid Mondays if you are looking for the best rates. For your return to San Francisco, you’ll find the best rates on Fridays and the most expensive ones on Mondays.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from San Francisco to St. Louis, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from San Francisco to St. Louis is September, where tickets cost $390 (return) on average. On the other hand, the most expensive months are March and February, where the average cost of round-trip tickets is $635 and $605 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from San Francisco to St. Louis, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from San Francisco to St. Louis, you should book around 4 weeks before departure, which saves you about 39% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 14 weeks before departure.

Expert advice

Expert advice for your flight from San Francisco to St. Louis

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on United Airlines

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Blane Bachelor

Blane Bachelor

Expert on Southwest and SFO

Blane Bachelor is a journalist and editor specializing in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favorite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history. She will always choose the window seat.

Yulia Denisyuk

Yulia Denisyuk

Expert on STL

Yulia is a freelance journalist who’s dispatched from 90+ countries. Her work focuses on cultures, adventure trips and air travel, appearing in NatGeo, NYT, CNTraveler, and more. For past assignments, she’s stayed with nomads in Mongolia and learned the art of Imigongo in Rwanda. She’s based in Chicago; in winter she often questions that decision.

Good to know

Low seasonJanuary
Cheapest flight$132
Best time to beat the crowds but there is an average 1% increase in price.
Most popular time to fly and prices are also 4% lower on average.
Flight from San Francisco to St. Louis

When to book flights from San Francisco to St. Louis

Are your dates flexible? Find out the best times to travel from San Francisco to St. Louis based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from San Francisco to St. Louis

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

    In the last 3 days, the lowest price for a flight from San Francisco to St. Louis was $132 for a one-way ticket and $368 for a round-trip.

  • Do I need a passport to fly between San Francisco and St. Louis?

    No

  • Which airports will I be using when flying from San Francisco to St. Louis?

    San Francisco and St. Louis are both served by 1 main airport. You will leave San Francisco from San Francisco and will be arriving at Lambert-St Louis.

  • Which airlines offer Wi-Fi service onboard planes from San Francisco to St. Louis?

    Delta, Alaska Airlines, JetBlue, Hawaiian Airlines, and American Airlines offer inflight Wi-Fi service on the San Francisco to St. Louis flight route.

  • Which aircraft models fly most regularly from San Francisco to St. Louis?

    The Embraer 175 (Enhanced Winglets) is the aircraft model that flies most regularly on the San Francisco to St. Louis flight route.

  • Which airline alliances offer flights from San Francisco to St. Louis?

    oneworld, SkyTeam, and Star Alliance are the airline alliances operating flights between San Francisco and St. Louis, with oneworld being the most commonly used for this route.

  • On which days can I fly direct from San Francisco to St. Louis?

    There are nonstop flights from San Francisco to St. Louis on a daily basis.

  • Which is the best airline for flights from San Francisco to St. Louis, Southwest or Delta?

    The two airlines most popular with KAYAK users for flights from San Francisco to St. Louis are Southwest and Delta. With an average price for the route of $544 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $390 and an overall rating of 7.9.

  • How does KAYAK find such low prices on flights from San Francisco to St. Louis?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from San Francisco to St. Louis.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from San Francisco to St. Louis?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from San Francisco is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from San Francisco to St. Louis?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Louis with an airline and back to San Francisco with another airline. Booking your flights between San Francisco and STL can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from San Francisco to St. Louis?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from San Francisco up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from San Francisco to St. Louis

  • Looking for a cheap flight? 25% of our users found flights on this route for $251 or less one-way and $483 or less round-trip.

Prefer to fly direct from San Francisco to St. Louis?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from San Francisco to Lambert-St Louis.
Find which airlines fly direct from San Francisco Airport to Lambert-St Louis Airport, which days they fly and book direct flights.

Direct departures

San Francisco to Lambert-St Louis

Monday

Southwest,United Airlines

Southwest,United Airlines

Tuesday

Southwest,United Airlines

Southwest,United Airlines

Wednesday

Southwest,United Airlines

Southwest,United Airlines

Thursday

Southwest,United Airlines

Southwest,United Airlines

Friday

Southwest,United Airlines

Southwest,United Airlines

Saturday

United Airlines,Southwest

United Airlines,Southwest

Sunday

Southwest,United Airlines

Southwest,United Airlines

See more direct flights

Direct returns

Lambert-St Louis to San Francisco

Monday

Southwest,United Airlines

Southwest,United Airlines

Tuesday

Southwest,United Airlines

Southwest,United Airlines

Wednesday

Southwest,United Airlines

Southwest,United Airlines

Thursday

Southwest,United Airlines

Southwest,United Airlines

Friday

Southwest,United Airlines

Southwest,United Airlines

Saturday

United Airlines,Southwest

United Airlines,Southwest

Sunday

Southwest,United Airlines

Southwest,United Airlines

See more direct flights

Reviews of the top 5 airlines serving from San Francisco to St. Louis

 
See real verified KAYAK customer reviews for airlines flying from San Francisco to St. Louis. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from San Francisco to St. Louis? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4338 reviews
7.5Entertainment
7.0Food
8.6Crew
8.1Boarding
8.0Comfort
Airline reviews

Terrible. Even though there’s assigned seating now, they are still the slowest boarding airline of anyone.

2.0 MediocreJames, Apr 2026
LAX - MCO
Read more Southwest reviews

Terrible. Even though there’s assigned seating now, they are still the slowest boarding airline of anyone.

Communication about the delayed flight was poor. We were told to move gates three times but that was bad information. We went from gate 128 to gate 126 and then to gate 123 and back to gate 126. Communication about the delay was bad. Ended up being 1 1/2 hour late getting home.

It was good from LAX to Phoenix, But the connection in Phoenix to Tulsa was not that great. The staff on both flights were great. The choice of free entertainment was ok nothing to brag about. The 45 min delay because of some electrical issue wasn't great from Phoenix to Tulsa. We sat there with hardly any air, The seat I had was between windows so the side of the plane pushed in on you. My being a bigger man it then made the seating area uncomfortable. The seats on the plane had no power to connect to recharge your phone or anything. I would recommend that they should look into a slot or clamp to hold your phone to enjoy while watching the entertainment choices hands-free. Also make it possible to raise the inner seat by the window be able to raise the arm rest up to make more room for larger people to set more comfortably. I would also say other then that stop price gouging the airfare or nickel and diming everything. Not fair for people having to fly for emergencies and be paying for higher prices due to the season or holidays. Your making your money either way and the cost of flying is still going to be the same regardless if there's 100 people or 200 people.

I have roller bag with food and medication told me I couldn't bring on my 2nd flight today. 15 years flying with SW never an issue with that bag.

Southwest was greaat! The most expensive but the least upsetting for those we were flying to see.

Boarding was easy. The seats are small and fairly uncomfortable

The problem with the seat assignments is that there were a lot of rows in the front that were empty but my row at the back was full. Just not so pleasant.

Good but I prefer choose your own seat. With the new assigned seats they should board from the back I see no advantage to this new boarding. Just like every other airline

Flight boarded late after announcing on time boarding. Flight arrived only a little late despite late departure. Had trouble connecting to WiFi

I have not flown Southwest in awhile and had a very pleasant experience. From ticketing to boarding to the flight. The flight left on time and landed ahead of schedule. It won't be so long next time!!

Generally on time departures and arrivals, clean planes, sky miles membership provides great benefits (complimentary upgrades, etc).

N Everything was perfect from boarding to assistance to baggage in Tampa

Loved the crew! Sucks that we went from 1 hour and 8 minute layover to a 3 hour layover. But weather sucks like that.

Fast, lovely scenery, great info on the Delta flight screen about landmarks we were flying over. Great landing!

Long flight but comfortable and not freezing as I have experienced on Hawaiian flights to the islands. They gave us blankets just in case. Nice touch.

I took seat 15A in anticipation of window seat, there is no window.

Flight late, the waited for a long time for “personal” to arrive at gate to dock the plane in Rochester. So annoying. This flight was expected, why aren’t personel available for the jet bridge?

My recent experience was excellent on Delta! I flew with Delta Comfort and I was really comfortable in my seat. I enjoyed the in-flight service. The flight attendants were so friendly and hospitable. I love the snack on the flight as well. This was my first time flying on Delta and I will definitely consider flying with them again.

My flight was canceled on Sunday. Rebooking took three hours. Had to pay for accommodations another night. New flight was delayed for 5 hours, all that was sent was a 12 dollar food voucher, which doesn’t tell you how to use it. Then when we landed we had to sit on the plane for an hour before we could get off.

I was in first class and literally the men behind me were so aggressively loud I moved myself to economy. This has become so common on Delta - people using audio without headphones, and men on 12am / late night flights drinking and yelling to talk to each other which prevents anyone around them from resting. Pretty crazy to have to move from first to economy (poorer service, less comfort...). Wild wild. Looking into other airlines.

Boarding was again a "free for all". We were boarding group 4, and almost the entire plane was able to board before us. It's a shame that someone who follows the rules, gets the short end of the stick. Not fair.

It was perfect! I've never flown with United before, but I definitely will in the future

They delayed the flight from 9:00 to 11:55 At 11:45 they canceled the flight. I paid a premium price for the tickets with poor service

Seats are uncomfortable. This has been a trend in the industry for decades. Trying to fit more seats on each plane to increase profits at the expense of the passenger.

Staff were good. My seat was in need of repair, but for a short flight was not problematic. Usual basic snack and drink setup that you'll find on any US carrier. Over, a decent, basic flight.

Flight delayed for more than 16 hrs and no effort was spent to provide an alternate

Airport terminal was outdated, flight was on a small jet with no wifi

it was a very short flight so my expectations were low.

Very disappointing given gate agent behavior. Filed a formal complaint with United.

Terrible. No customer service, no food, no drinks on a 6 hour premier economy booking.

Good flight, seated and had a water within 5 minutes. Crew was hospitable.

We left at 1030 am pacific from LA and supposed to land at 7 pm Eastern in NY. They made a detour, stopped in Philadelphia and didn’t land till 1130 PM Eastern!!! Worst flight experience with no pilot communication with no explanation as to what was going on. Everyone was very frustrated to say the least.

Flight boarded from Gate 159B, the farthest gate in the LAX Bradley Terminal. While the flight operated on time, the first class cabin attendant made no recognition of my being an Advantage Executive Platinum member.

The flight itself was excellent but the gate attendant made me check my carryon since she said it was an inch too big. I’ve had no problems with this carryon on recent flights on Qantas, Delta, Austrian, Southwest Airlines even though the overhead bins are the same size. there were other carryons in the bins that also looked larger than mine and there was room left in the bins for more. When I picked up my carryon from baggage claim one of the wheels had broken off.

We called Kayak for a change due to the TSA situation in Atlanta. What we got was a canceled return flight (in error) and we had to find the mistake. Not happy with Kayak who blamed it on AA.

I was in last row so that is never great bc the person in front of me leaned his seat all the way back into me.

The experience at checkin for my American Airlines flight from Sacramento to LAX was very good including the assistance I received in getting my bags checked in and boarding passes printed. Was pleasantly surprised the my bags were checked through all the way to my destination at Clark International Airport in Angeles, Philippines.

Terrible planning. And even worse gate agents. Absolutely rude behavior.

Flight was scheduled at 11:26am but they keep Delaying until midnight. They waited at airport restless.

Rough flight No beverage service due to turbulence Bottom Seat cushion was non existent

They switched our terminal 3 times and we were delayed for four plus hours!!!

It was an early flight and most people napped/slept and the crew let us which was nice.

The crew acted like they had never done this and kept barking passive aggressive orders at people. + the security line + the delay + sitting on the tarmac for 2 hours + none of the apps or signage updating with correct times

More inflight connection. And leg space is horrible. And the paying for baggage I'd ridiculous!!!

Remind customers of the need to have passport or new ID for boarding.

The flight never took off and we spent 7 hours at the airport

It was ok. It was expensive to check 2 bags ($75.00 per bag), and then it took a long time to wait for shuttle to take us from one terminal to the terminal where the plane was taking off at LAX. And all of this for a flight where we had to pay for any food or drink that was not water.

When I wanted to check in 3 hours prior to boarding time, the employees mentioned “a little over an hour delay” so I waited for an hour then I went to go look for food in the terminal and most people from that flight were in the same area looking for food. Finally I decided after food to check to see if it’s anytime closer and now it’s 2 mins until boarding closes?! What are you kidding me? I didn’t receive anything via sms about boarding now nor via email or on the intercom. I luckily made it through, barely, and then there’s no room for my carry on mind you I’m in the very first row so I had to place my purse in one further row back and my carry on sections down. Not sure who pays for better seats to get your stuff placed all over the plane but that was the worst experience I’ve ever had flying with anyone.

This airline sucks. They offer low rates then charge you for everything, the app does not work well, the seats are the most uncomfortable. Maintenance issues on the flight, and you still have to sit through their credit card commercials. People are nice enough but does not make up for overall poor experience.

Cancelled flight after I arrived at airport after 75 min drive and parking. Next flight was 4 days in the future. Had to scramble and buy a much more expensive flight on another carrier.

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

Information on your arrival and departure airports