A city skyline with a prominent arch bridge at sunset.

$138 Cheap Flights from San Francisco (SFO) to St. Louis (STL)

View $138 flight on Wed, Sep 9, 2026Opens in a new window

Popular airlines from San Francisco Intl. Airport (SFO) to St. Louis Lambert Intl. Airport (STL)

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

Prices were available within the past 7 days and start at $138 for one-way flights and $276 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Fri, Sep 11 - Sat, Sep 12
SFO
San Francisco
STL
St. Louis
$276 Roundtrip, just found
$276
Roundtrip
just found
Select Frontier Airlines flight, departing Fri, Sep 11 from San Francisco to St. Louis, returning Sat, Sep 12, priced at $276 just found
Frontier Airlines
Sat, Sep 12 - Sat, Sep 19
SFO
San Francisco
STL
St. Louis
$286 Roundtrip, found 1 hour ago
$286
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Sat, Sep 12 from San Francisco to St. Louis, returning Sat, Sep 19, priced at $286 found 1 hour ago
Southwest Airlines
Mon, Sep 28 - Sat, Oct 3
SFO
San Francisco
STL
St. Louis
$289 Roundtrip, found 4 days ago
$289
Roundtrip
found 4 days ago
Select Southwest Airlines flight, departing Mon, Sep 28 from San Francisco to St. Louis, returning Sat, Oct 3, priced at $289 found 4 days ago
Frontier Airlines
Fri, Sep 11 - Sat, Sep 12
SFO
San Francisco
STL
St. Louis
$307 Roundtrip, just found
$307
Roundtrip
just found
Select Frontier Airlines flight, departing Fri, Sep 11 from San Francisco to St. Louis, returning Sat, Sep 12, priced at $307 just found
Delta
Tue, Sep 29 - Sat, Oct 3
SFO
San Francisco
STL
St. Louis
$315 Roundtrip, found 2 hours ago
$315
Roundtrip
found 2 hours ago
Select Delta flight, departing Tue, Sep 29 from San Francisco to St. Louis, returning Sat, Oct 3, priced at $315 found 2 hours ago
Frontier Airlines
Mon, Nov 16 - Wed, Nov 18
SFO
San Francisco
STL
St. Louis
$315 Roundtrip, just found
$315
Roundtrip
just found
Select Frontier Airlines flight, departing Mon, Nov 16 from San Francisco to St. Louis, returning Wed, Nov 18, priced at $315 just found
Frontier Airlines
Mon, Nov 16 - Wed, Nov 18
SFO
San Francisco
STL
St. Louis
$317 Roundtrip, just found
$317
Roundtrip
just found
Select Frontier Airlines flight, departing Mon, Nov 16 from San Francisco to St. Louis, returning Wed, Nov 18, priced at $317 just found
Frontier Airlines
Sun, Oct 18 - Sat, Oct 24
SFO
San Francisco
STL
St. Louis
$318 Roundtrip, found 1 hour ago
$318
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Sun, Oct 18 from San Francisco to St. Louis, returning Sat, Oct 24, priced at $318 found 1 hour ago
American Airlines
Fri, Oct 2 - Mon, Oct 5
SFO
San Francisco
STL
St. Louis
$325 Roundtrip, found 5 hours ago
$325
Roundtrip
found 5 hours ago
Select American Airlines flight, departing Fri, Oct 2 from San Francisco to St. Louis, returning Mon, Oct 5, priced at $325 found 5 hours ago
Alaska Airlines
Sat, Sep 12 - Sat, Sep 19
SFO
San Francisco
STL
St. Louis
$332 Roundtrip, found 1 hour ago
$332
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Sat, Sep 12 from San Francisco to St. Louis, returning Sat, Sep 19, priced at $332 found 1 hour ago

Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $468
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $468

Find the cheapest month to fly from San Francisco (SFO) to St. Louis (STL)

October is typically the cheapest month to fly

From $248 - $350 per traveler.

What you need to know for your flight from San Francisco Intl. to Lambert-St. Louis Intl.

San Francisco (SFO) to St. Louis (STL) at a glance

Travelers can choose from a range of airlines offering flights from San Francisco (SFO) to St. Louis (STL) on this domestic short-haul route. You can compare options from both full-service and low-cost carriers to find the best itinerary that aligns with your budget and schedule as you prepare to explore the iconic sights and vibrant neighborhoods of St. Louis. Here you'll find essential information about SFO to STL flights, including flight times and details for your journey from San Francisco International Airport (SFO) to Lambert-St. Louis International Airport (STL).

  • Fastest flight duration: around 4 hours non-stop
  • Route distance: roughly 1,700 miles (2,740 km)
  • Flights per week: around 20+ flights with multiple daily departures on average
  • Typical fares (one-way): economy tickets often range from $110–$570, depending on seasonality and how far ahead you book

Flights from San Francisco International Airport (SFO) to Lambert-St. Louis International Airport (STL)

Based on the latest traveler bookings, here are the top airlines commonly selected for flights from San Francisco to St. Louis, featuring both non-stop and one-stop options. Notable layover locations include Denver International Airport (DEN) with a layover of about 1 hour and 45 minutes, Harry Reid International Airport (LAS) with approximately a 1-hour layover, and Sky Harbor International Airport (PHX) with around a 55-minute layover. This variety allows you to balance price, total travel time, and cabin class to create the ideal itinerary.

  • United: As a comprehensive airline, United provides both non-stop and one-stop options, with one-way ticket prices generally falling between $130 and $590. This carrier represents around 33% of the departures on this route, with direct flights taking approximately 4 hours.
  • Southwest Airlines: Known for its budget-friendly fares, Southwest Airlines offers non-stop and one-stop services, typically charging between $145 and $600 for one-way tickets. It accounts for about 26% of the departures on this route, with non-stop flights lasting around 4 hours.
  • American Airlines: This full-service airline features one-stop flights, with one-way prices generally ranging from $110 to $500. American Airlines covers roughly 16% of departures on this route, with a flight duration of 5 hours and a total travel time of around 6 hours and 30 minutes, including layovers.
  • Delta: Delta is another full-service airline providing one-stop services, with one-way fares that typically range from $130 to $600. It represents about 12% of the route's departures, with a flight time of 5 hours and a total journey time of approximately 6 hours and 30 minutes, including layovers.
  • Frontier Airlines: As a low-cost option, Frontier Airlines offers one-stop services, with one-way fares usually between $110 and $260. This carrier makes up around 11% of the departures on this route, featuring a flight time of 5 hours and a total travel duration of about 6 hours and 30 minutes, including layovers.

Travelers have the option to upgrade their flight from San Francisco to St. Louis. Leading airlines for first-class service include United, Delta, and American Airlines, ensuring a comfortable journey.

Best time to fly from San Francisco (SFO) to St. Louis (STL)

The most popular months for travelers flying from San Francisco to St. Louis are January, March, and April, when peak temperatures in St. Louis reach up to 56.1°F in April. If you prefer quieter travel, consider September, the least busy and relatively cheaper time to visit with fewer crowds and temperatures around 70.9°F. For better deals, May usually offers the lowest average one-way fare around $241. Flight availability peaks in October, with approximately 27 flights per week, making it easier to find convenient departure times. February has the fewest flights, with approximately 17 flights per week.

  • Cheapest time to fly: May usually offers good deals with average one-way fare around $241, roughly 13% cheaper than the yearly average.
  • More budget-friendly months to fly: January, September, and August typically offer average one-way fares of around $255.
  • Most flight options: October has the highest number of flights from San Francisco to St. Louis, with approximately 27 flights per week, giving you more flexibility in scheduling your trip.
calendar iconMonthtemperature iconTemperaturecrowd level iconDemandflights iconWeekly Flightsprice iconAverage one-way Fare
January31.6°F (-0.2°C)Slightly High18$253
February34.9°F (1.6°C)Slightly Low17$277
March46.4°F (8.0°C)Slightly High18$341
April56.1°F (13.4°C)Slightly High18$280
May66.6°F (19.2°C)Average22$241
June76.1°F (24.5°C)Average23$274
July78.6°F (25.9°C)Average23$282
August77.0°F (25.0°C)Average26$257
September70.9°F (21.6°C)Slightly Low21$255
October58.6°F (14.8°C)Average27$259
November46.2°F (7.9°C)Average24$308
December37.8°F (3.2°C)Slightly Low19$324

*Average one-way fare is based on Expedia flight booking data from January 2025 to April 2026 for the specified route and travel class and may change depending on availability, dates, and demand.

Alternative route from San Francisco (SFO) to St. Louis (STL)

  • Oakland to St. Louis (OAK-STL): Oakland International Airport (OAK) is located approximately 12 miles from San Francisco International Airport (SFO). One-way economy tickets for this journey generally range from $135 to $500, influenced by the time of year and how far in advance you book. Travelers can choose between non-stop and one-stop flights, with common layover points being Denver International Airport (DEN) and Salt Lake City International Airport (SLC). The main airlines operating on this route are Southwest Airlines, a budget-friendly choice, and Delta. Additionally, this route offers first-class service as well.

How to find the best prices for flights from San Francisco (SFO) to St. Louis (STL)

Getting some of the best deals on flights from San Francisco to St. Louis is all about timing and flexibility. Here are some key tips to help you save:

  1. Best times to book and fly: cheaper fares are usually available when booking at least two months in advance, although most travelers tend to book between two to eight weeks ahead. Evening departures from 6 PM to midnight often offer lower prices, while morning flights from 5 AM to noon are more popular. Additionally, flying on Tuesday generally yields cheaper rates, but Thursday remains the most favored travel day.
  2. Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
  3. Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.*
  4. Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
  5. Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
  6. Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.

*Members only. Savings vary and are not available on all bundles. Select hotels.

Arriving at Lambert-St. Louis International Airport from San Francisco International Airport

St. Louis welcomes travelers from San Francisco with a range of transport options based on price, convenience, and proximity. Here's how to reach St. Louis efficiently:

  • Hotel transfer: Transfers offer a convenient way to reach your hotel in St. Louis, with private rides that can be arranged in advance.
  • Car rental: Renting a car from Lambert-St. Louis International Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Lambert-St. Louis International Airport on Expedia.
  • Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
  • Public transportation: From Lambert-St. Louis International Airport, Lambert Main Terminal Station, a metro station, is located about 0.1 miles away on foot, providing easy access for travelers looking to use public transport.

Frequently asked questions

How much does a flight from San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) cost?
You can find cheap one-way flights from $138 and cheap return flights from $276 San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) with Expedia. One-way flights generally range between $204 and $1302, and roundtrip flights usually range from $324 to $1374. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
September is the cheapest month to fly from San Francisco, CA (SFO) to St. Louis, MO (STL), with average return fares around $365. This is about 18% lower than the average price throughout the year, as September typically has less travel activity. Other affordable months to consider for this route are April and October.*Averages based on flights available on Expedia in the last year.
Which airlines fly direct from San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
You can fly direct from SFO to STL on United, with around 13 flights per week.
What is the cheapest airline that flies from San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
United is one of the cheapest airlines offering nonstop flights from San Francisco Intl. (SFO) to Lambert-St. Louis Intl. (STL), with round-trip tickets starting from around $382. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
To find a cheap flight from San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The best airline to fly with from San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) will differ from traveler to traveler. If you like to fly early, WN offers early morning flights. If price is the most important factor, WN typically offers the lowest fares. United offers the most daily flights from San Francisco (SFO) to St. Louis (STL), which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
For flights from San Francisco (SFO) to St. Louis (STL), the best times to travel are September and October. You can expect return flights to be around $365 during these months. September and October are great choices as they offer pleasant weather and fewer crowds, enhancing your travel experience.*Prices based on flights available on Expedia in the last year.
How many flights per day from San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
You can find approximately 3 nonstop flights per day from San Francisco Intl. (SFO) to Lambert-St. Louis Intl. (STL). For more options, look at flights that include layovers.
What is the earliest flight from San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Sort flights by "Departure (earliest)" on Expedia to find the earliest flight from SFO to STL. To compare more early flights, use the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The most popular departure times for flights from San Francisco Intl. (SFO) to St. Louis, MO (STL) are in the early morning, from 6am to 9am. About 23% of passengers prefer this time window. Many major carriers, including American Airlines, United and Delta offer flights during this window. This timing works well because it allows you to arrive in St. Louis with a full day ahead of you.
How long does it take to fly from San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Flying nonstop from SFO to STL takes around 4 hours, with the route covering approximately 1,732 miles. Flights with a layover typically take 3 hours 30 minutes longer than direct options. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Business class seats are offered on the SFO to STL route with American Airlines.First class cabins are available on:

  • United Airlines
  • Delta Air Lines
  • American Airlines

How much is a business class flight from San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
A direct, return business class ticket from San Francisco (SFO) to St. Louis (STL) typically costs between $1,747 - $2,447. A non-stop, one-way business class flight is usually around $579 - $799. Prices often fluctuate based on seasonality and how early you book. You may also be able to find a cheaper business class journey between San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) if you opt for a connecting flight.*Prices based on flights available on Expedia in the last year.
How do I earn miles on a San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight with Expedia?
It's easy to earn miles on a San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for St. Louis from San Francisco Intl. (SFO)?
From San Francisco Intl. (SFO), you can fly into Lambert-St. Louis Intl. (STL) to reach St. Louis. Some flights may connect through major hubs like Harry Reid Intl. (LAS), San Diego Intl. (SAN), Los Angeles Intl. (LAX) before reaching St. Louis. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) at the last minute?
Typically, booking a last minute flight from San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight and hotel package?
Securing a San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) St Louis Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
If you booked your San Francisco, CA (SFO-San Francisco Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
San Francisco Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$276
Distance
1731 mi
Average flight time
8 hours 49 mins

Book with confidence

San Francisco to St. Louis Flights

The cheapest times to fly from San Francisco to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from San Francisco to St. Louis are during the month of September. You can find some of the cheapest flights from San Francisco to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from San Francisco to St. Louis

Sunday is one of the best days to book for cheap flights from San Francisco to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from San Francisco to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from San Francisco to St. Louis in 2026. You can also book with separate airlines for your outbound and return journeys, from $138 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap San Francisco to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your San Francisco to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

San Francisco to St. Louis Flights

*Flight schedules are subject to change.

*Available to One Key members.

 

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