Cheap Flights from San Antonio (SAT) to St. Louis (CPS)

Popular airlines from San Antonio International Airport (SAT) to St. Louis, MO (CPS-St. Louis Downtown)

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 $509
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $509

Frequently asked questions

How much does a flight from San Antonio Intl. Airport (SAT) to St. Louis Downtown Airport (CPS) cost?
Grab a cheap one-way flight or cheap return flight from San Antonio Intl. Airport (SAT) to St. Louis Downtown Airport (CPS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from San Antonio Intl. Airport (SAT) to St. Louis Downtown Airport (CPS)?
Planning your trip for may help you find better deals, as it's the cheapest month for flights between SAT and CPS. You'll typically find the lowest prices during off-peak months.
What is the cheapest airline that flies from San Antonio Intl. Airport (SAT) to St. Louis Downtown Airport (CPS)?
To find the cheapest airline flying from SAT to CPS, use Expedia's filter tool. Tailor your search based on what matters most to you, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to see the most affordable options first.
How many flights per day from San Antonio Intl. Airport (SAT) to St. Louis Downtown Airport (CPS)?
There aren't any daily nonstop flights available from San Antonio Intl. Airport (SAT) to St. Louis Downtown Airport (CPS). But you can opt for flights with layovers. Filter your search results on Expedia to include one or two stops, and you'll be cruising above the clouds before you know it.
What day of the week has the most flights from SAT to CPS?
You'll typically find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from San Antonio Intl. Airport (SAT) to St. Louis Downtown Airport (CPS)?
To reach St. Louis Downtown Airport (CPS) on time, choose a flight that takes off from San Antonio Intl. Airport (SAT) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for East St. Louis from San Antonio Intl. Airport (SAT)?
Lambert-St. Louis Intl. Airport (STL) is the only airport in East St. Louis with direct flights from San Antonio Intl. Airport (SAT). Consider the options and find cheap fares on Expedia.
Is it cheaper to buy a plane ticket from San Antonio Intl. Airport (SAT) to St. Louis Downtown Airport (CPS) last-minute?
Holding off until just before your departure to book a flight from SAT to CPS generally means paying more. Although you may find some last-minute deals, they aren't always guaranteed. Keep your travel plans flexible to boost your chances of snagging a bargain.
Is it cheaper to book a SAT to CPS flight and hotel package?
Booking a SAT to CPS flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip all in one place. Choose from our impressive range of hotels and then add car rentals, flights and activities 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 Antonio Intl. Airport (SAT) to St. Louis Downtown Airport (CPS)?
Typically, it's possible to cancel or reschedule your SAT to CPS flight. However, if it's been more than 24 hours since booking, additional fees may apply. Check your airline's policies in your itinerary to see what changes are possible and whether any costs are involved. You'll also find more information on our Customer Service portal.

Travel information

Travel information

Origin airport
San Antonio Intl.
Destination airport
St. Louis Downtown
Distance
784 mi

Book with confidence

Book with confidence

San Antonio to St. Louis Flights

The cheapest times to fly from San Antonio 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 Antonio to St. Louis are during the month of . You can find some of the cheapest flights from San Antonio to St. Louis with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from San Antonio 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 Antonio 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 Antonio to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from 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 Antonio 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 Antonio 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 Antonio to St. Louis Flights

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*Available to One Key members.