Cheap flights from San Antonio International to St Louis

Compare San Antonio International to St Louis flight deals

Find the cheapest month or even day of the year to fly to St Louis

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Flight deals from San Antonio International to St Louis

Looking for a cheap last-minute deal or the best round-trip flight from San Antonio International Airport to St Louis Airport? If you want to travel next month, round-trip fares start from $179. Find the lowest prices on one-way and round-trip tickets right here.

Find the cheapest month to fly from San Antonio International to St Louis

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like San Antonio International to St Louis flights are currently cheapest in June.

Direct flights from San Antonio International to St Louis

San Antonio International to St Louis: Alternative routes

Compare routes from San Antonio International to St Louis below. You may find an airport to fly into that's cheaper, faster, or easier than St Louis.

San Antonio to St Louis: Flight information

The things to know before you go.
Cheapest flight found$179
Cheapest month to flyJune
Average flight time2 hrs, 8 mins
Most popular airlineSouthwest Airlines
Average flights per week15

Finding cheap flights from San Antonio International to St Louis: Frequently asked questions

The best price we found for a round-trip flight from San Antonio International to St Louis is $179. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
2 hours and 8 minutes is the average flight time from San Antonio International to St Louis.
Southwest Airlines flies direct from San Antonio International to St Louis.
There are 15 flights per week flying from San Antonio International to St Louis, as of May 2026.
The cheapest month to fly from San Antonio International to St Louis is usually June.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from San Antonio International Airport to St Louis Airport on Tuesday, June 2, 2026.
Yes – the average flight time is 2 hours and 8 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to St Louis but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar, and it looks like the cheapest time to book a flight to St Louis is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Frontier Airlines and Southwest Airlines offer the cheapest flight tickets to St Louis.

Traveling from San Antonio International Airport (SAT) to Lambert-St. Louis International Airport (STL): what you need to know

  • San Antonio and St Louis are both in the UTC-5 timezone. That means there's no time difference to adjust for.

  • Leave plenty of time to make your SAT to STL flight. A good rule of thumb is to arrive two hours before international departures and an hour ahead for domestic flights.

  • Traveling during a peak month like July? Public holidays and other popular seasons can lead to longer queues at check-in and security. Play it safe and get there up to four hours before international flights and two hours before domestic departures.

  • Southwest Airlines has direct flights from San Antonio International Airport to Lambert-St. Louis International Airport. Book with this popular carrier, then get ready to see the sights in St Louis — and maybe even more of United States if time allows.

  • The airline that serves the most passengers on this route is Southwest Airlines.

  • Southwest Airlines leads the way as the most punctual carrier for SAT to STL flights, with 81.08% of its services arriving as scheduled.

  • Consider adding a stopover when booking your ticket from San Antonio International Airport to Lambert-St. Louis International Airport. Just deselect 'Direct flights only' to break up your journey, or visit a new city along the way. Here's where you can stop between SAT and STL:

    • Dallas Love Field Airport

    • Dallas/Fort Worth International Airport

    • George Bush Intercontinental Airport

How to find the cheapest flights from San Antonio International Airport (SAT) to Lambert-St. Louis International Airport (STL)

  • The lowest price we've seen for a one-way San Antonio International Airport to Lambert-St. Louis International Airport flight is $95. A return fare right now is $179. Depending on the availability when you book, these fares may change.

  • It's usually smart to book ahead of time if you want to get cheap tickets from SAT to STL. That's because airlines change prices based on demand, which tends to rise closer to departure.

  • If you're flexible with your travel plans, use the 'Whole month' tool. It'll give you the cheapest price in every month when looking for your flight from San Antonio International Airport to Lambert-St. Louis International Airport.

  • Stay on top of deals for cheap flights from SAT to STL by setting up a Price Alert. You'll get an email or push notification on the app when a new low fare is offered.

  • Lock in the right flight for you with the help of the filters. To see the 'Cheapest,' 'Fastest' or 'Best' flights from San Antonio International Airport to Lambert-St. Louis International Airport, use the 'Sort by' function. You can also filter results by airline, departure and arrival times, and number of stops.

Handy information about San Antonio International Airport (SAT)

  • You'll find SAT at 9800 Airport Boulevard.

  • 83.17% of flights departing from San Antonio International Airport touch down at their destination as planned. Given its dependable on-time performance, delays are unlikely when flying out of SAT.

  • To reach San Antonio International Airport from central San Antonio, it'll take about 20 minutes by car. Of course, this depends on traffic. It's approximately 19 kilometers from the airport to the city center.

  • Planning to catch public transport? Expect a trip time of around 1 hour 30 minutes.

  • Looking for a convenient hotel near SAT? If you're boarding an early flight from San Antonio International Airport to Lambert-St. Louis International Airport, these accommodation options will have you moments from your departure lounge:

Arriving at Lambert-St. Louis International Airport (STL)

Getting from Lambert-St. Louis International Airport (STL) to central St Louis

  • STL is located at 10701 Lambert International Blvd..

  • Lambert-St. Louis International Airport is roughly 26 kilometers from the center of St Louis. The drive time takes about 20 minutes.

  • If you're taking public transport, expect a journey time of roughly 35 minutes.

When to fly to Lambert-St. Louis International Airport (STL)

  • The quietest month for a flight from San Antonio International Airport to Lambert-St. Louis International Airport is April, while July is the busiest. Pick the best time to go to St Louis based on whether you prefer a more fast-paced or easygoing experience.

  • When booking your flight from San Antonio International Airport to Lambert-St. Louis International Airport, consider the type of weather you like. July is the warmest month in St Louis, with temperatures ranging from 17ºC (63ºF) to 33ºC (91ºF).

  • If you like cooler conditions, search for a cheap ticket from SAT to STL in January. Average temperatures are between -8ºC (18ºF) and 7ºC (45ºF) then.

Explore more of United States

  • St Louis has plenty to offer, but there are so many other parts of United States just waiting to be explored. Around 418 kilometers north-east of St Louis, a trip to Chicago will fill your itinerary to the brim. Start with popular sights like Millennium Park, Art Institute of Chicago and LandShark Beer Garden at Navy Pier.

  • If you're interested in discovering another well-known destination in United States, consider Indianapolis, about 370 kilometers east of St Louis. The Children's Museum of Indianapolis, Indianapolis Museum of Art and Indianapolis Zoo are among its highlights.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.