Cheap Flights from St Louis to San Antonio International

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Flight deals from St Louis to San Antonio International

Looking for a cheap last-minute deal or the best return flight from St Louis to San Antonio International? Find the lowest prices on one-way and return tickets right here.

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

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

Direct flights from St Louis to San Antonio International

St Louis to San Antonio International: Alternative routes

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

St Louis to San Antonio: Flight information

The things to know before you go.
Cheapest flight foundR 1,991
Cheapest month to flyApril
Average flight time2 hrs, 15 mins
Most popular airlineSouthwest Airlines
Average flights per week15

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

The best price we found for a return flight from St Louis to San Antonio International is R 3,881. 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 15 minutes is the average flight time from St Louis to San Antonio International.
Southwest Airlines flies direct from St Louis to San Antonio International.
As of April 2025, there are 15 flights per week flying from St Louis to San Antonio International.
The cheapest month to fly from St Louis to San Antonio International is usually April 2025.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to San Antonio International Airport on Thursday, 24 April 2025.
Yes – the average flight time is 2 hours and 15 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 San Antonio International 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 San Antonio 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 San Antonio International.

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

  • On average, direct flights from Lambert-St. Louis International Airport to San Antonio International Airport take 2 hours 14 minutes. San Antonio and St Louis are in the same timezone (UTC-5), meaning you won't need to adjust your watch when you arrive.

  • For the earliest departure, jump on the 05:00 flight from Lambert-St. Louis International Airport to San Antonio International Airport. If you'd like to set off later, the last flight departs at 22:50. With 8 weekly flights from STL to SAT, you can select the timing that's best for you.

  • Delays at security and check-in are more likely if you're travelling during high season, so allow some extra breathing space. A good rule of thumb for peak times? Arrive up to four hours ahead for international flights and at least two hours for domestic departures.

  • We make it a piece of cake to get a flight with a stopover. To see all your options for flights from Lambert-St. Louis International Airport to San Antonio International Airport, deselect 'Direct flights only.' Then, choose a flight offering a stop long enough to tour your chosen city. Popular stopovers between STL and SAT include:

    • George Bush Intercontinental Airport

    • Dallas/Fort Worth International Airport

    • Dallas Love Field

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

  • R 1,991 is the best price for a one-way ticket from Lambert-St. Louis International Airport to San Antonio International Airport. A return flight starts at R 3,881. These prices can change depending on availability.

  • To get cheap tickets from STL to SAT, book your journey 9 months ahead of your departure date.

  • Schedule your trip for May. That's the cheapest month for tickets from Lambert-St. Louis International Airport to San Antonio International Airport. If you have flexibility with your dates, try out the 'Whole month' tool to see the lowest airfare across each month.

  • Snapping up a cheap ticket from STL to SAT is straightforward with Price Alerts. Simply create one of these automatic alerts and we'll get in touch as soon as the price has dropped.

  • Play around with filters to find the ideal journey for you. To see the 'Cheapest,' 'Fastest' or 'Best' flights from Lambert-St. Louis International Airport to San Antonio International Airport, use the 'Sort by' function. You can also filter results by airline, arrival and departure times, and journey duration.

Handy information about Lambert-St. Louis International Airport (STL)

  • Lambert-St. Louis International Airport is around 26 kilometres from central St Louis. If you're ride-sharing, catching a cab or driving from the centre, it'll take 21 minutes or so to get there, depending on traffic conditions. If you're planning to take public transport, expect the trip time to be approximately 36 minutes.

  • Searching for a convenient hotel near STL? If you're boarding an early flight from Lambert-St. Louis International Airport to San Antonio International Airport, these stays will have you moments from check-in:

Arriving at San Antonio International Airport (SAT)

Getting from San Antonio International Airport (SAT) to central San Antonio

  • San Antonio International Airport is approximately 19 kilometres from central San Antonio. With your own car rental or if you take a cab, the drive is around 21 minutes.

  • Travelling by public transport takes roughly 1 hour and 32 minutes.

When to fly to San Antonio International Airport (SAT)

  • The quietest month for a flight from Lambert-St. Louis International Airport to San Antonio International Airport is April, while July is the busiest. Pick the ideal time to visit San Antonio based on whether you prefer a bustling atmosphere or a more laid-back vibe.

  • The warmest month in San Antonio is August, with temperatures ranging between 23ºC and 40ºC. Lock in your flights from Lambert-St. Louis International Airport to San Antonio International Airport in this month if this is the type of weather you enjoy.

  • Search for cheap tickets from STL to SAT in January if you'd rather travel during cooler conditions. Temperatures are at their lowest around then, ranging between 3ºC and 20ºC on average.

More about San Antonio

  • Once you've booked your flights from STL to SAT, you'll need to find somewhere to stay in San Antonio. Make one of these accommodation options your base for exploring this top destination:

  • There are so many things to do and see in this city it can be tricky to work out where to start. The San Antonio River Walk, San Antonio Missions National Historical Park and San Fernando Cathedral are highlights which should be on every San Antonio itinerary.

Complete your San Antonio trip with hotels and a car rental

  • Comparing flights is not our only party trick. Once you've secured your cheap ticket to San Antonio International Airport, check out our great car rental deals that'll give you the freedom to travel around at your own pace. Next, have a look at our exclusive rates for hotels to find your ideal San Antonio stay.

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