$89 Cheap Flights from St. Louis (STL) to San Antonio (SAT)

View $89 flight on Fri, Nov 14, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to San Antonio International Airport (SAT)

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

Prices were available within the past 7 days and start at $89 for one-way flights and $185 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Fri, Nov 14 - Mon, Nov 17
STL
St. Louis
SAT
San Antonio
$185 Roundtrip, found 2 hours ago
$185
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Fri, Nov 14 from St. Louis to San Antonio, returning Mon, Nov 17, priced at $185 found 2 hours ago
Frontier Airlines
Fri, Oct 24 - Mon, Oct 27
STL
St. Louis
SAT
San Antonio
$195 Roundtrip, found 4 hours ago
$195
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Fri, Oct 24 from St. Louis to San Antonio, returning Mon, Oct 27, priced at $195 found 4 hours ago
United
Wed, Dec 17 - Sun, Dec 21
STL
St. Louis
SAT
San Antonio
$214 Roundtrip, found 1 day ago
$214
Roundtrip
found 1 day ago
Select United flight, departing Wed, Dec 17 from St. Louis to San Antonio, returning Sun, Dec 21, priced at $214 found 1 day ago
United
Sat, Feb 7 - Tue, Feb 10
STL
St. Louis
SAT
San Antonio
$216 Roundtrip, found 2 days ago
$216
Roundtrip
found 2 days ago
Select United flight, departing Sat, Feb 7 from St. Louis to San Antonio, returning Tue, Feb 10, priced at $216 found 2 days ago
American Airlines
Sat, Feb 14 - Sat, Feb 21
STL
St. Louis
SAT
San Antonio
$219 Roundtrip, found 2 days ago
$219
Roundtrip
found 2 days ago
Select American Airlines flight, departing Sat, Feb 14 from St. Louis to San Antonio, returning Sat, Feb 21, priced at $219 found 2 days ago
Delta
Thu, Dec 25 - Tue, Dec 30
STL
St. Louis
SAT
San Antonio
$220 Roundtrip, found 1 day ago
$220
Roundtrip
found 1 day ago
Select Delta flight, departing Thu, Dec 25 from St. Louis to San Antonio, returning Tue, Dec 30, priced at $220 found 1 day ago
Frontier Airlines
Fri, Nov 14 - Mon, Nov 17
STL
St. Louis
SAT
San Antonio
$223 Roundtrip, found 2 hours ago
$223
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Fri, Nov 14 from St. Louis to San Antonio, returning Mon, Nov 17, priced at $223 found 2 hours ago
Southwest Airlines
Thu, Dec 25 - Tue, Dec 30
STL
St. Louis
SAT
San Antonio
$224 Roundtrip, found 1 day ago
$224
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Thu, Dec 25 from St. Louis to San Antonio, returning Tue, Dec 30, priced at $224 found 1 day ago
United
Sat, Feb 7 - Tue, Feb 10
STL
St. Louis
SAT
San Antonio
$226 Roundtrip, found 2 days ago
$226
Roundtrip
found 2 days ago
Select United flight, departing Sat, Feb 7 from St. Louis to San Antonio, returning Tue, Feb 10, priced at $226 found 2 days ago
Spirit Airlines
Thu, Oct 30 - Tue, Nov 4
STL
St. Louis
SAT
San Antonio
$227 Roundtrip, found 9 hours ago
$227
Roundtrip
found 9 hours ago
Select Spirit Airlines flight, departing Thu, Oct 30 from St. Louis to San Antonio, returning Tue, Nov 4, priced at $227 found 9 hours ago

Find the cheapest month to fly from St. Louis (STL) to San Antonio (SAT)

November is typically the cheapest month to fly

From $150 - $561 per traveler.

Alternative airports near San Antonio

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

Select flight to San Antonio Intl. SAT. Cheapest and Closest option available. Average driving time to city center is 11 minutes. Flights from $516
SAT
San Antonio Intl.
CheapestClosest
Average driving time to city center11 min
Flights from $516
Flights from St. Louis (STL) to San Antonio (SAT)
Origin airport
Lambert-St. Louis Intl.
Destination airport
San Antonio Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, Spirit Airlines, United
Roundtrip price
$185
Distance
786 mi
Average flight time
3 hours 6 mins

St. Louis to San Antonio Flights

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

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

 

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

Sunday is one of the best days to book for cheap flights from St. Louis to San Antonio: 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 St. Louis to San Antonio

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 St. Louis to San Antonio in 2025. You can also book with separate airlines for your outbound and return journeys, from $89 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 St. Louis to San Antonio 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 St. Louis to San Antonio 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.

 

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to San Antonio Intl. Airport (SAT) cost?
Lock in a cheap one-way flight from $89 or cheap return flight from $185 from Lambert-St. Louis Intl. Airport (STL) to San Antonio Intl. Airport (SAT) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to San Antonio Intl. Airport (SAT)?
The cheapest month to fly from STL to SAT is November, when there's less demand. Off-peak season is typically when better flight deals are available between these airports.
Which airlines fly direct from Lambert-St. Louis Intl. Airport (STL) to San Antonio Intl. Airport (SAT)?
Hop on a nonstop flight with Southwest Airlines and travel straight from Lambert-St. Louis Intl. Airport (STL) to San Antonio Intl. Airport (SAT).
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to San Antonio Intl. Airport (SAT)?
Expedia's filter tool lets you easily compare airlines, flight times and fares all in one place. Tailor the search to your trip, then sort by "Price (lowest to highest)" to find the carrier with the cheapest STL to SAT flight.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to San Antonio Intl. Airport (SAT)?
On average, only 1 direct flight departs each day from Lambert-St. Louis Intl. Airport (STL) to San Antonio Intl. Airport (SAT). Need more options? Use Expedia's filters to find flights with layovers and squeeze another destination into your itinerary.
What are the most popular departure times for flights from Lambert-St. Louis Intl. Airport (STL) to San Antonio Intl. Airport (SAT)?
The 11 AM departures from STL to SAT are the most sought after. Prices can be higher for these popular slots. If you want to save on your trip, choose a less crowded time to fly.
What day of the week has the most flights from STL to SAT?
If you travel on a Friday, you'll get the greatest range of options for flights from Lambert-St. Louis Intl. Airport (STL) to San Antonio Intl. Airport (SAT).
What is the earliest flight from Lambert-St. Louis Intl. Airport (STL) to San Antonio Intl. Airport (SAT)?
Catch the earliest flight at around 11:15AM UTC-6, leaving from Lambert-St. Louis Intl. Airport (STL). You'll be flying for approximately 2h 25m, touching down at San Antonio Intl. Airport (SAT) at approximately 1:40PM UTC-6.
How long does it take to fly from Lambert-St. Louis Intl. Airport (STL) to San Antonio Intl. Airport (SAT)?
The average flight duration from STL to SAT is 2 hours and 25 minutes, covering a distance of 790 mi.
What airline has the least delays from STL to SAT?
Southwest Airlines has the strongest track record for on-time direct flights from Lambert-St. Louis Intl. Airport (STL) to San Antonio Intl. Airport (SAT), with an on-time rating of 86%. Use the Expedia App to view your flight status before you leave and get immediate updates about any trip changes.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to San Antonio Intl. Airport (SAT)?
To avoid possible delays on the Lambert-St. Louis Intl. Airport (STL) to San Antonio Intl. Airport (SAT) route, travel before 3 PM. Departures after this hour are 22% more likely to be canceled.**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 San Antonio from Lambert-St. Louis Intl. Airport (STL)?
Explore your flight options from Lambert-St. Louis Intl. Airport (STL) to San Antonio Intl. Airport (SAT). This is the only San Antonio airport you can touch down at if you're taking a direct flight.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to San Antonio Intl. Airport (SAT) last-minute?
Booking your flight from STL to SAT just before your getaway is usually more expensive. But if you're flexible with your departure dates and times, you could score a cheap last-minute fare.
Is it cheaper to book a STL to SAT flight and hotel package?
Securing a STL to SAT flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels in one place. Pick from our impressive range of stays and then add car rentals, flights and activities to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to San Antonio Intl. Airport (SAT)?
It's usually possible to reschedule or cancel your STL to SAT flight. However, for bookings made more than 24 hours ago, 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 further details on our Customer Service portal.

Explore a world of travel with Expedia

*Available to One Key members.