$66 Cheap Flights from San Antonio (SAT) to St. Louis (STL)

View $66 flight on Thu, Nov 13, 2025Opens in a new window

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

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

Prices were available within the past 7 days and start at $66 for one-way flights and $158 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Thu, Nov 20 - Thu, Nov 27
SAT
San Antonio
STL
St. Louis
$158 Roundtrip, found 2 days ago
$158
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Thu, Nov 20 from San Antonio to St. Louis, returning Thu, Nov 27, priced at $158 found 2 days ago
Frontier Airlines
Thu, Nov 13 - Thu, Nov 20
SAT
San Antonio
STL
St. Louis
$163 Roundtrip, found 2 days ago
$163
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Thu, Nov 13 from San Antonio to St. Louis, returning Thu, Nov 20, priced at $163 found 2 days ago
Frontier Airlines
Thu, Nov 20 - Wed, Dec 24
SAT
San Antonio
STL
St. Louis
$168 Roundtrip, found 6 days ago
$168
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Thu, Nov 20 from San Antonio to St. Louis, returning Wed, Dec 24, priced at $168 found 6 days ago
American Airlines
Sat, Dec 13 - Sun, Dec 14
SAT
San Antonio
STL
St. Louis
$173 Roundtrip, found 6 days ago
$173
Roundtrip
found 6 days ago
Select American Airlines flight, departing Sat, Dec 13 from San Antonio to St. Louis, returning Sun, Dec 14, priced at $173 found 6 days ago
Frontier Airlines
Thu, Dec 4 - Sun, Dec 7
SAT
San Antonio
STL
St. Louis
$173 Roundtrip, found 13 hours ago
$173
Roundtrip
found 13 hours ago
Select Frontier Airlines flight, departing Thu, Dec 4 from San Antonio to St. Louis, returning Sun, Dec 7, priced at $173 found 13 hours ago
Frontier Airlines
Thu, Nov 20 - Sun, Nov 23
SAT
San Antonio
STL
St. Louis
$174 Roundtrip, found 2 days ago
$174
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Thu, Nov 20 from San Antonio to St. Louis, returning Sun, Nov 23, priced at $174 found 2 days ago
Southwest Airlines
Wed, Dec 24 - Tue, Dec 30
SAT
San Antonio
STL
St. Louis
$176 Roundtrip, found 6 days ago
$176
Roundtrip
found 6 days ago
Select Southwest Airlines flight, departing Wed, Dec 24 from San Antonio to St. Louis, returning Tue, Dec 30, priced at $176 found 6 days ago
Delta
Thu, Jan 22 - Sun, Jan 25
SAT
San Antonio
STL
St. Louis
$177 Roundtrip, found 5 days ago
$177
Roundtrip
found 5 days ago
Select Delta flight, departing Thu, Jan 22 from San Antonio to St. Louis, returning Sun, Jan 25, priced at $177 found 5 days ago
Frontier Airlines
Thu, Dec 11 - Sun, Dec 14
SAT
San Antonio
STL
St. Louis
$185 Roundtrip, found 1 day ago
$185
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Thu, Dec 11 from San Antonio to St. Louis, returning Sun, Dec 14, priced at $185 found 1 day ago
United
Thu, Jan 22 - Sun, Jan 25
SAT
San Antonio
STL
St. Louis
$190 Roundtrip, found 5 days ago
$190
Roundtrip
found 5 days ago
Select United flight, departing Thu, Jan 22 from San Antonio to St. Louis, returning Sun, Jan 25, priced at $190 found 5 days ago

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

January is typically the cheapest month to fly

From $158 - $643 per traveler.

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 $1,184
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $1,184
Flights from San Antonio (SAT) to St. Louis (STL)
Origin airport
San Antonio Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, Spirit Airlines, United
Roundtrip price
$157
Distance
786 mi
Average flight time
2 hours 22 mins

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 November. 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 $66 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.

 

Frequently asked questions

How much does a flight from San Antonio Intl. Airport (SAT) to Lambert-St. Louis Intl. Airport (STL) cost?
Get a cheap one-way flight from $66 or cheap return flight from $158 from San Antonio Intl. Airport (SAT) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from San Antonio Intl. Airport (SAT) to Lambert-St. Louis Intl. Airport (STL)?
The cheapest month to fly from SAT to STL is November, when demand is low. Off-peak months are generally when airlines offer better prices between these airports.
Which airlines fly direct from San Antonio Intl. Airport (SAT) to Lambert-St. Louis Intl. Airport (STL)?
If you're departing from San Antonio Intl. Airport (SAT), you can board a nonstop flight to Lambert-St. Louis Intl. Airport (STL) with Southwest Airlines.
What is the cheapest airline that flies from San Antonio Intl. Airport (SAT) to Lambert-St. Louis Intl. Airport (STL)?
To find the cheapest airline that'll fly you from SAT to STL, use Expedia's filter tool. Tailor your search based on your travel style, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from San Antonio Intl. Airport (SAT) to Lambert-St. Louis Intl. Airport (STL)?
On average, you'll only find 1 nonstop flight operating from San Antonio Intl. Airport (SAT) to Lambert-St. Louis Intl. Airport (STL) per day. If this isn't convenient for you, think about flights with a layover. Just filter your search results on Expedia to include one or more stops to discover the next best option.
What are the most popular departure times for flights from San Antonio Intl. Airport (SAT) to Lambert-St. Louis Intl. Airport (STL)?
Flights between SAT and STL are their busiest at 12 PM. If you're after a more relaxed experience and possibly cheaper prices, look for a departure that's outside typical rush times.
What day of the week has the most flights from SAT to STL?
If you jet off on a Friday, you'll get the biggest range of options for flights from San Antonio Intl. Airport (SAT) to Lambert-St. Louis Intl. Airport (STL).
What is the earliest flight from San Antonio Intl. Airport (SAT) to Lambert-St. Louis Intl. Airport (STL)?
Hop on the earliest flight at around 8:25AM UTC-6, departing from San Antonio Intl. Airport (SAT). You'll be flying for approximately 2h, touching down at Lambert-St. Louis Intl. Airport (STL) at approximately 10:25AM UTC-6.
How long does it take to fly from San Antonio Intl. Airport (SAT) to Lambert-St. Louis Intl. Airport (STL)?
Typically, it takes 2 hours and 4 minutes to cover the 790 mi from SAT to STL.
What airline has the least delays from SAT to STL?
Southwest Airlines has the strongest track record for on-time direct flights from San Antonio Intl. Airport (SAT) to Lambert-St. Louis Intl. Airport (STL), with an on-time rating of 87%. Use the Expedia App to view your flight schedule before you take off and get real-time updates about any trip changes.
What is the best time to fly from San Antonio Intl. Airport (SAT) to Lambert-St. Louis Intl. Airport (STL)?
To reach Lambert-St. Louis Intl. Airport (STL) on schedule, pick a flight that leaves San Antonio Intl. Airport (SAT) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**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 St. Louis from San Antonio Intl. Airport (SAT)?
Explore your flight options from San Antonio Intl. Airport (SAT) to Lambert-St. Louis Intl. Airport (STL). This is the only airport in St. Louis you can touch down at if you're taking a direct flight.
Is it cheaper to buy a plane ticket from San Antonio Intl. Airport (SAT) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Booking your ticket from SAT to STL just before your journey is usually more expensive. However, if there's some wiggle room with your travel times and dates, you could bag a cheap last-minute fare.
Is it cheaper to book a SAT to STL flight and hotel package?
You can save money by securing a SAT to STL flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's easy to manage everything in one place. After choosing your preferred flights and accommodations, consider adding extras like tours, car rentals and activities.
Can I cancel or change the date of my flight from San Antonio Intl. Airport (SAT) to Lambert-St. Louis Intl. Airport (STL)?
Typically, you're able to cancel or reschedule your SAT to STL flight. However, additional charges may apply, especially if your booking was made more than 24 hours ago. Double-check your itinerary for the airline's fees and policies on flight changes, or if you need more details, visit our Customer Service portal.

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*Available to One Key members.