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Cheap flights from San Antonio to St. Louis from $99

1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from San Antonio to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
1:55 pm - 7:58 pmSAT  San Antonio-STL Lambert-St Louis
6h 03m1 stop Atlanta Hartsfield-Jackson
Delta Logo
6:00 am - 12:49 pmSTL  Lambert-St Louis-SAT San Antonio
6h 49m1 stop Atlanta Hartsfield-Jackson
$187Delta
Wed, Sep 23 - Wed, Sep 30
Frontier Logo
8:20 pm - 7:17 pmSAT  San Antonio-STL Lambert-St Louis
22h 57m1 stop Denver Intl
Frontier Logo
8:10 pm - 7:25 pmSTL  Lambert-St Louis-SAT San Antonio
23h 15m1 stop Denver Intl
$239Frontier
Thu, Sep 10 - Mon, Sep 14
Frontier Logo
8:20 pm - 7:17 pmSAT  San Antonio-STL Lambert-St Louis
22h 57m1 stop Denver Intl
Frontier Logo
8:10 pm - 7:25 pmSTL  Lambert-St Louis-SAT San Antonio
23h 15m1 stop Denver Intl
$254Frontier
Fri, Sep 18 - Mon, Sep 21
United Airlines Logo
5:30 am - 3:38 pmSAT  San Antonio-STL Lambert-St Louis
10h 08m2 stops Houston George Bush Intcntl Chicago O'Hare Intl
United Airlines Logo
8:00 am - 3:53 pmSTL  Lambert-St Louis-SAT San Antonio
7h 53m2 stops Chicago O'Hare Intl Houston George Bush Intcntl
$288United Airlines
Wed, Sep 23 - Wed, Sep 30
Southwest Logo
7:20 am - 9:25 amSAT  San Antonio-STL Lambert-St Louis
2h 05mnonstop
Southwest Logo
8:45 pm - 11:00 pmSTL  Lambert-St Louis-SAT San Antonio
2h 15mnonstop
$327Southwest
Thu, Sep 10 - Mon, Sep 14
Southwest Logo
3:30 pm - 5:40 pmSAT  San Antonio-STL Lambert-St Louis
2h 10mnonstop
Southwest Logo
8:40 am - 10:50 amSTL  Lambert-St Louis-SAT San Antonio
2h 10mnonstop
$327Southwest
Tue, Sep 15 - Tue, Sep 22
United Airlines Logo
7:35 am - 3:43 pmSAT  San Antonio-STL Lambert-St Louis
8h 08m2 stops Houston George Bush Intcntl Chicago O'Hare Intl
United Airlines Logo
3:12 pm - 7:28 pmSTL  Lambert-St Louis-SAT San Antonio
4h 16m1 stop Houston George Bush Intcntl
$337United Airlines
Tue, Oct 6 - Fri, Oct 9
United Airlines Logo
7:35 am - 2:13 pmSAT  San Antonio-STL Lambert-St Louis
6h 38m1 stop Houston George Bush Intcntl
United Airlines Logo
6:15 am - 10:46 amSTL  Lambert-St Louis-SAT San Antonio
4h 31m1 stop Houston George Bush Intcntl
$342United Airlines
Wed, Nov 11 - Sat, Nov 14
American Airlines Logo
6:48 pm - 12:27 amSAT  San Antonio-STL Lambert-St Louis
5h 39m1 stop Chicago O'Hare Intl
American Airlines Logo
5:18 pm - 11:55 pmSTL  Lambert-St Louis-SAT San Antonio
6h 37m1 stop Chicago O'Hare Intl
$347American Airlines
Fri, Sep 18 - Fri, Sep 25
American Airlines Logo
5:00 am - 9:24 amSAT  San Antonio-STL Lambert-St Louis
4h 24m1 stop Dallas/Fort Worth
American Airlines Logo
5:00 pm - 10:50 pmSTL  Lambert-St Louis-SAT San Antonio
5h 50m1 stop Dallas/Fort Worth
$367American Airlines
Thu, Sep 17 - Sat, Sep 19

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Frontier flights from San Antonio to St. Louis

Our best Frontier deals on San Antonio to St. Louis flight tickets
Frontier
Oct 16
SAT8:21 pmSan Antonio
22h 36m
1 stop
STL6:57 pmLambert-St Louis
Oct 19
STL8:00 pmLambert-St Louis
23h 26m
1 stop
SAT7:26 pmSan Antonio
$236
Frontier
Sep 10
SAT8:20 pmSan Antonio
22h 57m
1 stop
STL7:17 pmLambert-St Louis
Sep 14
STL8:10 pmLambert-St Louis
23h 15m
1 stop
SAT7:25 pmSan Antonio
$239
Frontier
Sep 18
SAT8:20 pmSan Antonio
22h 57m
1 stop
STL7:17 pmLambert-St Louis
Sep 21
STL8:10 pmLambert-St Louis
23h 15m
1 stop
SAT7:25 pmSan Antonio
$254

United Airlines flights from San Antonio to St. Louis

Our best United Airlines deals on San Antonio to St. Louis flight tickets
United Airlines
Sep 23
SAT5:30 amSan Antonio
10h 08m
2 stops
STL3:38 pmLambert-St Louis
Sep 30
STL8:00 amLambert-St Louis
7h 53m
2 stops
SAT3:53 pmSan Antonio
$288
United Airlines
Nov 11
SAT7:35 amSan Antonio
6h 38m
1 stop
STL2:13 pmLambert-St Louis
Nov 14
STL6:15 amLambert-St Louis
4h 31m
1 stop
SAT10:46 amSan Antonio
$342
United Airlines
Sep 2
SAT12:00 pmSan Antonio
10h 00m
2 stops
STL10:00 pmLambert-St Louis
Sep 6
STL11:15 amLambert-St Louis
4h 28m
1 stop
SAT3:43 pmSan Antonio
$564

momondo Fare Finder

 
Use the filters below to find and compare flights from San Antonio to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San AntonioSt. Louis

SAT San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Wed 9/23

1:55 pm-7:58 pm

1 stop6h 03m

Lambert-St Louis

Wed 9/30

6:00 am-12:49 pm

1 stop6h 49m

$187

San AntonioSt. Louis

SAT San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Thu 9/10

8:20 pm-7:17 pm

1 stop22h 57m

Lambert-St Louis

Mon 9/14

8:10 pm-7:25 pm

1 stop23h 15m

$239

San AntonioSt. Louis

SAT San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Fri 9/18

8:20 pm-7:17 pm

1 stop22h 57m

Lambert-St Louis

Mon 9/21

8:10 pm-7:25 pm

1 stop23h 15m

$254

San AntonioSt. Louis

SAT San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Wed 9/23

5:30 am-3:38 pm

2 stops10h 08m

Lambert-St Louis

Wed 9/30

8:00 am-3:53 pm

2 stops7h 53m

$288
Quickest round-trip

San AntonioSt. Louis

SAT San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Thu 9/10

7:20 am-9:25 am

Nonstop2h 05m

Lambert-St Louis

Mon 9/14

8:45 pm-11:00 pm

Nonstop2h 15m

$327

San AntonioSt. Louis

SAT San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Tue 9/15

3:30 pm-5:40 pm

Nonstop2h 10m

Lambert-St Louis

Tue 9/22

8:40 am-10:50 am

Nonstop2h 10m

$327

San AntonioSt. Louis

SAT San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Tue 10/6

7:35 am-3:43 pm

2 stops8h 08m

Lambert-St Louis

Fri 10/9

3:12 pm-7:28 pm

1 stop4h 16m

$337

San AntonioSt. Louis

SAT San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Wed 11/11

7:35 am-2:13 pm

1 stop6h 38m

Lambert-St Louis

Sat 11/14

6:15 am-10:46 am

1 stop4h 31m

$342

San AntonioSt. Louis

SAT San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Fri 9/18

6:48 pm-12:27 am

1 stop5h 39m

Lambert-St Louis

Fri 9/25

5:18 pm-11:55 pm

1 stop6h 37m

$347

San AntonioSt. Louis

SAT San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Thu 9/17

5:00 am-9:24 am

1 stop4h 24m

Lambert-St Louis

Sat 9/19

5:00 pm-10:50 pm

1 stop5h 50m

$367

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to St. Louis from

How to get the cheapest flight ticket from San Antonio to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between San Antonio and St. Louis?

Prices are currently low for flights on this route.

Typical prices usually range from $342 to $502.
The lowest price recently found on this route was $239.

What is the cheapest month to fly to St. Louis?

In general, February is the cheapest month to fly from San Antonio to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $313. The month of December is another great option to travel to St. Louis, with average flight prices from San Antonio averaging around $348.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Thursday when prices can be found for as low as $375. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $496. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from San Antonio in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $385 when looking at flights departing in the afternoon. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $531 per ticket.

What is the cheapest San Antonio to Lambert-St Louis flight route?

Fly from San Antonio to Lambert-St Louis for the best San Antonio - Lambert-St Louis flight prices

What cabin class options are available on San Antonio to St. Louis flights?

There is only 1 cabin class available to choose from on San Antonio to St. Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on San Antonio to St. Louis flights?

You could potentially save up to 47% on your flight if you consider stops on a San Antonio to St. Louis flight.

How have San Antonio to St. Louis flight prices changed over time?

As of August 2026, prices for San Antonio to St. Louis flights are approximately 59% more expensive when compared to flights at the same time last year.

When to book flights from San Antonio to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from San Antonio to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap San Antonio to St. Louis (SAT to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from San Antonio to St. Louis

Best Price Found

$99

Fastest flight time

2h 00m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from San Antonio in the past 72 hours is $99. The best round-trip flight deal from San Antonio to St. Louis found on momondo in the last 72 hours is $187.
The fastest flight from San Antonio to St. Louis takes 2h 00m
Direct flights go from San Antonio to St. Louis every day.
There is 1 airport in St. Louis. From San Antonio there are direct flights to Lambert-St Louis (STL).
Search flight deals

Frequently asked questions about flying from San Antonio to St. Louis

  • How far is San Antonio to Lambert-St Louis by plane?

    San Antonio and Lambert-St Louis are 792.4 mi apart from one another. By plane, this route typically takes 2h 00m.

  • When did momondo last update prices for flights from San Antonio Airport to Lambert-St Louis Airport?

    Prices for flights from San Antonio Airport to Lambert-St Louis Airport were last updated today.

  • How many operators does momondo search for flights from San Antonio Airport to Lambert-St Louis Airport?

  • How old do you have to be to fly from San Antonio Airport to Lambert-St Louis Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from San Antonio Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The required travel and health documents for your Lambert-St Louis Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Lambert-St Louis Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from San Antonio to St. Louis?

  • What is the most popular airline from San Antonio to St. Louis?

Best airlines flying from San Antonio to St. Louis

Compare and see reviews for airlines that fly from San Antonio to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $196Free CancellationRating
7.4
10,102 reviews
Search United Airlines flights
American AirlinesPriceFrom $248Free CancellationRating
7.1
11,974 reviews
Search American Airlines flights
SouthwestPriceFrom $267Free CancellationRating
8.0
4,215 reviews
Search Southwest flights

  • Southwest Flights From San Antonio to St. Louis

    Southwest flies from San Antonio to St. Louis around 3 times per week, with 4,215 momondo users rating the airline 8.0/10. The cheapest Southwest deal from San Antonio to St. Louis in the last 72 hours was $267 (round-trip), much lower than the average airfare cost of $464 for Southwest flights on this route.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Fairview Heights
Maryland Heights
St. Peters
Hermann
Collinsville
Florissant
Alton
O'Fallon
Farmington
Clayton
Fenton
Festus
Wentzville
Eureka
Edwardsville
Litchfield
Grafton
Shrewsbury

Why use momondo?

Why should I use momondo to find a flight deal from San Antonio to St. Louis?

It is quick and easy to find San Antonio to St. Louis flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to St. Louis that suits you.

Can I find flights from San Antonio to St. Louis with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to St. Louis from San Antonio with this policy.

How can momondo help me find flights from San Antonio to St. Louis?

Once all potential San Antonio to St. Louis flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from San Antonio to St. Louis right now. Can momondo alert me if prices change?

Yes. momondo can track prices for San Antonio to St. Louis flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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