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Cheap flights from St. Louis to San Antonio from $105

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to San Antonio departing on 9/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from St. Louis to San Antonio

Cheap round-trip flights

Frontier Logo
7:55 pm - 7:15 pmSTL-SAT
23h 20m1 stop
Frontier Logo
3:22 pm - 9:06 amSAT-STL
17h 44m1 stop
$205Frontier
Find Deal
Wed, Oct 1 - Sat, Oct 4
Frontier Logo
4:58 pm - 8:48 pmSTL-SAT
27h 50m1 stop
Frontier Logo
8:20 pm - 9:06 amSAT-STL
12h 46m1 stop
$207Frontier
Find Deal
Sat, Sep 6 - Mon, Sep 8
Southwest Logo
3:45 pm - 5:55 pmSTL-SAT
2h 10mnonstop
Southwest Logo
7:40 am - 9:45 amSAT-STL
2h 05mnonstop
$217Southwest
Find Deal
Wed, Oct 1 - Sat, Oct 4
Southwest Logo
3:45 pm - 5:55 pmSTL-SAT
2h 10mnonstop
Southwest Logo
10:25 am - 5:05 pmSAT-STL
6h 40m1 stop
$227Southwest
Find Deal
Wed, Oct 1 - Sat, Oct 4
American Airlines Logo
5:22 am - 1:19 pmSTL-SAT
7h 57m1 stop
American Airlines Logo
6:24 pm - 11:51 pmSAT-STL
5h 27m1 stop
$232American Airlines
Find Deal
Sat, Aug 23 - Sun, Aug 24
American Airlines Logo
5:26 am - 9:24 amSTL-SAT
3h 58m1 stop
American Airlines Logo
6:10 pm - 11:34 pmSAT-STL
5h 24m1 stop
$237American Airlines
Find Deal
Mon, Dec 8 - Mon, Dec 8
Delta Logo
9:10 am - 4:03 pmSTL-SAT
6h 53m1 stop
Delta Logo
6:21 pm - 11:41 pmSAT-STL
5h 20m1 stop
$243Delta
Find Deal
Tue, Oct 7 - Fri, Oct 10
United Airlines Logo
6:30 am - 3:53 pmSTL-SAT
9h 23m2 stops
United Airlines Logo
7:30 pm - 11:31 pmSAT-STL
4h 01m1 stop
$253United Airlines
Find Deal
Thu, Dec 25 - Tue, Dec 30
United Airlines Logo
6:15 am - 1:15 pmSTL-SAT
7h 00m1 stop
United Airlines Logo
5:56 pm - 10:00 pmSAT-STL
4h 04m1 stop
$254United Airlines
Find Deal
Mon, Oct 6 - Mon, Oct 13
Delta Logo
6:42 pm - 11:59 pmSTL-SAT
5h 17m1 stop
Delta Logo
6:11 pm - 11:24 pmSAT-STL
5h 13m1 stop
$259Delta
Find Deal
Fri, Sep 12 - Sun, Sep 14

Frontier flights from St. Louis to San Antonio

Our best Frontier deals on St. Louis to San Antonio flight tickets
Frontier
Oct 1
STL7:55 pmLambert-St Louis
23h 20m
1 stop
SAT7:15 pmSan Antonio
Oct 4
SAT3:22 pmSan Antonio
17h 44m
1 stop
STL9:06 amLambert-St Louis
$205
Find similar
Frontier
Sep 6
STL4:58 pmLambert-St Louis
27h 50m
1 stop
SAT8:48 pmSan Antonio
Sep 8
SAT8:20 pmSan Antonio
12h 46m
1 stop
STL9:06 amLambert-St Louis
$207
Find similar
Frontier
Aug 30
STL7:54 pmLambert-St Louis
23h 39m
1 stop
SAT7:33 pmSan Antonio
Sep 1
SAT8:18 pmSan Antonio
12h 53m
1 stop
STL9:11 amLambert-St Louis
$215
Find similar

United Airlines flights from St. Louis to San Antonio

Our best United Airlines deals on St. Louis to San Antonio flight tickets
United Airlines
Dec 25
STL6:30 amLambert-St Louis
9h 23m
2 stops
SAT3:53 pmSan Antonio
Dec 30
SAT7:30 pmSan Antonio
4h 01m
1 stop
STL11:31 pmLambert-St Louis
$253
Find similar
United Airlines
Oct 6
STL6:15 amLambert-St Louis
7h 00m
1 stop
SAT1:15 pmSan Antonio
Oct 13
SAT5:56 pmSan Antonio
4h 04m
1 stop
STL10:00 pmLambert-St Louis
$254
Find similar
United Airlines
Dec 5
STL6:15 amLambert-St Louis
4h 36m
1 stop
SAT10:51 amSan Antonio
Dec 7
SAT5:20 amSan Antonio
6h 55m
2 stops
STL12:15 pmLambert-St Louis
$255
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to San Antonio that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated July 31, 2025.
Use the filters below to find and compare flights from St. Louis to San Antonio that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Wed 10/1

7:55 pm-7:15 pm

1 stop23h 20m

San Antonio

Sat 10/4

3:22 pm-9:06 am

1 stop17h 44m

$205

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Sat 9/6

4:58 pm-8:48 pm

1 stop27h 50m

San Antonio

Mon 9/8

8:20 pm-9:06 am

1 stop12h 46m

$207

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Wed 10/1

3:45 pm-5:55 pm

Nonstop2h 10m

San Antonio

Sat 10/4

7:40 am-9:45 am

Nonstop2h 05m

$217

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Wed 10/1

3:45 pm-5:55 pm

Nonstop2h 10m

San Antonio

Sat 10/4

10:25 am-5:05 pm

1 stop6h 40m

$227

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Sat 8/23

5:22 am-1:19 pm

1 stop7h 57m

San Antonio

Sun 8/24

6:24 pm-11:51 pm

1 stop5h 27m

$232

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Mon 12/8

5:26 am-9:24 am

1 stop3h 58m

San Antonio

Mon 12/8

6:10 pm-11:34 pm

1 stop5h 24m

$237

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Tue 10/7

9:10 am-4:03 pm

1 stop6h 53m

San Antonio

Fri 10/10

6:21 pm-11:41 pm

1 stop5h 20m

$243

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Thu 12/25

6:30 am-3:53 pm

2 stops9h 23m

San Antonio

Tue 12/30

7:30 pm-11:31 pm

1 stop4h 01m

$253

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Mon 10/6

6:15 am-1:15 pm

1 stop7h 00m

San Antonio

Mon 10/13

5:56 pm-10:00 pm

1 stop4h 04m

$254

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Fri 9/12

6:42 pm-11:59 pm

1 stop5h 17m

San Antonio

Sun 9/14

6:11 pm-11:24 pm

1 stop5h 13m

$259

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 San Antonio from

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

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 cheapest month to fly to San Antonio?

If you aren’t able to travel during the month of April, then book flights to San Antonio from St. Louis during August instead. Flights to San Antonio in August, while not as cheap as those in April, still average around $298.

What is the cheapest day to depart on your flight to San Antonio?

The cheapest day to depart on your flight to San Antonio is on a Tuesday when prices can be found for as low as $370. This is often the case because there is less demand to fly during this day of the week. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to San Antonio on Sunday is $461.

What is the cheapest time of day to depart on your flight to San Antonio?

According to our data, the cheapest time of day to fly to San Antonio is in the afternoon. momondo users have found flights departing from St. Louis to San Antonio in the afternoon for as low as $370. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to San Antonio are more costly in the evening, with an average ticket price of $438. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

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

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

How far in advance should I book a flight to San Antonio?

You are more likely to see cheaper flights to San Antonio from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to San Antonio for around $325 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Antonio from St. Louis for as low as $261 on momondo.

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

There are 1 cabin classes available to choose from on Lambert-St Louis to San Antonio 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 St. Louis to San Antonio flights?

You could potentially save up to 9% on your flight if you consider stops on a St. Louis to San Antonio flight.

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

As of July 2025, prices for St. Louis to San Antonio flights are approximately 10% cheaper when compared to flights at the same time last year.

When to book flights from St. Louis to San Antonio

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

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

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

Best Price Found

$105

Fastest flight time

2h 05m

Direct flights

Every day

Airports in San Antonio

1 airport
The best one-way flight to San Antonio from St. Louis in the past 72 hours is $105. The best round-trip flight deal from St. Louis to San Antonio found on momondo in the last 72 hours is $205.
The fastest flight from St. Louis to San Antonio takes 2h 05m
Direct flights go from St. Louis to San Antonio every day.
There is 1 airport near San Antonio: San Antonio (SAT)
Search flight deals

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

    There are 792.4 mi between Lambert-St Louis and San Antonio. 2h 05m is a normal flight duration for this route.

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

    Prices for flights from Lambert-St Louis Airport to San Antonio Airport are updated daily.

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

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to San Antonio Airport.

  • What documentation or ID do you need to fly to San Antonio Airport?

    The travel and health documents you'll need for your trip to San Antonio Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at San Antonio Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

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

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

Best airlines flying from St. Louis to San Antonio

Compare and see reviews for airlines that fly from St. Louis to San Antonio with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $124Free CancellationRating
8.0
7,981 reviews
Search Delta flights
FrontierPriceFrom $128Free CancellationRating
5.9
3,239 reviews
Search Frontier flights
SouthwestPriceFrom $200Free CancellationRating
8.0
4,246 reviews
Search Southwest flights
United AirlinesPriceFrom $217Free CancellationRating
7.4
8,900 reviews
Search United Airlines flights
American AirlinesPriceFrom $218Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights

  • Southwest Flights From St. Louis to San Antonio

    The lowest priced Southwest flight from St. Louis to San Antonio from the last 72 hours was $200. Generally, Southwest has 6 flights on this route every week with an average price of $394. Southwest is rated 8.0/10 by our users.

Traveling to a place near San Antonio?

Book flights to San Antonio if you plan to visit one of these locations
New Braunfels
Kerrville
Boerne
Schertz
Pleasanton

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to San Antonio from St. Louis.

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

Flights from St. Louis to San Antonio with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to San Antonio from St. Louis.

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

Of course. momondo tracks the price of St. Louis to San Antonio flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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