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Cheap flights from St. Louis to San Antonio from $69

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 3/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from St. Louis to San Antonio

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
10:11 pm - 9:58 am
STL
-
SAT
11h 47m
1 stop
Frontier Logo
2:13 pm - 11:59 pm
SAT
-
STL
9h 46m
1 stop
$148Frontier
Thu, Feb 26 - Sat, Feb 28
Multiple Airlines Logo
3:49 pm - 11:59 pm
STL
-
SAT
8h 10m
1 stop
Multiple Airlines Logo
5:04 pm - 6:51 am
SAT
-
STL
13h 47m
1 stop
$162Multiple Airlines
Fri, Feb 27 - Sun, Mar 1
Multiple Airlines Logo
3:49 pm - 11:59 pm
STL
-
SAT
8h 10m
1 stop
Multiple Airlines Logo
5:04 pm - 6:51 am
SAT
-
STL
13h 47m
1 stop
$172Multiple Airlines
Fri, Feb 27 - Sun, Mar 1
Frontier Logo
10:11 pm - 9:58 am
STL
-
SAT
11h 47m
1 stop
Frontier Logo
9:33 am - 7:52 pm
SAT
-
STL
10h 19m
1 stop
$175Frontier
Thu, Feb 26 - Mon, Mar 2
Frontier Logo
3:49 pm - 1:12 pm
STL
-
SAT
21h 23m
1 stop
Frontier Logo
9:33 am - 7:52 pm
SAT
-
STL
10h 19m
1 stop
$176Frontier
Wed, Feb 25 - Mon, Mar 2
Frontier Logo
10:11 pm - 9:58 am
STL
-
SAT
11h 47m
1 stop
Frontier Logo
5:08 pm - 10:27 pm
SAT
-
STL
29h 19m
2 stops
$177Frontier
Thu, Feb 26 - Mon, Mar 2
Frontier Logo
1:40 pm - 4:17 pm
STL
-
SAT
26h 37m
1 stop
Frontier Logo
8:25 pm - 1:09 pm
SAT
-
STL
16h 44m
1 stop
$181Frontier
Mon, Feb 9 - Thu, Feb 12
Frontier Logo
4:51 pm - 7:25 pm
STL
-
SAT
26h 34m
1 stop
Frontier Logo
5:08 pm - 10:27 pm
SAT
-
STL
29h 19m
2 stops
$182Frontier
Wed, Feb 25 - Mon, Mar 2
Multiple Airlines Logo
3:49 pm - 11:59 pm
STL
-
SAT
8h 10m
1 stop
Multiple Airlines Logo
8:25 pm - 9:49 am
SAT
-
STL
13h 24m
1 stop
$185Multiple Airlines
Tue, Mar 3 - Thu, Mar 5
Multiple Airlines Logo
3:49 pm - 11:59 pm
STL
-
SAT
8h 10m
1 stop
Multiple Airlines Logo
5:08 pm - 10:27 pm
SAT
-
STL
29h 19m
2 stops
$188Multiple Airlines
Sat, Feb 28 - Mon, Mar 2

Frontier flights from St. Louis to San Antonio

Our best Frontier deals on St. Louis to San Antonio flight tickets
Frontier
Feb 26
STL10:11 pmLambert-St Louis
11h 47m
1 stop
SAT9:58 amSan Antonio
Feb 28
SAT2:13 pmSan Antonio
9h 46m
1 stop
STL11:59 pmLambert-St Louis
$148
Frontier
Feb 26
STL10:11 pmLambert-St Louis
11h 47m
1 stop
SAT9:58 amSan Antonio
Mar 2
SAT9:33 amSan Antonio
10h 19m
1 stop
STL7:52 pmLambert-St Louis
$175
Frontier
Feb 25
STL3:49 pmLambert-St Louis
21h 23m
1 stop
SAT1:12 pmSan Antonio
Mar 2
SAT9:33 amSan Antonio
10h 19m
1 stop
STL7:52 pmLambert-St Louis
$176

American Airlines flights from St. Louis to San Antonio

Our best American Airlines deals on St. Louis to San Antonio flight tickets
American Airlines
May 2
STL5:20 amLambert-St Louis
4h 16m
1 stop
SAT9:36 amSan Antonio
May 5
SAT3:11 pmSan Antonio
4h 19m
1 stop
STL7:30 pmLambert-St Louis
$237
American Airlines
Feb 17
STL5:52 pmLambert-St Louis
6h 03m
1 stop
SAT11:55 pmSan Antonio
Feb 22
SAT5:00 amSan Antonio
3h 55m
1 stop
STL8:55 amLambert-St Louis
$269
American Airlines
Feb 6
STL3:54 pmLambert-St Louis
8h 04m
1 stop
SAT11:58 pmSan Antonio
Feb 15
SAT5:00 amSan Antonio
6h 01m
1 stop
STL11:01 amLambert-St Louis
$315

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 January 28, 2026.
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

Thu 2/26

10:11 pm-9:58 am

1 stop11h 47m

San Antonio

Sat 2/28

2:13 pm-11:59 pm

1 stop9h 46m

$148

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Fri 2/27

3:49 pm-11:59 pm

1 stop8h 10m

San Antonio

Sun 3/1

5:04 pm-6:51 am

1 stop13h 47m

$162

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Fri 2/27

3:49 pm-11:59 pm

1 stop8h 10m

San Antonio

Sun 3/1

5:04 pm-6:51 am

1 stop13h 47m

$172

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Thu 2/26

10:11 pm-9:58 am

1 stop11h 47m

San Antonio

Mon 3/2

9:33 am-7:52 pm

1 stop10h 19m

$175

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Wed 2/25

3:49 pm-1:12 pm

1 stop21h 23m

San Antonio

Mon 3/2

9:33 am-7:52 pm

1 stop10h 19m

$176

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Thu 2/26

10:11 pm-9:58 am

1 stop11h 47m

San Antonio

Mon 3/2

5:08 pm-10:27 pm

2 stops29h 19m

$177

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Mon 2/9

1:40 pm-4:17 pm

1 stop26h 37m

San Antonio

Thu 2/12

8:25 pm-1:09 pm

1 stop16h 44m

$181

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Wed 2/25

4:51 pm-7:25 pm

1 stop26h 34m

San Antonio

Mon 3/2

5:08 pm-10:27 pm

2 stops29h 19m

$182

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Tue 3/3

3:49 pm-11:59 pm

1 stop8h 10m

San Antonio

Thu 3/5

8:25 pm-9:49 am

1 stop13h 24m

$185

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Sat 2/28

3:49 pm-11:59 pm

1 stop8h 10m

San Antonio

Mon 3/2

5:08 pm-10:27 pm

2 stops29h 19m

$188

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 September, 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 September, still average around $308.

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 Saturday when prices can be found for as low as $329. 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 $487.

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 $362. 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 $417. 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 $333 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 $228 on momondo.

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

There is only 1 cabin class 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 26% 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 January 2026, prices for St. Louis to San Antonio flights are approximately 48% 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

$253

Fastest flight time

2h 20m

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 $253. The best round-trip flight deal from St. Louis to San Antonio found on momondo in the last 72 hours is $385.
The fastest flight from St. Louis to San Antonio takes 2h 20m
Direct flights go from St. Louis to San Antonio every day.
There is 1 airport in San Antonio. From St. Louis there are direct flights to 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 20m 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
7.9
8,124 reviews
Search Delta flights
FrontierPriceFrom $151Free CancellationRating
5.7
3,056 reviews
Search Frontier flights
SouthwestPriceFrom $197Free CancellationRating
8.0
4,267 reviews
Search Southwest flights
American AirlinesPriceFrom $198Free CancellationRating
7.2
11,201 reviews
Search American Airlines flights
United AirlinesPriceFrom $222Free CancellationRating
7.4
9,212 reviews
Search United 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 $197. Generally, Southwest has 5 flights on this route every week with an average price of $367. Southwest is rated 8.0/10 by our users.

  • United Airlines Flights From St. Louis to San Antonio

    United Airlines is also a popular choice for this route. United Airlines flight deals for St. Louis to San Antonio start from as low as $222 round-trip, depending on your selected dates, with average United Airlines deals seen on momondo around $282. United Airlines operates 7 flights to San Antonio from St. Louis in an average week. Users have rated it 7.4/10 across 9,212 reviews.

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
Pleasanton
Schertz

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.

An easier way to manage your San Antonio trip

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