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Cheap flights from St. Louis to San Antonio from $71

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 12/10. 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

United Airlines Logo
1:35 pm - 9:49 pmSTL-SAT
8h 14m1 stop
United Airlines Logo
4:24 pm - 10:22 pmSAT-STL
5h 58m1 stop
$151United Airlines
Find Deal
mar., nov. 11 - lun., nov. 17
American Airlines Logo
5:56 pm - 12:28 amSTL-SAT
6h 32m1 stop
American Airlines Logo
6:00 am - 12:37 pmSAT-STL
6h 37m1 stop
$159American Airlines
Find Deal
vie., nov. 14 - mar., nov. 18
Delta Logo
6:00 am - 12:10 pmSTL-SAT
6h 10m1 stop
Delta Logo
4:51 pm - 11:41 pmSAT-STL
6h 50m1 stop
$197Delta
Find Deal
lun., dic. 8 - lun., dic. 8
Frontier Logo
7:55 pm - 11:46 amSTL-SAT
15h 51m1 stop
Frontier Logo
9:55 am - 9:06 amSAT-STL
23h 11m1 stop
$201Frontier
Find Deal
jue., oct. 2 - dom., oct. 5
Frontier Logo
11:32 am - 4:52 pmSTL-SAT
5h 20m1 stop
Frontier Logo
9:52 pm - 11:43 amSAT-STL
13h 51m1 stop
$202Frontier
Find Deal
dom., oct. 12 - dom., oct. 19
United Airlines Logo
6:15 am - 1:15 pmSTL-SAT
7h 00m1 stop
United Airlines Logo
4:39 pm - 11:58 pmSAT-STL
7h 19m1 stop
$213United Airlines
Find Deal
jue., oct. 16 - mar., oct. 21
American Airlines Logo
2:08 pm - 10:44 pmSTL-SAT
8h 36m1 stop
American Airlines Logo
6:08 am - 1:43 pmSAT-STL
7h 35m1 stop
$219American Airlines
Find Deal
sáb., nov. 22 - vie., nov. 28
Delta Logo
3:30 pm - 9:10 pmSTL-SAT
5h 40m1 stop
Delta Logo
6:21 pm - 11:41 pmSAT-STL
5h 20m1 stop
$257Delta
Find Deal
mié., oct. 22 - vie., oct. 24
Southwest Logo
10:15 am - 4:05 pmSTL-SAT
5h 50m2 stops
Southwest Logo
2:10 pm - 9:00 pmSAT-STL
6h 50m1 stop
$274Southwest
Find Deal
mar., ene. 27 - vie., ene. 30
Southwest Logo
10:15 am - 12:35 pmSTL-SAT
2h 20mnonstop
Southwest Logo
5:55 am - 9:55 amSAT-STL
4h 00m1 stop
$288Southwest
Find Deal
mar., nov. 11 - dom., nov. 16

Delta flights from St. Louis to San Antonio

Our best Delta deals on St. Louis to San Antonio flight tickets
Delta
Dec 8
STL6:00 amLambert-St Louis
6h 10m
1 stop
SAT12:10 pmSan Antonio
Dec 8
SAT4:51 pmSan Antonio
6h 50m
1 stop
STL11:41 pmLambert-St Louis
$197
Find similar
Delta
Oct 22
STL3:30 pmLambert-St Louis
5h 40m
1 stop
SAT9:10 pmSan Antonio
Oct 24
SAT6:21 pmSan Antonio
5h 20m
1 stop
STL11:41 pmLambert-St Louis
$257
Find similar
Delta
Dec 1
STL7:02 pmLambert-St Louis
5h 31m
1 stop
SAT12:33 amSan Antonio
Dec 5
SAT4:51 pmSan Antonio
6h 50m
1 stop
STL11:41 pmLambert-St Louis
$258
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
Nov 11
STL1:35 pmLambert-St Louis
8h 14m
1 stop
SAT9:49 pmSan Antonio
Nov 17
SAT4:24 pmSan Antonio
5h 58m
1 stop
STL10:22 pmLambert-St Louis
$151
Find similar
United Airlines
Oct 16
STL6:15 amLambert-St Louis
7h 00m
1 stop
SAT1:15 pmSan Antonio
Oct 21
SAT4:39 pmSan Antonio
7h 19m
1 stop
STL11:58 pmLambert-St Louis
$213
Find similar
United Airlines
Nov 13
STL9:00 amLambert-St Louis
7h 58m
1 stop
SAT4:58 pmSan Antonio
Nov 16
SAT5:30 amSan Antonio
5h 09m
1 stop
STL10:39 amLambert-St Louis
$221
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 septiembre 16, 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

mar. 11/11

1:35 pm-9:49 pm

1 stop8h 14m

San Antonio

lun. 11/17

4:24 pm-10:22 pm

1 stop5h 58m

$151

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

vie. 11/14

5:56 pm-12:28 am

1 stop6h 32m

San Antonio

mar. 11/18

6:00 am-12:37 pm

1 stop6h 37m

$159

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

lun. 12/8

6:00 am-12:10 pm

1 stop6h 10m

San Antonio

lun. 12/8

4:51 pm-11:41 pm

1 stop6h 50m

$197

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

jue. 10/2

7:55 pm-11:46 am

1 stop15h 51m

San Antonio

dom. 10/5

9:55 am-9:06 am

1 stop23h 11m

$201

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

dom. 10/12

11:32 am-4:52 pm

1 stop5h 20m

San Antonio

dom. 10/19

9:52 pm-11:43 am

1 stop13h 51m

$202

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

jue. 10/16

6:15 am-1:15 pm

1 stop7h 00m

San Antonio

mar. 10/21

4:39 pm-11:58 pm

1 stop7h 19m

$213

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

sáb. 11/22

2:08 pm-10:44 pm

1 stop8h 36m

San Antonio

vie. 11/28

6:08 am-1:43 pm

1 stop7h 35m

$219

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

mié. 10/22

3:30 pm-9:10 pm

1 stop5h 40m

San Antonio

vie. 10/24

6:21 pm-11:41 pm

1 stop5h 20m

$257

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

mar. 1/27

10:15 am-4:05 pm

2 stops5h 50m

San Antonio

vie. 1/30

2:10 pm-9:00 pm

1 stop6h 50m

$274

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

mar. 11/11

10:15 am-12:35 pm

Nonstop2h 20m

San Antonio

dom. 11/16

5:55 am-9:55 am

1 stop4h 00m

$288

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 May instead. Flights to San Antonio in May, while not as cheap as those in April, still average around $307.

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 $313. 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 Wednesday as prices are generally higher than usual. According to our data, the average ticket price to San Antonio on Wednesday is $447.

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 at noon, with an average ticket price of $481. Departure times at noon 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 $328 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 $233 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 17% 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 September 2025, prices for St. Louis to San Antonio flights are approximately 26% 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

$287

Fastest flight time

2h 10m

Direct flights

Every day

Airports in San Antonio

1 airport
The best flight deal from St. Louis to San Antonio found on momondo in the last 72 hours is $287
The fastest flight from St. Louis to San Antonio takes 2h 10m
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 15m 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
7,957 reviews
Search Delta flights
FrontierPriceFrom $128Free CancellationRating
5.8
3,174 reviews
Search Frontier flights
SouthwestPriceFrom $201Free CancellationRating
8.0
4,242 reviews
Search Southwest flights
United AirlinesPriceFrom $212Free CancellationRating
7.4
8,924 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 $201. Generally, Southwest has 8 flights on this route every week with an average price of $392. 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 $212 round-trip, depending on your selected dates, with average United Airlines deals seen on momondo around $311. United Airlines operates 5 flights to San Antonio from St. Louis in an average week. Users have rated it 7.4/10 across 8,924 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
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.

An easier way to manage your San Antonio trip

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