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Cheap flights from San Antonio to St. Louis from $77

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from San Antonio to St. Louis departing on 9/20. 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 San Antonio to St. Louis

Cheap round-trip flights

Frontier Logo
7:25 pm - 9:06 amSAT-STL
13h 41m1 stop
Frontier Logo
7:55 pm - 7:15 pmSTL-SAT
23h 20m1 stop
$143Frontier
Find Deal
Fri, Sep 26 - Sun, Sep 28
Frontier Logo
5:32 pm - 9:07 amSAT-STL
15h 35m1 stop
Frontier Logo
7:52 pm - 3:14 pmSTL-SAT
19h 22m1 stop
$177Frontier
Find Deal
Sat, Oct 11 - Tue, Oct 14
Delta Logo
10:45 am - 6:02 pmSAT-STL
7h 17m1 stop
Delta Logo
6:45 am - 3:01 pmSTL-SAT
8h 16m1 stop
$239Delta
Find Deal
Tue, Dec 2 - Tue, Dec 9
Delta Logo
10:45 am - 6:02 pmSAT-STL
7h 17m1 stop
Delta Logo
7:05 pm - 12:25 amSTL-SAT
5h 20m1 stop
$249Delta
Find Deal
Tue, Dec 2 - Fri, Dec 5
Logo
8:25 pm - 9:07 amSAT-STL
12h 42m1 stop
Logo
7:45 pm - 2:07 pmSTL-SAT
18h 22m2 stops
$252
Find Deal
Fri, Nov 7 - Mon, Nov 10
United Airlines Logo
4:14 pm - 9:58 pmSAT-STL
5h 44m1 stop
United Airlines Logo
6:15 am - 10:51 amSTL-SAT
4h 36m1 stop
$254United Airlines
Find Deal
Thu, Dec 11 - Mon, Dec 15
Logo
7:25 pm - 9:06 amSAT-STL
13h 41m1 stop
Logo
7:55 pm - 11:40 amSTL-SAT
15h 45m2 stops
$267
Find Deal
Fri, Sep 26 - Sun, Sep 28
Southwest Logo
12:30 pm - 2:40 pmSAT-STL
2h 10mnonstop
Southwest Logo
10:15 am - 12:35 pmSTL-SAT
2h 20mnonstop
$277Southwest
Find Deal
Thu, Dec 4 - Mon, Dec 8
Southwest Logo
12:30 pm - 2:40 pmSAT-STL
2h 10mnonstop
Southwest Logo
5:55 am - 11:55 amSTL-SAT
6h 00m1 stop
$287Southwest
Find Deal
Thu, Dec 4 - Mon, Dec 8
United Airlines Logo
5:20 am - 12:15 pmSAT-STL
6h 55m2 stops
United Airlines Logo
4:45 pm - 10:59 pmSTL-SAT
6h 14m1 stop
$314United Airlines
Find Deal
Sat, Dec 6 - Sat, Dec 6

American Airlines flights from San Antonio to St. Louis

Our best American Airlines deals on San Antonio to St. Louis flight tickets
American Airlines
Aug 30
SAT8:00 amSan Antonio
10h 30m
1 stop
STL6:30 pmLambert-St Louis
Sep 1
STL9:23 amLambert-St Louis
4h 48m
1 stop
SAT2:11 pmSan Antonio
$470
Find similar
American Airlines
Aug 27
SAT7:30 amSan Antonio
6h 21m
1 stop
STL1:51 pmLambert-St Louis
Aug 31
STL9:23 amLambert-St Louis
11h 10m
1 stop
SAT8:33 pmSan Antonio
$482
Find similar
American Airlines
Aug 27
SAT7:30 amSan Antonio
6h 21m
1 stop
STL1:51 pmLambert-St Louis
Aug 31
STL9:23 amLambert-St Louis
6h 08m
1 stop
SAT3:31 pmSan Antonio
$501
Find similar

Southwest flights from San Antonio to St. Louis

Our best Southwest deals on San Antonio to St. Louis flight tickets
Southwest
Dec 4
SAT12:30 pmSan Antonio
2h 10m
STL2:40 pmLambert-St Louis
Dec 8
STL10:15 amLambert-St Louis
2h 20m
SAT12:35 pmSan Antonio
$277
Find similar
Southwest
Dec 4
SAT12:30 pmSan Antonio
2h 10m
STL2:40 pmLambert-St Louis
Dec 8
STL5:55 amLambert-St Louis
6h 00m
1 stop
SAT11:55 amSan Antonio
$287
Find similar
Southwest
Dec 4
SAT2:35 pmSan Antonio
5h 10m
1 stop
STL7:45 pmLambert-St Louis
Dec 8
STL10:15 amLambert-St Louis
7h 35m
2 stops
SAT5:50 pmSan Antonio
$302
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from San Antonio to St. Louis 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 August 18, 2025.
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

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Fri 9/26

7:25 pm-9:06 am

1 stop13h 41m

Lambert-St Louis

Sun 9/28

7:55 pm-7:15 pm

1 stop23h 20m

$143

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Sat 10/11

5:32 pm-9:07 am

1 stop15h 35m

Lambert-St Louis

Tue 10/14

7:52 pm-3:14 pm

1 stop19h 22m

$177

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 12/2

10:45 am-6:02 pm

1 stop7h 17m

Lambert-St Louis

Tue 12/9

6:45 am-3:01 pm

1 stop8h 16m

$239

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 12/2

10:45 am-6:02 pm

1 stop7h 17m

Lambert-St Louis

Fri 12/5

7:05 pm-12:25 am

1 stop5h 20m

$249

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Fri 11/7

8:25 pm-9:07 am

1 stop12h 42m

Lambert-St Louis

Mon 11/10

7:45 pm-2:07 pm

2 stops18h 22m

$252

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 12/11

4:14 pm-9:58 pm

1 stop5h 44m

Lambert-St Louis

Mon 12/15

6:15 am-10:51 am

1 stop4h 36m

$254

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Fri 9/26

7:25 pm-9:06 am

1 stop13h 41m

Lambert-St Louis

Sun 9/28

7:55 pm-11:40 am

2 stops15h 45m

$267

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 12/4

12:30 pm-2:40 pm

Nonstop2h 10m

Lambert-St Louis

Mon 12/8

10:15 am-12:35 pm

Nonstop2h 20m

$277

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 12/4

12:30 pm-2:40 pm

Nonstop2h 10m

Lambert-St Louis

Mon 12/8

5:55 am-11:55 am

1 stop6h 00m

$287

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Sat 12/6

5:20 am-12:15 pm

2 stops6h 55m

Lambert-St Louis

Sat 12/6

4:45 pm-10:59 pm

1 stop6h 14m

$314

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 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 $298. The month of August is another great option to travel to St. Louis, with average flight prices from San Antonio averaging around $298.

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 Wednesday 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 Monday because tickets tend to average around $474. 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 evening is the least expensive time of day to depart. momondo users have found prices as low as $201 when looking at flights departing in the evening. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $557 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

How far in advance should I book a flight to St. Louis?

You are more likely to see cheaper flights to St. Louis from San Antonio when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $338 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from San Antonio for as low as $196 on momondo.

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

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

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

As of August 2025, prices for San Antonio to St. Louis flights are approximately 26% 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

  • 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 10m.

  • 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
FrontierPriceFrom $128Free CancellationRating
5.8
3,212 reviews
Search Frontier flights
DeltaPriceFrom $165Free CancellationRating
8.0
7,981 reviews
Search Delta flights
United AirlinesPriceFrom $193Free CancellationRating
7.4
8,925 reviews
Search United Airlines flights
American AirlinesPriceFrom $216Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $227Free CancellationRating
8.0
4,246 reviews
Search Southwest flights

  • Southwest Flights From San Antonio to St. Louis

    Southwest flies from San Antonio to St. Louis around 12 times per week, with 4,246 momondo users rating the airline 8.0/10. The cheapest Southwest deal from San Antonio to St. Louis in the last 72 hours was $227 (round-trip), much lower than the average airfare cost of $412 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
Hermann
Maryland Heights
Florissant
O'Fallon
Fenton
Wentzville
Collinsville
Alton
St. Peters
Farmington
Festus
Glencoe
Eureka
Clayton
Edwardsville
Litchfield
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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