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Cheap flights from San Antonio to St. Louis from $55

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 2/14. 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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Cheap round-trip flights

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Frontier Logo
7:14 pm - 7:50 amSAT-STL
12h 36m1 stop
Frontier Logo
9:35 am - 6:18 pmSTL-SAT
8h 43m1 stop
$124Frontier
Find Deal
Thu, Jan 8 - Sun, Jan 11
Frontier Logo
10:13 am - 10:02 amSAT-STL
23h 49m1 stop
Frontier Logo
9:35 am - 6:18 pmSTL-SAT
8h 43m1 stop
$132Frontier
Find Deal
Thu, Jan 8 - Sun, Jan 11
Frontier Logo
10:13 am - 10:02 amSAT-STL
23h 49m1 stop
Frontier Logo
9:35 am - 6:18 pmSTL-SAT
8h 43m1 stop
$135Frontier
Find Deal
Thu, Jan 8 - Sun, Jan 11
Frontier Logo
7:14 pm - 7:50 amSAT-STL
12h 36m1 stop
Frontier Logo
9:35 am - 6:18 pmSTL-SAT
8h 43m1 stop
$138Frontier
Find Deal
Thu, Jan 8 - Sun, Jan 11
Frontier Logo
8:24 pm - 2:46 pmSAT-STL
18h 22m1 stop
Frontier Logo
1:40 pm - 7:33 pmSTL-SAT
5h 53m1 stop
$142Frontier
Find Deal
Fri, Jan 23 - Mon, Jan 26
Frontier Logo
10:13 am - 10:02 amSAT-STL
23h 49m1 stop
Frontier Logo
5:11 pm - 7:03 pmSTL-SAT
25h 52m1 stop
$158Frontier
Find Deal
Thu, Jan 8 - Sun, Jan 11
Frontier Logo
5:03 pm - 10:02 amSAT-STL
16h 59m2 stops
Frontier Logo
9:35 am - 6:18 pmSTL-SAT
8h 43m1 stop
$159Frontier
Find Deal
Thu, Jan 8 - Sun, Jan 11
Frontier Logo
10:13 am - 10:02 amSAT-STL
23h 49m1 stop
Frontier Logo
9:35 am - 6:18 pmSTL-SAT
8h 43m1 stop
$170Frontier
Find Deal
Thu, Jan 8 - Sun, Jan 11
Frontier Logo
7:56 pm - 10:14 amSAT-STL
14h 18m1 stop
Frontier Logo
10:42 am - 4:51 pmSTL-SAT
6h 09m1 stop
$171Frontier
Find Deal
Thu, Dec 11 - Sun, Dec 14
Frontier Logo
7:55 pm - 10:14 amSAT-STL
14h 19m1 stop
Frontier Logo
10:42 am - 4:51 pmSTL-SAT
6h 09m1 stop
$176Frontier
Find Deal
Fri, Dec 12 - Sun, Dec 14

Frontier flights from San Antonio to St. Louis

Our best Frontier deals on San Antonio to St. Louis flight tickets
Frontier
Jan 8
SAT7:14 pmSan Antonio
12h 36m
1 stop
STL7:50 amLambert-St Louis
Jan 11
STL9:35 amLambert-St Louis
8h 43m
1 stop
SAT6:18 pmSan Antonio
$124
Find similar
Frontier
Jan 8
SAT10:13 amSan Antonio
23h 49m
1 stop
STL10:02 amLambert-St Louis
Jan 11
STL9:35 amLambert-St Louis
8h 43m
1 stop
SAT6:18 pmSan Antonio
$132
Find similar
Frontier
Jan 8
SAT10:13 amSan Antonio
23h 49m
1 stop
STL10:02 amLambert-St Louis
Jan 11
STL9:35 amLambert-St Louis
8h 43m
1 stop
SAT6:18 pmSan Antonio
$135
Find similar

Delta flights from San Antonio to St. Louis

Our best Delta deals on San Antonio to St. Louis flight tickets
Delta
Dec 17
SAT6:25 amSan Antonio
5h 39m
1 stop
STL12:04 pmLambert-St Louis
Dec 24
STL3:43 pmLambert-St Louis
6h 10m
1 stop
SAT9:53 pmSan Antonio
$259
Find similar
Delta
Dec 4
SAT1:06 pmSan Antonio
7h 56m
1 stop
STL9:02 pmLambert-St Louis
Dec 8
STL7:02 pmLambert-St Louis
5h 32m
1 stop
SAT12:34 amSan Antonio
$529
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 November 20, 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

Thu 1/8

7:14 pm-7:50 am

1 stop12h 36m

Lambert-St Louis

Sun 1/11

9:35 am-6:18 pm

1 stop8h 43m

$124

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 1/8

10:13 am-10:02 am

1 stop23h 49m

Lambert-St Louis

Sun 1/11

9:35 am-6:18 pm

1 stop8h 43m

$132

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 1/8

10:13 am-10:02 am

1 stop23h 49m

Lambert-St Louis

Sun 1/11

9:35 am-6:18 pm

1 stop8h 43m

$135

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 1/8

7:14 pm-7:50 am

1 stop12h 36m

Lambert-St Louis

Sun 1/11

9:35 am-6:18 pm

1 stop8h 43m

$138

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Fri 1/23

8:24 pm-2:46 pm

1 stop18h 22m

Lambert-St Louis

Mon 1/26

1:40 pm-7:33 pm

1 stop5h 53m

$142

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 1/8

10:13 am-10:02 am

1 stop23h 49m

Lambert-St Louis

Sun 1/11

5:11 pm-7:03 pm

1 stop25h 52m

$158

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 1/8

5:03 pm-10:02 am

2 stops16h 59m

Lambert-St Louis

Sun 1/11

9:35 am-6:18 pm

1 stop8h 43m

$159

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 1/8

10:13 am-10:02 am

1 stop23h 49m

Lambert-St Louis

Sun 1/11

9:35 am-6:18 pm

1 stop8h 43m

$170

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 12/11

7:56 pm-10:14 am

1 stop14h 18m

Lambert-St Louis

Sun 12/14

10:42 am-4:51 pm

1 stop6h 09m

$171

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Fri 12/12

7:55 pm-10:14 am

1 stop14h 19m

Lambert-St Louis

Sun 12/14

10:42 am-4:51 pm

1 stop6h 09m

$176

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?

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

In general, August 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 $236. The month of February 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 Thursday when prices can be found for as low as $376. 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 $457. 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 $448 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 $350 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 is only 1 cabin class 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 November 2025, prices for San Antonio to St. Louis flights are approximately 44% 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

$193

Fastest flight time

2h 05m

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 $193. The best round-trip flight deal from San Antonio to St. Louis found on momondo in the last 72 hours is $368.
The fastest flight from San Antonio to St. Louis takes 2h 05m
Direct flights go from San Antonio to St. Louis every day.
There is 1 airport near St. Louis: Lambert-St Louis (STL)
Search flight deals

  • 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 05m.

  • 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 $119Free CancellationRating
5.8
3,104 reviews
Search Frontier flights
DeltaPriceFrom $196Free CancellationRating
7.9
8,002 reviews
Search Delta flights
American AirlinesPriceFrom $198Free CancellationRating
7.2
11,047 reviews
Search American Airlines flights
SouthwestPriceFrom $227Free CancellationRating
8.0
4,251 reviews
Search Southwest flights
United AirlinesPriceFrom $248Free CancellationRating
7.4
9,028 reviews
Search United Airlines flights

  • Southwest Flights From San Antonio to St. Louis

    Southwest flies from San Antonio to St. Louis around 2 times per week, with 4,251 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 $397 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
Hermann
Fairview Heights
Florissant
Maryland Heights
O'Fallon
Wentzville
Fenton
Collinsville
St. Peters
Alton
Farmington
Festus
Glencoe
Edwardsville
Clayton
Eureka
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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