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Cheap flights from San Antonio to St. Louis from $120

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 8/15. 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
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from San Antonio to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
9:32 pm - 6:15 pm
SAT
-
STL
20h 43m
1 stop
Frontier Logo
7:10 pm - 8:37 pm
STL
-
SAT
25h 27m
1 stop
$245Frontier
Thu, Aug 6 - Mon, Aug 10
Frontier Logo
9:32 pm - 6:15 pm
SAT
-
STL
20h 43m
1 stop
Frontier Logo
7:10 pm - 8:37 pm
STL
-
SAT
25h 27m
1 stop
$254Frontier
Thu, Aug 6 - Mon, Aug 10
Frontier Logo
7:39 pm - 7:23 pm
SAT
-
STL
23h 44m
1 stop
Frontier Logo
7:03 pm - 8:37 pm
STL
-
SAT
25h 34m
1 stop
$264Frontier
Wed, Jul 22 - Wed, Jul 29
Frontier Logo
9:32 pm - 6:15 pm
SAT
-
STL
20h 43m
1 stop
Frontier Logo
8:08 pm - 6:44 pm
STL
-
SAT
22h 36m
1 stop
$266Frontier
Wed, Jul 15 - Mon, Jul 20
Frontier Logo
4:26 pm - 11:59 pm
SAT
-
STL
7h 33m
1 stop
Frontier Logo
8:08 pm - 6:44 pm
STL
-
SAT
22h 36m
1 stop
$268Frontier
Sat, Jul 11 - Sat, Jul 25
Frontier Logo
7:39 pm - 7:23 pm
SAT
-
STL
23h 44m
1 stop
Frontier Logo
7:10 pm - 8:37 pm
STL
-
SAT
25h 27m
1 stop
$273Frontier
Tue, Jul 21 - Thu, Jul 23
Frontier Logo
10:34 pm - 11:51 am
SAT
-
STL
13h 17m
1 stop
Frontier Logo
8:10 pm - 10:12 am
STL
-
SAT
14h 02m
1 stop
$274Frontier
Mon, Sep 14 - Thu, Sep 17
Frontier Logo
9:32 pm - 6:15 pm
SAT
-
STL
20h 43m
1 stop
Frontier Logo
8:08 pm - 6:44 pm
STL
-
SAT
22h 36m
1 stop
$275Frontier
Wed, Jul 15 - Mon, Jul 20
Frontier Logo
7:39 pm - 7:23 pm
SAT
-
STL
23h 44m
1 stop
Frontier Logo
8:08 pm - 6:44 pm
STL
-
SAT
22h 36m
1 stop
$276Frontier
Tue, Jul 14 - Tue, Jul 21
Frontier Logo
10:41 pm - 1:17 am
SAT
-
STL
26h 36m
1 stop
Frontier Logo
8:10 pm - 11:21 am
STL
-
SAT
15h 11m
1 stop
$277Frontier
Thu, Oct 15 - Mon, Oct 19

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United Airlines flights from San Antonio to St. Louis

Our best United Airlines deals on San Antonio to St. Louis flight tickets
United Airlines
Oct 15
SAT9:48 amSan Antonio
4h 22m
1 stop
STL2:10 pmLambert-St Louis
Oct 19
STL3:12 pmLambert-St Louis
4h 08m
1 stop
SAT7:20 pmSan Antonio
$333
United Airlines
Aug 26
SAT5:30 amSan Antonio
4h 40m
1 stop
STL10:10 amLambert-St Louis
Aug 29
STL12:59 pmLambert-St Louis
8h 17m
2 stops
SAT9:16 pmSan Antonio
$338
United Airlines
Aug 11
SAT9:10 amSan Antonio
7h 24m
1 stop
STL4:34 pmLambert-St Louis
Aug 12
STL5:10 amLambert-St Louis
7h 33m
1 stop
SAT12:43 pmSan Antonio
$385

Southwest flights from San Antonio to St. Louis

Our best Southwest deals on San Antonio to St. Louis flight tickets
Southwest
Jul 8
SAT3:35 pmSan Antonio
2h 10m
STL5:45 pmLambert-St Louis
Jul 14
STL9:20 pmLambert-St Louis
2h 10m
SAT11:30 pmSan Antonio
$353
Southwest
Jul 8
SAT6:25 pmSan Antonio
3h 40m
1 stop
STL10:05 pmLambert-St Louis
Jul 14
STL8:25 amLambert-St Louis
2h 10m
SAT10:35 amSan Antonio
$359
Southwest
Aug 6
SAT7:20 amSan Antonio
2h 05m
STL9:25 amLambert-St Louis
Aug 10
STL8:30 amLambert-St Louis
2h 05m
SAT10:35 amSan Antonio
$373

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 June 20, 2026.
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

Cheapest round-trip

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 8/6

9:32 pm-6:15 pm

1 stop20h 43m

Lambert-St Louis

Mon 8/10

7:10 pm-8:37 pm

1 stop25h 27m

$245

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 8/6

9:32 pm-6:15 pm

1 stop20h 43m

Lambert-St Louis

Mon 8/10

7:10 pm-8:37 pm

1 stop25h 27m

$254

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Wed 7/22

7:39 pm-7:23 pm

1 stop23h 44m

Lambert-St Louis

Wed 7/29

7:03 pm-8:37 pm

1 stop25h 34m

$264

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Wed 7/15

9:32 pm-6:15 pm

1 stop20h 43m

Lambert-St Louis

Mon 7/20

8:08 pm-6:44 pm

1 stop22h 36m

$266

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Sat 7/11

4:26 pm-11:59 pm

1 stop7h 33m

Lambert-St Louis

Sat 7/25

8:08 pm-6:44 pm

1 stop22h 36m

$268

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 7/21

7:39 pm-7:23 pm

1 stop23h 44m

Lambert-St Louis

Thu 7/23

7:10 pm-8:37 pm

1 stop25h 27m

$273
Quickest round-trip

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Mon 9/14

10:34 pm-11:51 am

1 stop13h 17m

Lambert-St Louis

Thu 9/17

8:10 pm-10:12 am

1 stop14h 02m

$274

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Wed 7/15

9:32 pm-6:15 pm

1 stop20h 43m

Lambert-St Louis

Mon 7/20

8:08 pm-6:44 pm

1 stop22h 36m

$275

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 7/14

7:39 pm-7:23 pm

1 stop23h 44m

Lambert-St Louis

Tue 7/21

8:08 pm-6:44 pm

1 stop22h 36m

$276

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 10/15

10:41 pm-1:17 am

1 stop26h 36m

Lambert-St Louis

Mon 10/19

8:10 pm-11:21 am

1 stop15h 11m

$277

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 $313.

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 $368. 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 $557. 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 afternoon is the least expensive time of day to depart. momondo users have found prices as low as $358 when looking at flights departing in the afternoon. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $527 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

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

There is only 1 cabin class available to choose from on San Antonio to St. Louis 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 San Antonio to St. Louis flights?

You could potentially save up to 37% on your flight if you consider stops on a San Antonio to St. Louis flight.

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

As of June 2026, prices for San Antonio to St. Louis flights are approximately 22% 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

$213

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 $213. The best round-trip flight deal from San Antonio to St. Louis found on momondo in the last 72 hours is $355.
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 in St. Louis. From San Antonio there are direct flights to Lambert-St Louis (STL).
Search flight deals

Frequently asked questions about flying from San Antonio to St. Louis

  • 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
United AirlinesPriceFrom $196Free CancellationRating
7.4
9,865 reviews
Search United Airlines flights
American AirlinesPriceFrom $226Free CancellationRating
7.1
11,715 reviews
Search American Airlines flights
DeltaPriceFrom $232Free CancellationRating
7.8
8,420 reviews
Search Delta flights
SouthwestPriceFrom $266Free CancellationRating
7.9
4,241 reviews
Search Southwest flights

  • Southwest Flights From San Antonio to St. Louis

    Southwest flies from San Antonio to St. Louis around 7 times per week, with 4,241 momondo users rating the airline 7.9/10. The cheapest Southwest deal from San Antonio to St. Louis in the last 72 hours was $266 (round-trip), much lower than the average airfare cost of $457 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
St. Peters
Collinsville
Alton
Wentzville
Clayton
Fenton
Farmington
Festus
Eureka
Litchfield
Edwardsville
Grafton
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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