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Cheap flights from San Antonio to St. Louis from $109

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 6/13. 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 San Antonio to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:56 pm - 2:06 pm
SAT
-
STL
17h 10m
1 stop
Frontier Logo
2:56 pm - 8:11 pm
STL
-
SAT
29h 15m
1 stop
$227Frontier
Thu, Jun 11 - Mon, Jun 15
Frontier Logo
8:56 pm - 2:06 pm
SAT
-
STL
17h 10m
1 stop
Frontier Logo
7:38 pm - 6:56 pm
STL
-
SAT
23h 18m
1 stop
$235Frontier
Thu, Jun 11 - Sat, Jun 13
Frontier Logo
8:59 pm - 2:07 pm
SAT
-
STL
17h 08m
1 stop
Frontier Logo
2:52 pm - 8:14 pm
STL
-
SAT
29h 22m
1 stop
$240Frontier
Thu, Jul 9 - Mon, Jul 13
Frontier Logo
8:56 pm - 2:06 pm
SAT
-
STL
17h 10m
1 stop
Frontier Logo
8:08 pm - 6:54 pm
STL
-
SAT
22h 46m
1 stop
$249Frontier
Thu, Jul 2 - Mon, Jul 6
Frontier Logo
8:56 pm - 6:08 pm
SAT
-
STL
21h 12m
1 stop
Frontier Logo
8:08 pm - 6:56 pm
STL
-
SAT
22h 48m
1 stop
$256Frontier
Tue, Jun 9 - Tue, Jun 30
Frontier Logo
8:59 pm - 2:07 pm
SAT
-
STL
17h 08m
1 stop
Frontier Logo
8:08 pm - 6:54 pm
STL
-
SAT
22h 46m
1 stop
$261Frontier
Thu, Jul 30 - Sat, Aug 1
Frontier Logo
7:51 pm - 7:23 pm
SAT
-
STL
23h 32m
1 stop
Frontier Logo
8:08 pm - 6:56 pm
STL
-
SAT
22h 48m
1 stop
$267Frontier
Tue, Jun 16 - Tue, Jun 23
Frontier Logo
8:59 pm - 5:34 pm
SAT
-
STL
20h 35m
1 stop
Frontier Logo
8:08 pm - 6:56 pm
STL
-
SAT
22h 48m
1 stop
$268Frontier
Fri, Jun 5 - Mon, Jun 8
Frontier Logo
8:56 pm - 6:51 pm
SAT
-
STL
21h 55m
1 stop
Frontier Logo
7:38 pm - 6:54 pm
STL
-
SAT
23h 16m
1 stop
$270Frontier
Tue, Jun 30 - Sat, Jul 4
Frontier Logo
8:56 pm - 2:06 pm
SAT
-
STL
17h 10m
1 stop
Frontier Logo
2:56 pm - 8:11 pm
STL
-
SAT
29h 15m
1 stop
$274Frontier
Thu, Jun 11 - Mon, Jun 15

Delta flights from San Antonio to St. Louis

Our best Delta deals on San Antonio to St. Louis flight tickets
Delta
Aug 20
SAT5:20 amSan Antonio
6h 26m
1 stop
STL11:46 amLambert-St Louis
Aug 25
STL12:52 pmLambert-St Louis
5h 18m
1 stop
SAT6:10 pmSan Antonio
$339
Delta
Jun 9
SAT5:00 pmSan Antonio
6h 56m
1 stop
STL11:56 pmLambert-St Louis
Jun 23
STL7:12 pmLambert-St Louis
5h 21m
1 stop
SAT12:33 amSan Antonio
$402
Delta
May 22
SAT10:52 amSan Antonio
7h 04m
1 stop
STL5:56 pmLambert-St Louis
May 26
STL10:49 amLambert-St Louis
7h 34m
1 stop
SAT6:23 pmSan Antonio
$595

Frontier flights from San Antonio to St. Louis

Our best Frontier deals on San Antonio to St. Louis flight tickets
Frontier
Jun 11
SAT8:56 pmSan Antonio
17h 10m
1 stop
STL2:06 pmLambert-St Louis
Jun 15
STL2:56 pmLambert-St Louis
29h 15m
1 stop
SAT8:11 pmSan Antonio
$227
Frontier
Jun 11
SAT8:56 pmSan Antonio
17h 10m
1 stop
STL2:06 pmLambert-St Louis
Jun 13
STL7:38 pmLambert-St Louis
23h 18m
1 stop
SAT6:56 pmSan Antonio
$235
Frontier
Jul 9
SAT8:59 pmSan Antonio
17h 08m
1 stop
STL2:07 pmLambert-St Louis
Jul 13
STL2:52 pmLambert-St Louis
29h 22m
1 stop
SAT8:14 pmSan Antonio
$240

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 May 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 6/11

8:56 pm-2:06 pm

1 stop17h 10m

Lambert-St Louis

Mon 6/15

2:56 pm-8:11 pm

1 stop29h 15m

$227

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 6/11

8:56 pm-2:06 pm

1 stop17h 10m

Lambert-St Louis

Sat 6/13

7:38 pm-6:56 pm

1 stop23h 18m

$235

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 7/9

8:59 pm-2:07 pm

1 stop17h 08m

Lambert-St Louis

Mon 7/13

2:52 pm-8:14 pm

1 stop29h 22m

$240

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 7/2

8:56 pm-2:06 pm

1 stop17h 10m

Lambert-St Louis

Mon 7/6

8:08 pm-6:54 pm

1 stop22h 46m

$249

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 6/9

8:56 pm-6:08 pm

1 stop21h 12m

Lambert-St Louis

Tue 6/30

8:08 pm-6:56 pm

1 stop22h 48m

$256
Quickest round-trip

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 7/30

8:59 pm-2:07 pm

1 stop17h 08m

Lambert-St Louis

Sat 8/1

8:08 pm-6:54 pm

1 stop22h 46m

$261

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 6/16

7:51 pm-7:23 pm

1 stop23h 32m

Lambert-St Louis

Tue 6/23

8:08 pm-6:56 pm

1 stop22h 48m

$267

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Fri 6/5

8:59 pm-5:34 pm

1 stop20h 35m

Lambert-St Louis

Mon 6/8

8:08 pm-6:56 pm

1 stop22h 48m

$268

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 6/30

8:56 pm-6:51 pm

1 stop21h 55m

Lambert-St Louis

Sat 7/4

7:38 pm-6:54 pm

1 stop23h 16m

$270

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 6/11

8:56 pm-2:06 pm

1 stop17h 10m

Lambert-St Louis

Mon 6/15

2:56 pm-8:11 pm

1 stop29h 15m

$274

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 $584. 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 $351 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?

No. A direct flight is the cheapest option for a flight between San Antonio to St. Louis.

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

As of May 2026, prices for San Antonio to St. Louis flights are approximately 69% 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

$232

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 $232. The best round-trip flight deal from San Antonio to St. Louis found on momondo in the last 72 hours is $387.
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 $192Free CancellationRating
7.4
9,736 reviews
Search United Airlines flights
American AirlinesPriceFrom $207Free CancellationRating
7.1
11,642 reviews
Search American Airlines flights
DeltaPriceFrom $232Free CancellationRating
7.9
8,454 reviews
Search Delta flights
SouthwestPriceFrom $266Free CancellationRating
7.9
4,285 reviews
Search Southwest flights

  • Southwest Flights From San Antonio to St. Louis

    Southwest flies from San Antonio to St. Louis around 10 times per week, with 4,285 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 $436 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
Maryland Heights
Florissant
O'Fallon
St. Peters
Collinsville
Alton
Wentzville
Fenton
Farmington
Festus
Eureka
Clayton
Litchfield
Edwardsville
Shrewsbury
Grafton

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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