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Cheap flights from San Antonio to St. Louis from $76

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 10/11. 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
8:20 pm - 9:06 amSAT-STL
12h 46m1 stop
Frontier Logo
7:55 pm - 7:15 pmSTL-SAT
23h 20m1 stop
$143Frontier
Find Deal
lun., sep. 29 - mié., oct. 1
American Airlines Logo
6:24 pm - 11:54 pmSAT-STL
5h 30m1 stop
American Airlines Logo
6:00 am - 12:52 pmSTL-SAT
6h 52m1 stop
$159American Airlines
Find Deal
mar., oct. 14 - mié., oct. 22
Frontier Logo
12:09 pm - 9:07 amSAT-STL
20h 58m1 stop
Frontier Logo
7:52 pm - 3:14 pmSTL-SAT
19h 22m1 stop
$167Frontier
Find Deal
jue., oct. 16 - lun., oct. 20
Frontier Logo
7:25 pm - 9:06 amSAT-STL
13h 41m1 stop
Frontier Logo
7:55 pm - 7:15 pmSTL-SAT
23h 20m1 stop
$168Frontier
Find Deal
vie., oct. 3 - dom., oct. 5
United Airlines Logo
6:45 am - 2:27 pmSAT-STL
7h 42m1 stop
United Airlines Logo
6:15 am - 1:15 pmSTL-SAT
7h 00m1 stop
$213United Airlines
Find Deal
mar., oct. 14 - jue., oct. 16
Multiple Airlines Logo
10:54 am - 10:14 pmSAT-STL
11h 20m1 stop
Multiple Airlines Logo
10:57 am - 6:30 pmSTL-SAT
7h 33m1 stop
$220Multiple Airlines
Find Deal
vie., oct. 17 - dom., oct. 19
Multiple Airlines Logo
12:09 pm - 9:07 amSAT-STL
20h 58m1 stop
Multiple Airlines Logo
7:52 pm - 11:40 pmSTL-SAT
27h 48m2 stops
$232Multiple Airlines
Find Deal
jue., oct. 16 - lun., oct. 20
Southwest Logo
5:20 am - 10:40 amSAT-STL
5h 20m1 stop
Southwest Logo
5:45 am - 9:55 amSTL-SAT
4h 10m1 stop
$259Southwest
Find Deal
mié., nov. 26 - mar., dic. 2
United Airlines Logo
5:30 am - 9:52 amSAT-STL
4h 22m1 stop
United Airlines Logo
6:15 am - 10:49 amSTL-SAT
4h 34m1 stop
$269United Airlines
Find Deal
mar., oct. 14 - jue., oct. 16
Southwest Logo
10:30 am - 4:25 pmSAT-STL
5h 55m1 stop
Southwest Logo
10:15 pm - 12:30 amSTL-SAT
2h 15mnonstop
$295Southwest
Find Deal
mar., oct. 14 - jue., oct. 16

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 14
SAT6:45 amSan Antonio
7h 42m
1 stop
STL2:27 pmLambert-St Louis
Oct 16
STL6:15 amLambert-St Louis
7h 00m
1 stop
SAT1:15 pmSan Antonio
$213
Find similar
United Airlines
Oct 14
SAT5:30 amSan Antonio
4h 22m
1 stop
STL9:52 amLambert-St Louis
Oct 16
STL6:15 amLambert-St Louis
4h 34m
1 stop
SAT10:49 amSan Antonio
$269
Find similar
United Airlines
Oct 24
SAT2:25 pmSan Antonio
4h 32m
1 stop
STL6:57 pmLambert-St Louis
Oct 27
STL5:24 pmLambert-St Louis
5h 52m
1 stop
SAT11:16 pmSan Antonio
$279
Find similar

Southwest flights from San Antonio to St. Louis

Our best Southwest deals on San Antonio to St. Louis flight tickets
Southwest
Nov 26
SAT5:20 amSan Antonio
5h 20m
1 stop
STL10:40 amLambert-St Louis
Dec 2
STL5:45 amLambert-St Louis
4h 10m
1 stop
SAT9:55 amSan Antonio
$259
Find similar
Southwest
Oct 14
SAT10:30 amSan Antonio
5h 55m
1 stop
STL4:25 pmLambert-St Louis
Oct 16
STL10:15 pmLambert-St Louis
2h 15m
SAT12:30 amSan Antonio
$295
Find similar
Southwest
Oct 16
SAT5:00 amSan Antonio
2h 05m
STL7:05 amLambert-St Louis
Oct 20
STL6:45 pmLambert-St Louis
5h 25m
1 stop
SAT12:10 amSan Antonio
$305
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 septiembre 17, 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

lun. 9/29

8:20 pm-9:06 am

1 stop12h 46m

Lambert-St Louis

mié. 10/1

7:55 pm-7:15 pm

1 stop23h 20m

$143

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

mar. 10/14

6:24 pm-11:54 pm

1 stop5h 30m

Lambert-St Louis

mié. 10/22

6:00 am-12:52 pm

1 stop6h 52m

$159

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

jue. 10/16

12:09 pm-9:07 am

1 stop20h 58m

Lambert-St Louis

lun. 10/20

7:52 pm-3:14 pm

1 stop19h 22m

$167

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

vie. 10/3

7:25 pm-9:06 am

1 stop13h 41m

Lambert-St Louis

dom. 10/5

7:55 pm-7:15 pm

1 stop23h 20m

$168

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

mar. 10/14

6:45 am-2:27 pm

1 stop7h 42m

Lambert-St Louis

jue. 10/16

6:15 am-1:15 pm

1 stop7h 00m

$213

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

vie. 10/17

10:54 am-10:14 pm

1 stop11h 20m

Lambert-St Louis

dom. 10/19

10:57 am-6:30 pm

1 stop7h 33m

$220

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

jue. 10/16

12:09 pm-9:07 am

1 stop20h 58m

Lambert-St Louis

lun. 10/20

7:52 pm-11:40 pm

2 stops27h 48m

$232

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

mié. 11/26

5:20 am-10:40 am

1 stop5h 20m

Lambert-St Louis

mar. 12/2

5:45 am-9:55 am

1 stop4h 10m

$259

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

mar. 10/14

5:30 am-9:52 am

1 stop4h 22m

Lambert-St Louis

jue. 10/16

6:15 am-10:49 am

1 stop4h 34m

$269

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

mar. 10/14

10:30 am-4:25 pm

1 stop5h 55m

Lambert-St Louis

jue. 10/16

10:15 pm-12:30 am

Nonstop2h 15m

$295

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, 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 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 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 $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 $344 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 September 2025, prices for San Antonio to St. Louis flights are approximately 40% 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

$208

Fastest flight time

2h 05m

Direct flights

Mon, Tue, Wed, Fri, Sat and Sun

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from San Antonio in the past 72 hours is $208. The best round-trip flight deal from San Antonio to St. Louis found on momondo in the last 72 hours is $296.
The fastest flight from San Antonio to St. Louis takes 2h 05m
Direct flights go from San Antonio to St. Louis on Monday, Tuesday, Wednesday, Friday, Saturday and Sunday. There are no airlines offering direct flights.
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
3,173 reviews
Search Frontier flights
DeltaPriceFrom $124Free CancellationRating
7.9
7,961 reviews
Search Delta flights
American AirlinesPriceFrom $216Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $227Free CancellationRating
8.0
4,242 reviews
Search Southwest flights
United AirlinesPriceFrom $248Free CancellationRating
7.4
8,926 reviews
Search United Airlines flights

  • Southwest Flights From San Antonio to St. Louis

    Southwest flies from San Antonio to St. Louis around 11 times per week, with 4,242 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 $410 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
Fenton
Collinsville
Wentzville
Alton
St. Peters
Farmington
Festus
Glencoe
Clayton
Edwardsville
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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