Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from San Antonio to St. Louis from $87

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
10:29 pm - 12:33 pmSAT  San Antonio-STL Lambert-St Louis
14h 04m1 stop Las Vegas Harry Reid Intl
Frontier Logo
1:28 pm - 9:34 pmSTL  Lambert-St Louis-SAT San Antonio
8h 06m1 stop Las Vegas Harry Reid Intl
$268Frontier
Thu, Oct 29 - Mon, Nov 2
Southwest Logo
11:25 am - 3:10 pmSAT  San Antonio-STL Lambert-St Louis
3h 45m1 stop New Orleans Louis Armstrong
Southwest Logo
8:30 am - 10:40 amSTL  Lambert-St Louis-SAT San Antonio
2h 10mnonstop
$268Southwest
Wed, Oct 14 - Wed, Oct 21
Southwest Logo
7:20 am - 9:25 amSAT  San Antonio-STL Lambert-St Louis
2h 05mnonstop
Southwest Logo
8:50 pm - 11:05 pmSTL  Lambert-St Louis-SAT San Antonio
2h 15mnonstop
$269Southwest
Wed, Oct 14 - Wed, Oct 21
Southwest Logo
7:35 am - 9:35 amSAT  San Antonio-STL Lambert-St Louis
2h 00mnonstop
Southwest Logo
6:55 pm - 9:15 pmSTL  Lambert-St Louis-SAT San Antonio
2h 20mnonstop
$269Southwest
Wed, Feb 10 - Wed, Feb 17
Frontier Logo
10:29 pm - 12:33 pmSAT  San Antonio-STL Lambert-St Louis
14h 04m1 stop Las Vegas Harry Reid Intl
Frontier Logo
5:59 pm - 11:11 amSTL  Lambert-St Louis-SAT San Antonio
17h 12m1 stop Orlando
$270Frontier
Wed, Nov 18 - Sun, Nov 22
American Airlines Logo
7:10 am - 12:35 pmSAT  San Antonio-STL Lambert-St Louis
5h 25m1 stop Chicago O'Hare Intl
American Airlines Logo
5:40 am - 9:46 amSTL  Lambert-St Louis-SAT San Antonio
4h 06m1 stop Dallas/Fort Worth
$275American Airlines
Tue, Oct 13 - Tue, Oct 20
United Airlines Logo
5:58 pm - 10:30 pmSAT  San Antonio-STL Lambert-St Louis
4h 32m1 stop Houston George Bush Intcntl
United Airlines Logo
3:12 pm - 9:31 pmSTL  Lambert-St Louis-SAT San Antonio
6h 19m1 stop Houston George Bush Intcntl
$275United Airlines
Wed, Oct 7 - Sat, Oct 10
Frontier Logo
8:21 pm - 5:40 pmSAT  San Antonio-STL Lambert-St Louis
21h 19m2 stops Denver Intl Atlanta Hartsfield-Jackson
Frontier Logo
6:35 pm - 7:26 pmSTL  Lambert-St Louis-SAT San Antonio
24h 51m2 stops Atlanta Hartsfield-Jackson Denver Intl
$277Frontier
Thu, Oct 15 - Mon, Oct 19
United Airlines Logo
2:00 pm - 9:21 pmSAT  San Antonio-STL Lambert-St Louis
7h 21m1 stop Chicago O'Hare Intl
United Airlines Logo
6:15 am - 10:46 amSTL  Lambert-St Louis-SAT San Antonio
4h 31m1 stop Houston George Bush Intcntl
$289United Airlines
Sat, Oct 24 - Mon, Oct 26
American Airlines Logo
6:40 pm - 11:59 pmSAT  San Antonio-STL Lambert-St Louis
5h 19m1 stop Chicago O'Hare Intl
American Airlines Logo
7:06 pm - 12:04 amSTL  Lambert-St Louis-SAT San Antonio
4h 58m1 stop Dallas/Fort Worth
$294American Airlines
Sat, Nov 7 - Mon, Nov 9

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Frontier flights from San Antonio to St. Louis

Our best Frontier deals on San Antonio to St. Louis flight tickets
Frontier
Nov 18
SAT10:29 pmSan Antonio
14h 04m
1 stop
STL12:33 pmLambert-St Louis
Nov 22
STL5:59 pmLambert-St Louis
17h 12m
1 stop
SAT11:11 amSan Antonio
$270
Frontier
Dec 7
SAT12:00 pmSan Antonio
6h 54m
1 stop
STL6:54 pmLambert-St Louis
Dec 14
STL9:50 amLambert-St Louis
10h 22m
1 stop
SAT8:12 pmSan Antonio
$278
Frontier
Nov 5
SAT10:29 pmSan Antonio
14h 04m
1 stop
STL12:33 pmLambert-St Louis
Nov 9
STL1:28 pmLambert-St Louis
8h 06m
1 stop
SAT9:34 pmSan Antonio
$280

Southwest flights from San Antonio to St. Louis

Our best Southwest deals on San Antonio to St. Louis flight tickets
Southwest
Oct 14
SAT11:25 amSan Antonio
3h 45m
1 stop
STL3:10 pmLambert-St Louis
Oct 21
STL8:30 amLambert-St Louis
2h 10m
SAT10:40 amSan Antonio
$268
Southwest
Oct 14
SAT7:20 amSan Antonio
2h 05m
STL9:25 amLambert-St Louis
Oct 21
STL8:50 pmLambert-St Louis
2h 15m
SAT11:05 pmSan Antonio
$269
Southwest
Oct 14
SAT11:25 amSan Antonio
3h 45m
1 stop
STL3:10 pmLambert-St Louis
Oct 21
STL5:20 pmLambert-St Louis
4h 35m
1 stop
SAT9:55 pmSan Antonio
$272

momondo Fare Finder

 
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 San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Thu 10/29

10:29 pm-12:33 pm

1 stop14h 04m

Lambert-St Louis

Mon 11/2

1:28 pm-9:34 pm

1 stop8h 06m

$268

San AntonioSt. Louis

SAT San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Wed 10/14

11:25 am-3:10 pm

1 stop3h 45m

Lambert-St Louis

Wed 10/21

8:30 am-10:40 am

Nonstop2h 10m

$268
Quickest round-trip

San AntonioSt. Louis

SAT San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Wed 10/14

7:20 am-9:25 am

Nonstop2h 05m

Lambert-St Louis

Wed 10/21

8:50 pm-11:05 pm

Nonstop2h 15m

$269

San AntonioSt. Louis

SAT San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Wed 2/10

7:35 am-9:35 am

Nonstop2h 00m

Lambert-St Louis

Wed 2/17

6:55 pm-9:15 pm

Nonstop2h 20m

$269

San AntonioSt. Louis

SAT San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Wed 11/18

10:29 pm-12:33 pm

1 stop14h 04m

Lambert-St Louis

Sun 11/22

5:59 pm-11:11 am

1 stop17h 12m

$270

San AntonioSt. Louis

SAT San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Tue 10/13

7:10 am-12:35 pm

1 stop5h 25m

Lambert-St Louis

Tue 10/20

5:40 am-9:46 am

1 stop4h 06m

$275

San AntonioSt. Louis

SAT San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Wed 10/7

5:58 pm-10:30 pm

1 stop4h 32m

Lambert-St Louis

Sat 10/10

3:12 pm-9:31 pm

1 stop6h 19m

$275

San AntonioSt. Louis

SAT San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Thu 10/15

8:21 pm-5:40 pm

2 stops21h 19m

Lambert-St Louis

Mon 10/19

6:35 pm-7:26 pm

2 stops24h 51m

$277

San AntonioSt. Louis

SAT San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Sat 10/24

2:00 pm-9:21 pm

1 stop7h 21m

Lambert-St Louis

Mon 10/26

6:15 am-10:46 am

1 stop4h 31m

$289

San AntonioSt. Louis

SAT San Antonio - STL Lambert-St Louis

SATSTL

San Antonio

Sat 11/7

6:40 pm-11:59 pm

1 stop5h 19m

Lambert-St Louis

Mon 11/9

7:06 pm-12:04 am

1 stop4h 58m

$294

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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?

Prices are currently low for flights on this route.

Typical prices usually range from $389 to $770.
The lowest price recently found on this route was $268.

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 $313. The month of December is another great option to travel to St. Louis, with average flight prices from San Antonio averaging around $348.

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 $387. 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 $517. 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 $403 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 $531 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 28% 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 September 2026, prices for San Antonio to St. Louis flights are approximately 120% 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

$87

Fastest flight time

2h 00m

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 $87. The best round-trip flight deal from San Antonio to St. Louis found on momondo in the last 72 hours is $268.
The fastest flight from San Antonio to St. Louis takes 2h 00m
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 00m.

  • 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
10,214 reviews
Search United Airlines flights
American AirlinesPriceFrom $257Free CancellationRating
7.1
12,075 reviews
Search American Airlines flights
SouthwestPriceFrom $286Free CancellationRating
8.0
4,190 reviews
Search Southwest flights

  • Southwest Flights From San Antonio to St. Louis

    Southwest flies from San Antonio to St. Louis around 4 times per week, with 4,190 momondo users rating the airline 8.0/10. The cheapest Southwest deal from San Antonio to St. Louis in the last 72 hours was $286 (round-trip), much lower than the average airfare cost of $476 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
St. Peters
Maryland Heights
Alton
Collinsville
Florissant
Hermann
Clayton
O'Fallon
Farmington
Fenton
Festus
Edwardsville
Wentzville
Eureka
Litchfield
Grafton
Waterloo

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.

An easier way to manage your St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sat 10/17
Sat 10/24
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States