Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

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 11/20. 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

Discover deals from 900+ travel sites with momondo.

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

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
2:08 pm - 9:09 pmSAT-STL
7h 01m1 stop
Frontier Logo
10:24 am - 6:44 pmSTL-SAT
8h 20m1 stop
$127Frontier
Find Deal
Thu, Nov 20 - Sun, Nov 23
Frontier Logo
2:08 pm - 9:09 pmSAT-STL
7h 01m1 stop
Frontier Logo
7:43 pm - 9:30 amSTL-SAT
13h 47m1 stop
$138Frontier
Find Deal
Thu, Nov 27 - Sat, Dec 6
American Airlines Logo
11:53 am - 7:30 pmSAT-STL
7h 37m1 stop
American Airlines Logo
5:30 pm - 10:16 pmSTL-SAT
4h 46m1 stop
$179American Airlines
Find Deal
Thu, Dec 4 - Mon, Dec 8
American Airlines Logo
7:00 am - 11:03 amSAT-STL
4h 03m1 stop
American Airlines Logo
3:37 pm - 10:58 pmSTL-SAT
7h 21m1 stop
$242American Airlines
Find Deal
Wed, Jan 14 - Sun, Jan 18
United Airlines Logo
7:30 am - 2:18 pmSAT-STL
6h 48m2 stops
United Airlines Logo
6:15 am - 10:48 amSTL-SAT
4h 33m1 stop
$260United Airlines
Find Deal
Sat, Apr 25 - Sat, May 2
United Airlines Logo
5:20 am - 12:15 pmSAT-STL
6h 55m2 stops
United Airlines Logo
4:45 pm - 10:59 pmSTL-SAT
6h 14m1 stop
$274United Airlines
Find Deal
Tue, Dec 9 - Tue, Dec 9
Delta Logo
6:10 pm - 11:29 pmSAT-STL
5h 19m1 stop
Delta Logo
5:12 pm - 12:34 amSTL-SAT
7h 22m1 stop
$279Delta
Find Deal
Thu, Dec 4 - Mon, Dec 8
Southwest Logo
10:15 am - 12:20 pmSAT-STL
2h 05mnonstop
Southwest Logo
5:00 pm - 10:15 pmSTL-SAT
5h 15m1 stop
$289Southwest
Find Deal
Wed, Jan 14 - Mon, Jan 19
Southwest Logo
12:30 pm - 2:40 pmSAT-STL
2h 10mnonstop
Southwest Logo
6:15 pm - 11:20 pmSTL-SAT
5h 05m1 stop
$299Southwest
Find Deal
Tue, Dec 9 - Tue, Dec 9
Delta Logo
5:50 pm - 11:01 pmSAT-STL
5h 11m1 stop
Delta Logo
9:00 am - 3:21 pmSTL-SAT
6h 21m1 stop
$309Delta
Find Deal
Mon, Apr 27 - Tue, Apr 28

Frontier flights from San Antonio to St. Louis

Our best Frontier deals on San Antonio to St. Louis flight tickets
Frontier
Nov 20
SAT2:08 pmSan Antonio
7h 01m
1 stop
STL9:09 pmLambert-St Louis
Nov 23
STL10:24 amLambert-St Louis
8h 20m
1 stop
SAT6:44 pmSan Antonio
$127
Find similar
Frontier
Nov 27
SAT2:08 pmSan Antonio
7h 01m
1 stop
STL9:09 pmLambert-St Louis
Dec 6
STL7:43 pmLambert-St Louis
13h 47m
1 stop
SAT9:30 amSan Antonio
$138
Find similar
Frontier
Nov 22
SAT7:04 pmSan Antonio
28h 53m
1 stop
STL11:57 pmLambert-St Louis
Nov 26
STL7:43 pmLambert-St Louis
18h 45m
1 stop
SAT2:28 pmSan Antonio
$141
Find similar

United Airlines flights from San Antonio to St. Louis

Our best United Airlines deals on San Antonio to St. Louis flight tickets
United Airlines
Apr 25
SAT7:30 amSan Antonio
6h 48m
2 stops
STL2:18 pmLambert-St Louis
May 2
STL6:15 amLambert-St Louis
4h 33m
1 stop
SAT10:48 amSan Antonio
$260
Find similar
United Airlines
Dec 9
SAT5:20 amSan Antonio
6h 55m
2 stops
STL12:15 pmLambert-St Louis
Dec 9
STL4:45 pmLambert-St Louis
6h 14m
1 stop
SAT10:59 pmSan Antonio
$274
Find similar
United Airlines
Dec 20
SAT5:59 pmSan Antonio
3h 56m
1 stop
STL9:55 pmLambert-St Louis
Jan 1
STL6:00 amLambert-St Louis
7h 17m
1 stop
SAT1:17 pmSan Antonio
$294
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 6, 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 11/20

2:08 pm-9:09 pm

1 stop7h 01m

Lambert-St Louis

Sun 11/23

10:24 am-6:44 pm

1 stop8h 20m

$127

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 11/27

2:08 pm-9:09 pm

1 stop7h 01m

Lambert-St Louis

Sat 12/6

7:43 pm-9:30 am

1 stop13h 47m

$138

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 12/4

11:53 am-7:30 pm

1 stop7h 37m

Lambert-St Louis

Mon 12/8

5:30 pm-10:16 pm

1 stop4h 46m

$179

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Wed 1/14

7:00 am-11:03 am

1 stop4h 03m

Lambert-St Louis

Sun 1/18

3:37 pm-10:58 pm

1 stop7h 21m

$242

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Sat 4/25

7:30 am-2:18 pm

2 stops6h 48m

Lambert-St Louis

Sat 5/2

6:15 am-10:48 am

1 stop4h 33m

$260

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 12/9

5:20 am-12:15 pm

2 stops6h 55m

Lambert-St Louis

Tue 12/9

4:45 pm-10:59 pm

1 stop6h 14m

$274

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 12/4

6:10 pm-11:29 pm

1 stop5h 19m

Lambert-St Louis

Mon 12/8

5:12 pm-12:34 am

1 stop7h 22m

$279

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Wed 1/14

10:15 am-12:20 pm

Nonstop2h 05m

Lambert-St Louis

Mon 1/19

5:00 pm-10:15 pm

1 stop5h 15m

$289

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 12/9

12:30 pm-2:40 pm

Nonstop2h 10m

Lambert-St Louis

Tue 12/9

6:15 pm-11:20 pm

1 stop5h 05m

$299

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Mon 4/27

5:50 pm-11:01 pm

1 stop5h 11m

Lambert-St Louis

Tue 4/28

9:00 am-3:21 pm

1 stop6h 21m

$309

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 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 January is another great option to travel to St. Louis, with average flight prices from San Antonio averaging around $274.

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 $342 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 54% 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
3,115 reviews
Search Frontier flights
DeltaPriceFrom $196Free CancellationRating
7.9
8,001 reviews
Search Delta flights
American AirlinesPriceFrom $198Free CancellationRating
7.2
11,040 reviews
Search American Airlines flights
SouthwestPriceFrom $227Free CancellationRating
8.0
4,241 reviews
Search Southwest flights
United AirlinesPriceFrom $248Free CancellationRating
7.4
9,007 reviews
Search United Airlines flights

  • Southwest Flights From San Antonio to St. Louis

    Southwest flies from San Antonio to St. Louis around 6 times per week, with 4,241 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.

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 12/6
Sat 12/13
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States