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$78+ Cheap flights from St. Louis to San Antonio (STL - SAT)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/27. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SAT
oct. 11 — oct. 181
sáb. 10/11
sáb. 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to San Antonio are usually found in April or May, booked 56 days in advance, depart on a Saturday or Tuesday and return on a Wednesday

Cheap flight deals from St. Louis to San Antonio

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to San Antonio (SAT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated septiembre 11, 2025.

Round-trip from

$164
(Booking.com)

One-way from

$78
(Southwest)

Popular in

December

Cheapest in

April

Average price

$315

Good round-trip deal

$287 or less
From Lambert-St Louis to San Antonio
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One-way flight from Lambert-St Louis to San Antonio
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Highest demand for flights based on searches. 5% potential increase in price ($19 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Lambert-St Louis to San Antonio.
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Find flight deals from St. Louis to San Antonio

Cheapest flights from St. Louis to San Antonio
Explore the most affordable flight options available from St. Louis to San Antonio. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septiembre 11, 2025.

This Booking.com deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/67:45 pmSTL - SAT
1 stop23h 45mFrontier
lun. 11/108:25 pmSAT - STL
1 stop12h 42mFrontier
Deal found 9/8$164
This Kiwi.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/217:52 pmSTL - SAT
1 stop19h 22mFrontier
jue. 10/238:26 pmSAT - STL
1 stop12h 41mFrontier
Deal found 9/10$167
This Kiwi.com deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/207:52 pmSTL - SAT
1 stop19h 22mFrontier
jue. 10/238:26 pmSAT - STL
1 stop12h 41mFrontier
Deal found 9/8$177
This Southwest deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/812:30 pmSTL - SAT
1 stop5h 05mSouthwest
mié. 10/1512:45 pmSAT - STL
1 stop6h 20mSouthwest
Deal found 9/10$185
This Kiwi.com deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/157:52 pmSTL - SAT
1 stop23h 49mFrontier
lun. 10/2010:54 amSAT - STL
1 stop8h 32mFrontier
Deal found 9/8$186
This Kiwi.com deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/157:52 pmSTL - SAT
1 stop23h 49mFrontier
dom. 10/199:52 pmSAT - STL
1 stop13h 51mFrontier
Deal found 9/8$192
This Kiwi.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/147:45 pmSTL - SAT
1 stop18h 32mMultiple Airlines
mar. 11/186:23 pmSAT - STL
2 stops14h 44mMultiple Airlines
Deal found 9/10$193
This Priceline deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/2310:57 amSTL - SAT
1 stop7h 33mMultiple Airlines
lun. 10/2710:54 amSAT - STL
1 stop8h 32mMultiple Airlines
Deal found 9/10$195
This Delta deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/86:00 amSTL - SAT
1 stop6h 10mDelta
lun. 12/86:10 pmSAT - STL
1 stop5h 18mDelta
Deal found 9/11$197
This Kiwi.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/912:10 pmSTL - SAT
2 stops23h 02mMultiple Airlines
sáb. 11/153:12 pmSAT - STL
1 stop17h 55mMultiple Airlines
Deal found 9/10$198
This Kiwi.com deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/136:22 pmSTL - SAT
2 stops19h 45mMultiple Airlines
dom. 11/168:25 pmSAT - STL
1 stop12h 42mMultiple Airlines
Deal found 9/9$199
This Kiwi.com deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/157:52 pmSTL - SAT
1 stop23h 49mFrontier
vie. 10/178:20 pmSAT - STL
1 stop12h 47mFrontier
Deal found 9/8$207

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to San Antonio 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, Cheapflights users made 2,558,603 searches. Data last updated septiembre 11, 2025.
Use the filters below to find and compare flights from St. Louis to San Antonio that are best for you.

Fly from

St. Louis

Fly to

San Antonio

Route

Depart

Return

Price

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

vie. 10/24

6:52 pm-12:20 am

1 stop5h 28m

San Antonio

lun. 10/27

5:09 pm-11:41 pm

1 stop6h 32m

$215

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

vie. 11/14

6:00 am-1:41 pm

1 stop7h 41m

San Antonio

mar. 11/18

3:00 pm-9:58 pm

1 stop6h 58m

$215

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

jue. 11/13

11:44 am-5:17 pm

1 stop5h 33m

San Antonio

dom. 11/16

6:22 pm-11:40 pm

1 stop5h 18m

$226

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

jue. 10/2

6:01 am-12:22 pm

1 stop6h 21m

San Antonio

dom. 10/5

6:02 pm-11:16 pm

1 stop5h 14m

$226

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

sáb. 11/22

11:44 am-6:16 pm

1 stop6h 32m

San Antonio

jue. 11/27

5:15 am-10:04 am

1 stop4h 49m

$228

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

vie. 10/24

6:52 pm-12:20 am

1 stop5h 28m

San Antonio

sáb. 10/25

6:41 am-12:35 pm

1 stop5h 54m

$233

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

vie. 1/9

6:20 am-10:15 am

1 stop3h 55m

San Antonio

mié. 1/14

10:10 am-4:50 pm

2 stops6h 40m

$239

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

vie. 11/14

9:50 am-12:10 pm

Nonstop2h 20m

San Antonio

mar. 11/18

3:05 pm-9:25 pm

1 stop6h 20m

$248

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

vie. 10/24

6:15 am-1:15 pm

1 stop7h 00m

San Antonio

sáb. 10/25

5:30 am-2:27 pm

2 stops8h 57m

$254

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

vie. 10/17

8:25 am-3:25 pm

1 stop7h 00m

San Antonio

dom. 10/19

4:21 pm-10:00 pm

1 stop5h 39m

$256

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

Showing 1-10 of 22 results
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Best time to book a flight from St. Louis to San Antonio

Have a flexible travel schedule? Discover the best time to fly to San Antonio from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to San Antonio

How far ahead should I book a flight from St. Louis to San Antonio?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to San Antonio. Price data was last updated on August 29, 2025.

Booking 56 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to San Antonio. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from St. Louis to San Antonio?

Currently, August is the cheapest month in which you can book a flight from St. Louis to San Antonio (average of $295). Flying from St. Louis to San Antonio in March is currently the most expensive (average of $376). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from STL to SAT?

Find hourly flight availability from St. Louis to San Antonio. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated septiembre 11, 2025.

When flying from St. Louis to San Antonio, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 24% versus a flight at noon.

What is the cheapest day to fly from St. Louis to San Antonio?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to San Antonio. Price data was last updated on September 7, 2025.

Travelers seeking maximum savings on their St. Louis to San Antonio flight should consider departing on Saturday evenings when fares are most often at their lowest. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing San Antonio

Get insights into the airlines that provide service to San Antonio. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Antonio. Reviews last updated septiembre 11, 2025.
Read through reviews of airlines operating flights from St. Louis to San Antonio, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,248 reviews

Comfort

8.0

Entertainment

7.5

Overall

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Comfort

8.0

Entertainment

7.5

Overall

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
8.0
Very good
7,960 reviews
Southwest
8.0
Very good
4,248 reviews

Comfort

8.0

Entertainment

7.5

Overall

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,937 reviews
Southwest
8.0
Very good
4,248 reviews

Comfort

8.0

Entertainment

7.5

Overall

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,248 reviews

Comfort

8.0

Entertainment

7.5

Overall

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,177 reviews
Southwest
8.0
Very good
4,248 reviews

Comfort

8.0

Entertainment

7.5

Overall

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

Find useful and relevant information for your journey from St. Louis to San Antonio. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airports do I use to fly from St. Louis to San Antonio?

    Booking a flight from Lambert-St Louis (STL) to San Antonio (SAT) is your only option if you wish to fly from St. Louis to San Antonio. On a typical day, there is 1 flight from Lambert-St Louis to San Antonio, all of which are around 2h 10m for a nonstop flight. You can also purchase a plane ticket from 5 airlines when you book a flight from Lambert-St Louis to San Antonio.

  • How popular is this St. Louis to San Antonio flight route?

    Within the past month, 6 users have taken a look at flights from Lambert-St Louis to San Antonio.

  • How long is the flight from St. Louis to San Antonio?

    Departing from St. Louis to San Antonio will take you 5h 28m. The distance from St. Louis to San Antonio is about 786 mi.

  • What are the cheapest airlines flying from St. Louis to San Antonio round-trip?

    Our cheapest airline available from St. Louis to San Antonio is Delta. Our recent data shows that you can find tickets from as low as $124 on this airline. Additional options worth looking into are Frontier and Southwest, starting at $128 and $200 round-trip. Delta is currently priced 62% below the average price you’ll pay for this route.

  • What are the cheapest flights from St. Louis to San Antonio?

    Looking for the cheapest flight from St. Louis to San Antonio? While on average our users pay $307, our data indicates the cheapest price to be $213. The most popular route (Lambert-St Louis - San Antonio), is priced around $185.

  • Can I find deals for flights from St. Louis to San Antonio that include hotel bookings?

    Yes. In addition to deals on St. Louis to San Antonio flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to San Antonio?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to San Antonio.

  • Can I find deals for business class flights from St. Louis to San Antonio?

    Yes. Cheapflights offers flight deals from St. Louis to San Antonio by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to San Antonio?

    Currently, August is the cheapest month in which you can book a flight from St. Louis to San Antonio (average of $295). Flying from St. Louis to San Antonio in March is currently the most expensive (average of $376). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near San Antonio?

Book flights to San Antonio if you plan to visit one of these locations
New Braunfels
Kerrville

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Alternative routes for St. Louis to San Antonio

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Top 5 airlines flying from St. Louis to San Antonio

Discover the top 5 airlines that operate flights from St. Louis to San Antonio. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated septiembre 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$124Average$268FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$128Average$217FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$200Average$392FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$212Average$311FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$218Average$313FlexibilityNo cancel feeOn-time71%

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