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$94+ 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 8/25. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SAT
Aug 2 — Aug 91
Sat 8/2
Sat 8/9
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 August, booked 56 days in advance, depart on a Tuesday or Saturday 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 July 28, 2025.

Round-trip from

$205
(FlightHub)

One-way from

$94
(American Airlines)

Popular in

December

Cheapest in

April

Average price

$321

Good round-trip deal

$307 or less

Good one-way deal

$208 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. 3% potential increase in price ($12 potential increase over avg. RT price).
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Cheapest flight prices on average. 0% potential price decrease ($2 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Lambert-St Louis to San Antonio.
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Price to beat on a one-way 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 July 28, 2025.

This FlightHub deal was found by Cheapflights users on 7/26. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/17:55 pmSTL - SAT
1 stop23h 20mFrontier
Sat 10/43:22 pmSAT - STL
1 stop17h 44mFrontier
Deal found 7/26$205
This CheapOair deal was found by Cheapflights users on 7/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1810:35 amSTL - SAT
1 stop7h 37mMultiple Airlines
Sun 9/218:20 pmSAT - STL
1 stop12h 46mMultiple Airlines
Deal found 7/28$224
This American Airlines deal was found by Cheapflights users on 7/26. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/145:20 amSTL - SAT
1 stop3h 59mAmerican Airlines
Sat 10/184:37 pmSAT - STL
1 stop4h 16mAmerican Airlines
Deal found 7/26$227
This Southwest deal was found by Cheapflights users on 7/25. 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.
Thu 8/287:10 pmSTL - SAT
Nonstop2h 05mSouthwest
Mon 9/15:00 amSAT - STL
Nonstop2h 10mSouthwest
Deal found 7/25$240
This Delta deal was found by Cheapflights users on 7/27. 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.
Mon 8/185:11 pmSTL - SAT
1 stop5h 11mDelta
Tue 8/192:10 pmSAT - STL
1 stop4h 57mDelta
Deal found 7/27$243
This United Airlines deal was found by Cheapflights users on 7/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/16:15 amSTL - SAT
1 stop7h 00mUnited Airlines
Sat 10/45:30 amSAT - STL
2 stops8h 57mUnited Airlines
Deal found 7/28$302
This Mytrip deal was found by Cheapflights users on 7/27. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1110:47 amSTL - SAT
3 stops31h 49mSpirit Airlines
Thu 8/144:50 pmSAT - STL
2 stops20h 42mSpirit Airlines
Deal found 7/27$350

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 July 28, 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

Wed 10/1

7:55 pm-7:15 pm

1 stop23h 20m

San Antonio

Sat 10/4

3:22 pm-9:06 am

1 stop17h 44m

$205

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Thu 9/18

10:35 am-6:12 pm

1 stop7h 37m

San Antonio

Sun 9/21

8:20 pm-9:06 am

1 stop12h 46m

$224

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Tue 10/14

5:20 am-9:19 am

1 stop3h 59m

San Antonio

Tue 10/21

6:24 pm-11:54 pm

1 stop5h 30m

$227

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Wed 10/1

11:10 am-8:10 pm

2 stops9h 00m

San Antonio

Sat 10/4

11:50 am-5:10 pm

1 stop5h 20m

$242

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Mon 8/18

5:11 pm-10:22 pm

1 stop5h 11m

San Antonio

Tue 8/19

2:10 pm-7:07 pm

1 stop4h 57m

$243

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Wed 10/1

6:15 am-1:15 pm

1 stop7h 00m

San Antonio

Sat 10/4

5:30 am-2:27 pm

2 stops8h 57m

$302

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Mon 8/11

10:47 am-6:36 pm

3 stops31h 49m

San Antonio

Thu 8/14

4:50 pm-1:32 pm

2 stops20h 42m

$350

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Thu 9/4

10:35 am-6:12 pm

1 stop7h 37m

$105

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Wed 8/27

7:54 pm-7:33 pm

1 stop23h 39m

$107

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Tue 9/16

3:45 pm-5:55 pm

Nonstop2h 10m

$109

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 13 results
1
2

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 July 25, 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 July 28, 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 16% versus a flight in the evening.

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 July 27, 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.

What’s the top layover airport for flights from St. Louis to San Antonio?

Share of 1-stop round-trip flights from St. Louis to San Antonio chosen by Cheapflights users in the past 12 months, using the same layover each way.

Houston (IAH) – chosen by Cheapflights users on 50% of 1-stop itineraries from St. Louis to San Antonio on Cheapflights.

What’s the cheapest layover airport for flights from St. Louis to San Antonio?

Average round-trip fare for 1-stop flights from St. Louis to San Antonio, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Las Vegas (LAS) is the most affordable 1-stop option, with an average round-trip price of $201.

What’s the fastest layover option from St. Louis to San Antonio?

Shortest average travel time for 1-stop one-way flights from St. Louis to San Antonio, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Houston (IAH) have the shortest average one-way travel time for 1-stop routes: 2h 17m.

Which airport typically offers the quickest layover for flights from St. Louis to San Antonio?

Average layover duration for 1-stop one-way flights from St. Louis to San Antonio, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Houston (IAH) offer the fastest connection on this route, with an average layover time of 1h 19m.

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 July 28, 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
4,237 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.0
Very good
4,237 reviews
Southwest
8.0
Very good
4,237 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Delta
8.0
Very good
7,971 reviews
Southwest
8.0
Very good
4,237 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
United Airlines
7.4
Good
8,893 reviews
Southwest
8.0
Very good
4,237 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,237 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Spirit Airlines
6.3
Okay
8,034 reviews
Southwest
8.0
Very good
4,237 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

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 05m 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, 1 users have taken a look at flights from Lambert-St Louis to San Antonio.

  • 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 Frontier. Our recent data shows that you can find tickets from as low as $205 on this airline. Additional options worth looking into are American Airlines and Southwest, starting at $227 and $240 round-trip. Frontier is currently priced 36% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from St. Louis to San Antonio one-way?

    For one-way options, check prices for American Airlines. According to our data, you can fly for as low as $94. Users have also found prices from $107 and $112 on Frontier and Spirit Airlines, respectively.

  • 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 $303, our data indicates the cheapest price to be $108. The most popular route (Lambert-St Louis - San Antonio), is priced around $217.

  • 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

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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 July 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$124Average$268FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$128Average$217FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$200Average$394FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$217Average$309FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$218Average$315FlexibilityNo cancel feeOn-time71%

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