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$80+ 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 5/13. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SAT
Mar 26 — Apr 21
Wed 3/26
Wed 4/2
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to San Antonio are usually found in August or May, booked 56 days in advance, depart on a Tuesday or Monday and return on a Thursday

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 March 21, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$177
(Southwest)

One-way from

$89
(Southwest)

Popular in

June

Cheapest in

August

Average price

$343

Good round-trip deal

$258 or less

Good one-way deal

$228 or less
Provider with most accurate pricing for Lambert-St Louis-San Antonio flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-San Antonio flights.
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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. 1% potential increase in price ($5 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 March 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 March 21, 2025.

This Southwest deal was found by Cheapflights users on 3/21. 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 5/16:10 pmSTL - SAT
Nonstop2h 15mSouthwest
Mon 5/55:00 amSAT - STL
Nonstop2h 05mSouthwest
Deal found 3/21$177
This Delta deal was found by Cheapflights users on 3/20. 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 4/145:32 pmSTL - SAT
1 stop6h 58mDelta
Tue 4/155:30 amSAT - STL
1 stop6h 15mDelta
Deal found 3/20$197
This Mytrip deal was found by Cheapflights users on 3/20. 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.
Sun 4/276:10 pmSTL - SAT
1 stop15h 04mSpirit Airlines
Tue 4/2910:09 amSAT - STL
1 stop7h 06mSpirit Airlines
Deal found 3/20$215
This American Airlines deal was found by Cheapflights users on 3/20. 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.
Sun 4/135:26 amSTL - SAT
1 stop6h 17mAmerican Airlines
Tue 4/155:00 amSAT - STL
1 stop5h 25mAmerican Airlines
Deal found 3/20$223
This United Airlines deal was found by Cheapflights users on 3/19. 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.
Thu 5/15:20 amSTL - SAT
1 stop7h 42mUnited Airlines
Mon 5/54:21 pmSAT - STL
1 stop5h 42mUnited Airlines
Deal found 3/19$231
This CheapOair deal was found by Cheapflights users on 3/19. 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 5/1510:10 amSTL - SAT
1 stop12h 41mMultiple Airlines
Sun 5/188:25 pmSAT - STL
1 stop12h 44mMultiple Airlines
Deal found 3/19$247
This CheapOair deal was found by Cheapflights users on 3/21. 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.
Fri 4/46:51 pmSTL - SAT
1 stop18h 26mFrontier
Sat 4/58:02 pmSAT - STL
1 stop16h 14mFrontier
Deal found 3/21$251
This Alaska Airlines deal was found by Cheapflights users on 3/21. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/226:30 amSTL - SAT
1 stop17h 29mAlaska Airlines
Mon 4/287:33 pmSAT - STL
1 stop28h 26mAlaska Airlines
Deal found 3/21$542
This Kiwi.com deal was found by Cheapflights users on 3/21. 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.
Thu 5/16:30 amSTL - SAT
1 stop12h 07mHawaiian Airlines
Mon 5/56:35 amSAT - STL
1 stop17h 24mHawaiian Airlines
Deal found 3/21$809

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 March 21, 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

Thu 5/1

6:10 pm-8:25 pm

Nonstop2h 15m

San Antonio

Mon 5/5

5:00 am-7:05 am

Nonstop2h 05m

$177

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Mon 4/14

5:32 pm-12:30 am

1 stop6h 58m

San Antonio

Tue 4/15

5:30 am-11:45 am

1 stop6h 15m

$197

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Sun 4/27

6:10 pm-9:14 am

1 stop15h 04m

San Antonio

Tue 4/29

10:09 am-5:15 pm

1 stop7h 06m

$215

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Sun 4/13

5:26 am-11:43 am

1 stop6h 17m

San Antonio

Tue 4/15

5:00 am-10:25 am

1 stop5h 25m

$223

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Thu 5/1

5:20 am-1:02 pm

1 stop7h 42m

San Antonio

Mon 5/5

4:21 pm-10:03 pm

1 stop5h 42m

$231

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Thu 5/15

10:10 am-10:51 pm

1 stop12h 41m

San Antonio

Sun 5/18

8:25 pm-9:09 am

1 stop12h 44m

$247

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Fri 4/4

6:51 pm-1:17 pm

1 stop18h 26m

San Antonio

Sat 4/5

8:02 pm-12:16 pm

1 stop16h 14m

$251

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Tue 4/22

6:30 am-11:59 pm

1 stop17h 29m

San Antonio

Mon 4/28

7:33 pm-11:59 pm

1 stop28h 26m

$542

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Thu 5/1

6:30 am-6:37 pm

1 stop12h 07m

San Antonio

Mon 5/5

6:35 am-11:59 pm

1 stop17h 24m

$809

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Tue 5/13

7:19 pm-11:58 pm

1 stop4h 39m

$80

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/21

Showing 1-10 of 16 results
1
2

Compare providers for flights from St. Louis to San Antonio

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to San Antonio in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*3 stars
GotogatePrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on St. Louis-San Antonio flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-San Antonio flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-San Antonio flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-San Antonio flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-San Antonio flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 March 14, 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 March 21, 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 at noon, which can drop the price by up to 13% 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 March 16, 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. Wednesday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in San Antonio by month

Plan your trip to San Antonio by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in San Antonio ranges from 1.6 - 3.7 inches per month. May is typically the wettest month, when rainfall can reach 3.7 in. December is typically the driest time to visit San Antonio when rainfall is around 1.6 in.

Temperature in San Antonio by month

Plan your trip to San Antonio by taking into account the average temperature totals by month.

If weather is an important factor for your trip to San Antonio, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 84.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 51.8 F).

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 March 21, 2025.
Peruse reviews from past customers who have flown with Southwest, Alaska Airlines and Delta from St. Louis to San Antonio to help guide your decision. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,281 reviews

Comfort

8.1

Entertainment

7.6

Overall

8.1

Crew

8.7

Boarding

8.2

Food

7.1

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
8.1
Very good
4,281 reviews
Southwest
8.1
Very good
4,281 reviews

Comfort

8.1

Entertainment

7.6

Overall

8.1

Crew

8.7

Boarding

8.2

Food

7.1

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.
Alaska Airlines
8.0
Very good
9,759 reviews
Southwest
8.1
Very good
4,281 reviews

Comfort

8.1

Entertainment

7.6

Overall

8.1

Crew

8.7

Boarding

8.2

Food

7.1

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
7,895 reviews
Southwest
8.1
Very good
4,281 reviews

Comfort

8.1

Entertainment

7.6

Overall

8.1

Crew

8.7

Boarding

8.2

Food

7.1

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.
Hawaiian Airlines
7.9
Good
2,325 reviews
Southwest
8.1
Very good
4,281 reviews

Comfort

8.1

Entertainment

7.6

Overall

8.1

Crew

8.7

Boarding

8.2

Food

7.1

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
8,605 reviews
Southwest
8.1
Very good
4,281 reviews

Comfort

8.1

Entertainment

7.6

Overall

8.1

Crew

8.7

Boarding

8.2

Food

7.1

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 are 2 flights 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.

  • 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 Southwest. Our recent data shows that you can find tickets from as low as $177 on this airline. Additional options worth looking into are Delta and Spirit Airlines, starting at $197 and $215 round-trip. Southwest is currently priced 47% 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 Southwest. According to our data, you can fly for as low as $89. Users have also found prices from $97 and $99 on Spirit Airlines and Delta, 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 $322, our data indicates the cheapest price to be $88. The most popular route (Lambert-St Louis - San Antonio), is priced around $177.

  • 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 St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
New Braunfels

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Alternative routes for St. Louis to San Antonio

See prices for flight routes from nearby airports that may be better suited for you.
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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 March 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$128Average$204FlexibilityNo cancel feeOn-time62%
DeltaCheapest$167Average$291FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$197Average$401FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$212Average$343FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$218Average$317FlexibilityNo cancel feeOn-time69%
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