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$99+ Cheap flights from San Antonio to St. Louis (SAT - STL)

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 9/2. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — STL
Jul 6 — Jul 131
Sun 7/6
Sun 7/13
1 adult, Economy
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Cheapflights Tip: The best prices from San Antonio to Lambert-St Louis are usually found in February or August, booked 46 days in advance, depart on a Wednesday or Thursday and return on a Tuesday

Cheap flight deals from San Antonio to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from San Antonio (SAT) to St. Louis (STL). 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 1, 2025.

Round-trip from

$197
(Southwest)

One-way from

$99
(Southwest)

Popular in

November

Cheapest in

February

Average price

$335

Good round-trip deal

$268 or less

Good one-way deal

$169 or less
From San Antonio to Lambert-St Louis
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One-way flight from San Antonio to Lambert-St Louis
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Highest demand for flights based on searches. 11% potential increase in price ($44 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 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 San Antonio to Lambert-St Louis.
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Price to beat on a one-way flight from San Antonio to Lambert-St Louis.
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Find flight deals from San Antonio to St. Louis

Cheapest flights from San Antonio to St. Louis
Explore the most affordable flight options available from San Antonio to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 1, 2025.

This Southwest deal was found by Cheapflights users on 6/30. 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.
Tue 8/53:40 pmSAT - STL
Nonstop2h 10mSouthwest
Tue 8/123:45 pmSTL - SAT
Nonstop2h 10mSouthwest
Deal found 6/30$197
This FlightHub deal was found by Cheapflights users on 7/1. 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.
Tue 8/57:10 amSAT - STL
1 stop9h 21mSpirit Airlines
Sun 8/1010:47 amSTL - SAT
1 stop21h 17mSpirit Airlines
Deal found 7/1$221
This Delta deal was found by Cheapflights users on 6/30. 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.
Sat 8/166:40 amSAT - STL
1 stop7h 48mDelta
Mon 8/181:26 pmSTL - SAT
1 stop6h 04mDelta
Deal found 6/30$223
This American Airlines deal was found by Cheapflights users on 7/1. 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.
Thu 7/311:25 pmSAT - STL
1 stop6h 54mAmerican Airlines
Mon 8/47:38 pmSTL - SAT
1 stop4h 20mAmerican Airlines
Deal found 7/1$228
This FlightHub deal was found by Cheapflights users on 6/29. 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.
Tue 7/86:59 pmSAT - STL
1 stop14h 12mMultiple Airlines
Wed 7/3011:24 amSTL - SAT
1 stop7h 58mMultiple Airlines
Deal found 6/29$244
This United Airlines deal was found by Cheapflights users on 6/30. 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.
Fri 10/35:56 pmSAT - STL
1 stop4h 03mUnited Airlines
Mon 10/63:23 pmSTL - SAT
2 stops7h 34mUnited Airlines
Deal found 6/30$261
This CheapOair deal was found by Cheapflights users on 6/29. 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.
Tue 7/156:59 pmSAT - STL
1 stop14h 12mFrontier
Sat 7/197:29 pmSTL - SAT
1 stop23h 44mFrontier
Deal found 6/29$265

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated July 1, 2025.
Use the filters below to find and compare flights from San Antonio to St. Louis that are best for you.

Fly from

San Antonio

Fly to

St. Louis

Route

Depart

Return

Price

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 8/5

3:40 pm-5:50 pm

Nonstop2h 10m

Lambert-St Louis

Tue 8/12

3:45 pm-5:55 pm

Nonstop2h 10m

$197

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 8/5

10:45 am-6:47 pm

1 stop8h 02m

Lambert-St Louis

Tue 8/12

9:17 am-2:31 pm

1 stop5h 14m

$207

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 8/5

7:10 am-4:31 pm

1 stop9h 21m

Lambert-St Louis

Sun 8/10

10:47 am-8:04 am

1 stop21h 17m

$221

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 7/31

1:25 pm-8:19 pm

1 stop6h 54m

Lambert-St Louis

Mon 8/4

7:38 pm-11:58 pm

1 stop4h 20m

$228

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 7/8

6:59 pm-9:11 am

1 stop14h 12m

Lambert-St Louis

Wed 7/30

11:24 am-7:22 pm

1 stop7h 58m

$244

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 7/15

6:59 pm-9:11 am

1 stop14h 12m

Lambert-St Louis

Sat 7/19

7:29 pm-7:13 pm

1 stop23h 44m

$265

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Fri 8/22

5:30 am-12:25 pm

2 stops6h 55m

Lambert-St Louis

Mon 8/25

6:15 am-10:37 am

1 stop4h 22m

$318

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 9/2

3:40 pm-5:50 pm

Nonstop2h 10m

$99

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Mon 8/25

6:40 am-2:37 pm

1 stop7h 57m

$104

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Sat 8/2

7:10 am-2:39 pm

1 stop7h 29m

$106

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

Showing 1-10 of 14 results
1
2

Best time to book a flight from San Antonio to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from San Antonio 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 San Antonio to St. Louis

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

Use this chart to determine the optimal time to book a round-trip flight from San Antonio to St. Louis. Price data was last updated on June 27, 2025.

To ensure you get the cheapest price possible for a flight from San Antonio to St. Louis, you should look to book at least 46 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, August is the cheapest month in which you can book a flight from San Antonio to St. Louis (average of $311). Flying from San Antonio to St. Louis in March is currently the most expensive (average of $356). 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 SAT to STL?

Find hourly flight availability from San Antonio to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 1, 2025.

When flying from San Antonio to St. Louis, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 64% versus a flight at noon.

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

Use this chart to determine the cheapest time to fly round-trip from San Antonio to St. Louis. Price data was last updated on June 29, 2025.

Travelers seeking maximum savings on their San Antonio to St. Louis flight should consider departing on Monday 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 St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated July 1, 2025.
See what other customers who have flown with Southwest, Delta, and United Airlines from San Antonio to St. Louis have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,275 reviews

Food

7.0

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.6

Entertainment

7.6

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
4,275 reviews
Southwest
8.0
Very good
4,275 reviews

Food

7.0

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.6

Entertainment

7.6

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
7,974 reviews
Southwest
8.0
Very good
4,275 reviews

Food

7.0

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.6

Entertainment

7.6

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
8,858 reviews
Southwest
8.0
Very good
4,275 reviews

Food

7.0

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.6

Entertainment

7.6

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
4,275 reviews

Food

7.0

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.6

Entertainment

7.6

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
8,100 reviews
Southwest
8.0
Very good
4,275 reviews

Food

7.0

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.6

Entertainment

7.6

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 San Antonio to St. Louis. 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 San Antonio to St. Louis?

    You will need to book a flight from San Antonio to Lambert-St Louis if you want to fly from San Antonio to St. Louis. At least 5 different airlines have flights from San Antonio (SAT) to Lambert-St Louis (STL) on a regular basis. There is 1 flight to St. Louis from the San Antonio airport per day. If you manage to book one that is nonstop, then you can expect the flight time from SAT to STL to be around 2h 05m.

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

    This flight path from San Antonio to Lambert-St Louis was viewed by 5 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

    Southwest, at $197, was found to be the cheapest airline from San Antonio to St. Louis.Alternate airlines to your destination round-trip include Spirit Airlines and Delta. Users have found that Southwest is 41% cheaper than the other options available to this destination.

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

    To fly one-way, consider booking your trip with Southwest, which is currently one of the cheapest options available, starting at $99. Delta flights start at $104 while deals on Spirit Airlines start at $106 one-way.

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

    On average you can expect to pay $297 for a flight from San Antonio to St. Louis. The cheapest flight overall is $133 while the most popular route, (San Antonio - Lambert-St Louis) is currently priced at $197.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from San Antonio to St. Louis 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 San Antonio to St. Louis?

    Currently, August is the cheapest month in which you can book a flight from San Antonio to St. Louis (average of $311). Flying from San Antonio to St. Louis in March is currently the most expensive (average of $356). 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
O'Fallon
Maryland Heights
Fairview Heights
Collinsville
Eureka
St. Peters
Glencoe
Alton
Festus
Chesterfield
Farmington

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Alternative routes for San Antonio to St. Louis

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Top 5 airlines flying from San Antonio to St. Louis

Discover the top 5 airlines that operate flights from San Antonio to St. Louis. 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 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$128Average$211FlexibilityNo cancel feeOn-time62%
DeltaCheapest$134Average$246FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$196Average$348FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$238Average$414FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$248Average$328FlexibilityNo cancel feeOn-time69%

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