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$61+ 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 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — STL
Nov 25 — Dec 21
Tue 11/25
Tue 12/2
1 adult, Economy
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Find cheap flights from San Antonio to St. Louis with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from San Antonio to Lambert-St Louis are usually found in August or January, booked 46 days in advance, depart on a Wednesday or Thursday and return on a Saturday

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 October 26, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$143
(CheapOair)

One-way from

$61
(CheapOair)

Popular in

October

Cheapest in

August

Average price

$478

Good round-trip deal

$368 or less

Good one-way deal

$193 or less
Provider with most accurate pricing for San Antonio-Lambert-St Louis flight deals.
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Provider most trusted by Cheapflights users for San Antonio-Lambert-St Louis flights.
Search Deals
From San Antonio to Lambert-St Louis
Search Deals
One-way flight from San Antonio to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($68 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals
Price to beat on a round-trip flight from San Antonio to Lambert-St Louis.
Search Deals
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 October 26, 2025.

This CheapOair deal was found by Cheapflights users on 10/25. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/108:25 pmSAT - STL
1 stop12h 42mFrontier
Fri 11/145:05 pmSTL - SAT
1 stop24h 05mFrontier
Deal found 10/25$143
This CheapOair deal was found by Cheapflights users on 10/25. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/98:25 pmSAT - STL
1 stop12h 42mFrontier
Thu 11/137:45 pmSTL - SAT
1 stop23h 45mFrontier
Deal found 10/25$169
This CheapOair deal was found by Cheapflights users on 10/24. 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.
Sun 11/168:25 pmSAT - STL
1 stop12h 42mFrontier
Tue 11/187:45 pmSTL - SAT
1 stop23h 00mFrontier
Deal found 10/24$183
This Frontier deal was found by Cheapflights users on 10/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/138:38 pmSAT - STL
1 stop12h 29mFrontier
Thu 11/279:54 pmSTL - SAT
1 stop12h 50mFrontier
Deal found 10/25$190
This CheapOair deal was found by Cheapflights users on 10/25. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/308:43 pmSAT - STL
1 stop12h 24mFrontier
Thu 11/67:45 pmSTL - SAT
1 stop23h 45mFrontier
Deal found 10/25$202
This CheapOair deal was found by Cheapflights users on 10/24. 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 10/247:10 pmSAT - STL
1 stop20h 28mFrontier
Sun 10/2611:32 amSTL - SAT
1 stop5h 20mFrontier
Deal found 10/24$228
This Frontier deal was found by Cheapflights users on 10/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/138:38 pmSAT - STL
1 stop12h 29mFrontier
Sun 11/2310:24 amSTL - SAT
1 stop8h 20mFrontier
Deal found 10/25$230
This Kiwi.com deal was found by Cheapflights users on 10/24. 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.
Sun 11/169:59 amSAT - STL
1 stop25h 25mMultiple Airlines
Tue 11/187:45 pmSTL - SAT
2 stops14h 18mMultiple Airlines
Deal found 10/24$237
This Kiwi.com deal was found by Cheapflights users on 10/24. 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.
Tue 12/96:10 pmSAT - STL
2 stops28h 23mMultiple Airlines
Sat 12/137:43 pmSTL - SAT
1 stop13h 47mMultiple Airlines
Deal found 10/24$238
This American Airlines deal was found by Cheapflights users on 10/24. 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.
Mon 11/247:00 amSAT - STL
1 stop8h 29mAmerican Airlines
Tue 12/22:17 pmSTL - SAT
1 stop7h 32mAmerican Airlines
Deal found 10/24$249

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 October 26, 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

Mon 11/10

8:25 pm-9:07 am

1 stop12h 42m

Lambert-St Louis

Fri 11/14

5:05 pm-5:10 pm

1 stop24h 05m

$143

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Sun 11/16

8:25 pm-9:07 am

1 stop12h 42m

Lambert-St Louis

Tue 11/18

7:45 pm-6:45 pm

1 stop23h 00m

$183

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Wed 1/14

6:00 am-10:37 pm

1 stop16h 37m

Lambert-St Louis

Sat 1/17

7:43 pm-9:25 am

1 stop13h 42m

$194

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Fri 11/7

2:09 pm-3:56 pm

1 stop25h 47m

Lambert-St Louis

Sun 11/9

7:45 pm-7:30 pm

1 stop23h 45m

$202

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 12/9

6:10 pm-10:33 pm

2 stops28h 23m

Lambert-St Louis

Sat 12/13

7:43 pm-9:30 am

1 stop13h 47m

$238

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 12/9

6:30 am-1:04 pm

1 stop6h 34m

Lambert-St Louis

Sat 12/13

6:00 am-11:56 am

1 stop5h 56m

$259

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 12/9

5:10 am-10:45 am

1 stop5h 35m

Lambert-St Louis

Wed 12/10

7:05 am-12:11 pm

1 stop5h 06m

$259

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 11/11

7:37 pm-10:12 am

2 stops38h 35m

Lambert-St Louis

Tue 12/2

3:30 pm-7:21 pm

1 stop27h 51m

$261

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Tue 11/18

5:15 am-1:00 pm

1 stop7h 45m

Lambert-St Louis

Sun 11/23

6:00 am-12:10 pm

1 stop6h 10m

$269

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

Thu 12/4

4:14 pm-9:58 pm

1 stop5h 44m

Lambert-St Louis

Mon 12/8

6:15 am-10:51 am

1 stop4h 36m

$274

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/24

Showing 1-10 of 22 results
1
2
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Compare providers for flights from San Antonio to St. Louis

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 San Antonio to St. Louis in October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust 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 San Antonio-St. Louis flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on San Antonio-St. Louis flight deals on Cheapflights vs. CheapOair >95% of the time. Price accuracy is based on data collected from San Antonio-St. Louis flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on San Antonio-St. Louis flights, Cheapflights users trust CheapOair the most. CheapOair 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 San Antonio-St. Louis 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 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 October 24, 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, May is the cheapest month in which you can book a flight from San Antonio to St. Louis (average of $120). Flying from San Antonio to St. Louis in December is currently the most expensive (average of $248). 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 October 26, 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 59% 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 October 19, 2025.

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

The best insider tips for San Antonio to St. Louis flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your San Antonio to St. Louis trip
Airports
SAT

For longer trips, consider the economy lots with shuttle service for better value than the main parking garage.

Read more about SATby Ramsey Qubein
STL

Use the MetroLink light rail for a convenient and economical trip from STL to downtown St. Louis.

Read more about STLby Taryn White
Our travel experts
Ramsey Qubein

Ramsey Qubein

Expert on SAT

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more
Taryn White

Taryn White

Expert on STL

Taryn White

Taryn White

Taryn White is a freelance travel writer, digital creator, and travel advisor who has visited nearly 100 countries and all 50 states. She’s familiar with many airports and enjoys beach hopping, boutique hotels, spa experiences, and exploring local culture. Her work has appeared in Travel + Leisure, Condé Nast Traveler, National Geographic, Smithsonian Magazine, AFAR, and more.

Read more

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 October 26, 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
4,236 reviews

Entertainment

7.5

Overall

8.0

Crew

8.6

Comfort

8.0

Food

7.0

Boarding

8.1

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
8.0
Very good
4,236 reviews
Southwest
8.0
Very good
4,236 reviews

Entertainment

7.5

Overall

8.0

Crew

8.6

Comfort

8.0

Food

7.0

Boarding

8.1

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
7.9
Good
7,994 reviews
Southwest
8.0
Very good
4,236 reviews

Entertainment

7.5

Overall

8.0

Crew

8.6

Comfort

8.0

Food

7.0

Boarding

8.1

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
9,002 reviews
Southwest
8.0
Very good
4,236 reviews

Entertainment

7.5

Overall

8.0

Crew

8.6

Comfort

8.0

Food

7.0

Boarding

8.1

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.
American Airlines
7.2
Good
11,035 reviews
Southwest
8.0
Very good
4,236 reviews

Entertainment

7.5

Overall

8.0

Crew

8.6

Comfort

8.0

Food

7.0

Boarding

8.1

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.
Frontier
5.8
Fair
3,126 reviews
Southwest
8.0
Very good
4,236 reviews

Entertainment

7.5

Overall

8.0

Crew

8.6

Comfort

8.0

Food

7.0

Boarding

8.1

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 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 9 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

    For as low as $183, Frontier can have you in St. Louis from San Antonio in 12h 42m. San Antonio and St. Louis are separated by a distance of 786 mi.

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

    Delta, at $114, was found to be the cheapest airline from San Antonio to St. Louis.Alternate airlines to your destination round-trip include Frontier and American Airlines. Users have found that Delta is 66% cheaper than the other options available to this destination.

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

    On average you can expect to pay $318 for a flight from San Antonio to St. Louis. The cheapest flight overall is $143 while the most popular route, (San Antonio - Lambert-St Louis) is currently priced at $175.

  • 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, May is the cheapest month in which you can book a flight from San Antonio to St. Louis (average of $120). Flying from San Antonio to St. Louis in December is currently the most expensive (average of $248). 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
Edwardsville
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
St. Peters
Chesterfield
Alton
Farmington
Festus

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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 October 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$114Average$238FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$119Average$328FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$216Average$298FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$227Average$397FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$248Average$383FlexibilityNo cancel feeOn-time69%

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