Cheap flights from St. Louis to San Antonio

Flights overview

Useful information for finding cheap flights from St. Louis to San Antonio and booking your next trip
Cheapest round-trip flights $180
Frontier 1 stop 23 hr Thu, May 28 — Sun, May 31
The cheapest round-trip flight from St. Louis to San Antonio is currently $180
Cheapest one-way flight $96
Frontier 1 stop 23 hr Wed, May 27
The cheapest one-way flight from St. Louis to San Antonio is currently $96
Cheapest nonstop flights $385
Southwest Nonstop 3 hr Thu, May 28 — Mon, Jun 1
The cheapest nonstop round-trip flight from St. Louis to San Antonio is currently $385
Last-minute weekend getaway $236
Frontier 1 stop 22 hr Thu, Apr 30 — Mon, May 4
The cheapest last-minute weekend getaway from St. Louis to San Antonio is currently $236
Cheapest business class flights $448
Frontier 1 stop 24 hr Fri, Jun 5 — Sun, Jun 7
The cheapest business class round-trip flight from St. Louis to San Antonio is currently $448
Fastest flight 2 hr 5 min The fastest nonstop flight from St. Louis to San Antonio takes 2 hr 5 min
Nonstop flights Every day There are direct flights on this route every day.

When is the cheapest time to fly?

The cheapest month to fly from St. Louis to San Antonio is typically September. The most expensive month to fly is typically March.
September
Cheapest
Typical prices: $140–220
March
Most expensive
Typical prices: $220–350

Popular airlines from St. Louis to San Antonio

  • Southwest
    Nonstop
    from $385
    Typical price: $265–550
    13 weekly nonstop flights
    STL - SAT Every day
    807 weekly connecting flights
    STL - SAT Every day
  • American
    from $400
    Typical price: $245–540
    476 weekly connecting flights
    STL - SAT Every day
  • United
    from $311
    Typical price: $245–590
    239 weekly connecting flights
    STL - SAT Every day
  • Delta
    from $395
    Typical price: $250–660
    222 weekly connecting flights
    STL - SAT Every day
  • Alaska
    from $828
    Typical price: $520–1,250
    16 weekly connecting flights
    STL - SAT Every day
  • Frontier
    from $180
    Typical price: $180–400
    8 weekly connecting flights
    STL - SAT Every Mon, Thu, Fri, Sat, Sun

Popular airports near St. Louis

  • St. Louis Lambert International Airport (STL)
    St. Louis United States 21 min 12 mi
  • General Wayne A. Downing Peoria International Airport (PIA)
    Peoria United States 2 hr 36 min 143 mi
  • Columbia Regional Airport (COU)
    Columbia United States 2 hr 8 min 109 mi
  • MidAmerica St. Louis Airport (BLV)
    Belleville United States 34 min 20 mi

Popular airports near San Antonio

  • San Antonio International Airport (SAT)
    San Antonio United States 19 min 7 mi
  • Austin-Bergstrom International Airport (AUS)
    Austin United States 1 hr 21 min 72 mi
  • George Bush Intercontinental Airport (IAH)
    Houston United States 3 hr 9 min 193 mi
  • William P. Hobby Airport (HOU)
    Houston United States 3 hr 14 min 193 mi

Frequently asked questions about flying from St. Louis to San Antonio

The cheapest flights from St. Louis to San Antonio are usually in September. Typical ticket prices in September range from $140 to $220.
The cheapest round-trip flight from St. Louis to San Antonio recently found on Google Flights was with Frontier from $180. The cheapest one-way flight was with Frontier from $96.

Some of the cheapest round-trip deals we found with different airlines:
  • The cheapest Southwest flight from St. Louis to San Antonio is $385, flying from Jun 4 to Jun 8.
  • The cheapest American flight from St. Louis to San Antonio is $400, flying from May 21 to May 24.
  • The cheapest United flight from St. Louis to San Antonio is $311, flying from May 28 to Jun 1.
  • The cheapest Delta flight from St. Louis to San Antonio is $395, flying from May 28 to Jun 1.
  • The cheapest Alaska flight from St. Louis to San Antonio is $828, flying from Jun 6 to Jun 8.
  • The cheapest Frontier flight from St. Louis to San Antonio is $180, flying from May 28 to May 31.
The cheapest round-trip flight from St. Louis to San Antonio starts at $180 from Thu, May 28 to Sun, May 31. The cheapest one-way flight starts at $96 and departs on Wed, May 27.
2 hr 5 min is the shortest flight time from St. Louis to San Antonio.
San Antonio has mild winters (Dec–Feb), and hot and humid summers (Jun–Sep). Summer, as well as warm spring (Mar–May) are the most popular times to visit. Remember the Alamo Weekend (Mar) sees reenactments of the battle. Fiesta San Antonio (Apr), a long-standing heritage festival, is a huge, 11-day party known for its flower parades, live music and food stands.
It's easy to use Google Flights to find the cheapest days to fly from St. Louis to San Antonio.
Just click the Departure label near the top of the page to open the calendar. Choose a start date and a return date to see how the round-trip fare changes on those specific days.
Adjust the trip type to see one-way fares. The cheapest available flights are highlighted and easy to spot. Once you settle on dates, click the Search button to see flight options and book the deal.

You can also turn on price tracking to get alerts if the price changes for a route or flight.
What counts as the best airline for your flights from St. Louis to San Antonio really depends on your individual needs. You may have a favorite carrier or a loyalty program you like, but price, convenience, and airports served also come into play. Flexibility and booking terms – Can you change flights if you want to stay longer or get a refund if you have to postpone your trip? – are also factors that help determine which airline is best to fly from St. Louis to San Antonio.

In terms of nonstop flights, Southwest is the most popular. Southwest offers 13 nonstop flights and 807 connecting flights per week. Southwest flies from St. Louis Lambert International Airport (STL) to San Antonio International Airport (SAT) .

Other popular airlines flying from St. Louis to San Antonio are:
  • American offers 476 connecting flights per week. American flies from St. Louis Lambert International Airport (STL) to San Antonio International Airport (SAT) .
  • United offers 239 connecting flights per week. United flies from St. Louis Lambert International Airport (STL) to San Antonio International Airport (SAT) .
  • Delta offers 222 connecting flights per week. Delta flies from St. Louis Lambert International Airport (STL) to San Antonio International Airport (SAT) .
  • Alaska offers 16 connecting flights per week. Alaska flies from St. Louis Lambert International Airport (STL) to San Antonio International Airport (SAT) .
  • Frontier offers 8 connecting flights per week. Frontier flies from St. Louis Lambert International Airport (STL) to San Antonio International Airport (SAT) .
The number of connecting flights refers to distinct flights with at least one stop between St. Louis and San Antonio.
The cheapest round-trip flight from St. Louis to San Antonio recently found on Google Flights was with Frontier from $180. The cheapest one-way flight was with Frontier from $96.

Some of the cheapest round-trip deals we found with different airlines:
  • The cheapest Southwest flight from St. Louis to San Antonio is $385, flying from Jun 4 to Jun 8.
  • The cheapest American flight from St. Louis to San Antonio is $400, flying from May 21 to May 24.
  • The cheapest United flight from St. Louis to San Antonio is $311, flying from May 28 to Jun 1.
  • The cheapest Delta flight from St. Louis to San Antonio is $395, flying from May 28 to Jun 1.
  • The cheapest Alaska flight from St. Louis to San Antonio is $828, flying from Jun 6 to Jun 8.
  • The cheapest Frontier flight from St. Louis to San Antonio is $180, flying from May 28 to May 31.
Southwest flies direct from St. Louis to San Antonio.
  • There are 13 Southwest direct flights from St. Louis to San Antonio per week. Flights are available every day.
Use the Stops filter while searching for flights, to see only nonstop options in your results.
The cheapest last-minute deal between St. Louis and San Antonio at price $236 is offered by Frontier from Thu, Apr 30 to Mon, May 4.
Southwest flies direct from St. Louis to San Antonio.
  • There are 13 Southwest direct flights from St. Louis to San Antonio per week. Flights are available every day.
Use the Stops filter while searching for flights, to see only nonstop options in your results.
There are direct flights from St. Louis to San Antonio on a daily basis.
The cheapest direct (nonstop) round-trip flights between St. Louis and San Antonio start at $385 from Thu, May 28 to Mon, Jun 1 with Southwest.
It's easy to find nonstop flights with Google Flights! Once you've searched for flights from St. Louis to San Antonio, just select the nonstop flights only option in the 'Stops’ filter in the search form and view all available direct flights and their prices.
The cheapest business class round-trip flights between St. Louis and San Antonio start at $448 from Fri, Jun 5 to Sun, Jun 7 with Frontier.
The cheapest economy class round-trip flights between St. Louis and San Antonio start at $180 from Thu, May 28 to Sun, May 31.
To book business class trips from St. Louis to San Antonio, look for the default Economy selection at the top, and change it to your desired cabin class such as Premium Economy, Business Class, or First Class. You can then select your departure and arrival dates, consider available options, and book your business travel.

You can also adjust the trip type to view one-way fares.
The best last-minute getaway deal for the next weekend between St. Louis and San Antonio starts at $236 from Thu, Apr 30 to Mon, May 4 with Frontier.
The cheapest last-minute deal between St. Louis and San Antonio at price $236 is offered by Frontier from Thu, Apr 30 to Mon, May 4.
To find last-minute flight deals from St. Louis to San Antonio, start by entering the city names, select the desired departure and return dates, and hit the Search button to view flight options.

You can check for last-minute flights for the same day or adjust the trip type to see one-way fares.

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