Are direct flights from San Antonio to St. Louis always the best option?

Direct flights offer convenience by reducing travel time and avoiding layovers. However, connecting flights can sometimes be more affordable, especially during peak travel periods. Consider your priorities for cost versus travel duration when making your choice.

Can flexible travel dates help on San Antonio to St. Louis flights?

Yes, having flexible travel dates can significantly increase your chances of finding cheaper flights. Prices often vary depending on the day of the week or specific dates. Adjusting your departure or return by a day or two may lead to better deals.

What extra costs should I check before booking San Antonio to St. Louis flights?

Before booking, always check for potential extra costs such as baggage fees, seat selection charges, and in-flight services. Some airlines may also charge for printing boarding passes at the airport. Understanding these fees helps you calculate the true total cost of your trip.

Flights From San Antonio

To St. Louis

Cheap Flights from San Antonio to St. Louis

Browse current best options from San Antonio. Become a member to unlock all deals and get alerts when new deals appear.

Deals from

San Antonio

RatePunk searches hundreds of travel sites at once for deals on flights to St. Louis

Prices updated 2 days ago

405 airlines compared

80%+ AI score for best value

Fares are subject to change and may not be available for all dates. (Data last updated Jul 26, 2026.)

Today’s best flight deals from San Antonio to St. Louis

Explore current cheapest deals departing from San Antonio to St. Louis

2026-08-12 – 2026-08-17
SAT - St. Louis
71% AI deal score
$313
$240
Round trip
2026-08-08 – 2026-08-10
SAT - St. Louis
72% AI deal score
$330
$240
Round trip
2026-08-10 – 2026-08-12
SAT - St. Louis
72% AI deal score
$329
$240
Round trip
2026-08-11 – 2026-08-12
SAT - St. Louis
72% AI deal score
$327
$240
Round trip
2026-08-17 – 2026-08-19
SAT - St. Louis
71% AI deal score
$320
$240
Round trip
2026-08-18 – 2026-08-24
SAT - St. Louis
66% AI deal score
$300
$240
Round trip
2026-09-21 – 2026-09-28
SAT - St. Louis
49% AI deal score
$287
$240
Round trip
2026-10-01 – 2026-10-05
SAT - St. Louis
65% AI deal score
$294
$240
Round trip
2026-10-15 – 2026-10-19
SAT - St. Louis
50% AI deal score
$297
$245
Round trip
2026-08-06 – 2026-08-09
SAT - St. Louis
49% AI deal score
$332
$281
Round trip

San Antonio to St. Louis: Overview

Insights for flights from San Antonio to St. Louis

A typical journey from San Antonio to St. Louis takes about 8h 44m, including connections. Since most itineraries on this route involve at least one stop, this duration reflects the overall travel time you can expect. This journey covers a distance of 1,266 kilometers, classifying it as a short-haul flight.

For those seeking cheap flights from San Antonio to St. Louis, fares typically range from $328–$412, with a median of $386. Right now, current fares are near the typical level for this route. Only 2% of recent fares were classified as a good price, indicating that finding significantly lower prices can be challenging.

When is the cheapest time to fly from San Antonio to St. Louis? The data indicates that March is the most affordable month, with a median fare of $164. Following March, January also offers competitive prices, with a median fare of $239. December presents a median fare of $332, making it a relatively more expensive option compared to the cheapest months.

Most itineraries for flights from San Antonio to St. Louis connect at least once, as 0% of recent fares were non-stop. When connections are necessary, the typical number of stopovers is 2. New deals for this route appear almost daily, suggesting frequent opportunities to find available flights, though direct options are not common.

How much is a round trip from San Antonio to St. Louis

Regular price: $251 - $357

Prices for flights from San Antonio to St. Louis are currently below the regular range.

The regular price range for this route is between $251 and $357. The current lowest deal is $239 with Frontier Airlines for travel from Aug 18-Aug 24.

now $239

Low $251

High $357

The cheapest time to fly from San Antonio to St. Louis

The cheapest month to fly from San Antonio to St. Louis is March, with a median price of $164. The most expensive month is October, with a median price of $414. Prices are generally lower from January to December.

March

Cheapest

Flights from $164

October

Most Expensive

Flights from $414

Jan

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Direct flights from San Antonio to St. Louis

Southwest Airlines

Last-minute flights going from San Antonio to St. Louis

Fri, Aug 7

⌛ Last-Minute

SAT - St. Louis

San Antonio (SAT) - St. Louis (STL)

Frontier Airlines

$374

$360

One-way

Fri, Aug 7

⌛ Last-Minute

SAT - St. Louis

San Antonio (SAT) - St. Louis (STL)

Frontier Airlines

$374

$360

One-way

Tue, Aug 11

⌛ Last-Minute

SAT - St. Louis

San Antonio (SAT) - St. Louis (STL)

Frontier Airlines

$304

$239

One-way

Tue, Aug 11

⌛ Last-Minute

SAT - St. Louis

San Antonio (SAT) - St. Louis (STL)

Frontier Airlines

$315

$346

One-way

Thu, Aug 13

⌛ Last-Minute

SAT - St. Louis

San Antonio (SAT) - St. Louis (STL)

Frontier Airlines

$332

$239

One-way

Thu, Aug 13

⌛ Last-Minute

SAT - St. Louis

San Antonio (SAT) - St. Louis (STL)

Frontier Airlines

$332

$346

One-way

Biggest price drops on these dates for flights from San Antonio to St. Louis

4 nights

Aug 13 - Aug 17

$332 → $239

28%

6 nights

Aug 11 - Aug 17

$304 → $239

21%

6 nights

Aug 18 - Aug 24

$302 → $239

21%

4 nights

Oct 1 - Oct 5

$294 → $239

19%

Popular Airports to fly from San Antonio to St. Louis

San Antonio - St. Louis route insights

💸 Price insights

Recent fares are near the typical level.

Recent fares for San Antonio to St. Louis are near the typical level of $386.

📅 Best time to fly

March is historically the cheapest month to fly.

Historically, March is the cheapest month to fly from San Antonio to St. Louis, with a median price of $164.

⏱️ Flight duration

Flights typically take 8h 44m.

The typical flight duration from San Antonio to St. Louis is 8 hours and 44 minutes.

✈️ Airlines & availability

Connecting flights are dominant for this route.

Connecting flights are dominant for this route, with a median of 2 stopovers.

🏆 Airline highlight

Frontier Airlines offers a recent deal.

A recent deal from Frontier Airlines was found for $239 from August 18-August 24.

🎯 Booking tip

Deals appear frequently on this route.

Deals for flights from San Antonio to St. Louis appear frequently, typically every 30 days.

San Antonio main airports to depart from

San Antonio International (SAT)

Cheapest

San Antonio International Airport is a convenient departure point for flights to St. Louis.

📍 ~15 km from city center (reachable by car)

💸 Flights from ~$244

St. Louis main airports to arrive at

St. Louis Lambert International (STL)

Cheapest

St. Louis Lambert International Airport is the primary airport for arrivals into St. Louis.

📍 ~20 km from St. Louis (reachable by car)

💸 Flights from ~$244

Airports nearby St. Louis used as alternative

MidAmerica St. Louis (BLV)

MidAmerica St. Louis is the closest alternative, especially useful for travelers on the Illinois side of the metro area.

📍 ~45 km from St. Louis (reachable by car)

💸 Flights from ~$343

Business & First Class Flight Deals to St. Louis

79% AI deal score

$1,603

$693

Save $910

Frequently Asked Questions About Flights to St. Louis

To find more affordable flights, consider being flexible with your travel dates and times. Comparing prices from various airlines and booking sites can often reveal better deals. Setting up price alerts can also help you track fare changes and book when prices drop.

Booking flights in advance, often several weeks or months before your intended travel date, can sometimes result in lower prices. However, prices can fluctuate, so monitoring fares is usually a good strategy. Mid-week bookings may also offer different pricing.

Comparing nearby airports at both your origin and destination can sometimes uncover more economical flight options. While it may involve additional ground transportation, the savings on airfare can occasionally be significant. Always factor in the total cost and travel time.

Related routes

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Flights to St. Louis from other cities

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San Antonio to St. Louis: Overview

Insights for flights from San Antonio to St. Louis

How much is a round trip from San Antonio to St. Louis

Regular price: $251 - $357

Prices for flights from San Antonio to St. Louis are currently below the regular range.

The regular price range for this route is between $251 and $357. The current lowest deal is $239 with Frontier Airlines for travel from Aug 18-Aug 24.

now $239

Low $251

High $357

The cheapest time to fly from San Antonio to St. Louis

March

Cheapest

Flights from $164

October

Most Expensive

Flights from $414

Jan

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Direct flights from San Antonio to St. Louis

Southwest Airlines

Last-minute flights going from San Antonio to St. Louis

Fri, Aug 7

⌛ Last-Minute

SAT - St. Louis

San Antonio (SAT) - St. Louis (STL)

Frontier Airlines

$374

$360

One-way

Fri, Aug 7

⌛ Last-Minute

SAT - St. Louis

San Antonio (SAT) - St. Louis (STL)

Frontier Airlines

$374

$360

One-way

Tue, Aug 11

⌛ Last-Minute

SAT - St. Louis

San Antonio (SAT) - St. Louis (STL)

Frontier Airlines

$304

$239

One-way

Tue, Aug 11

⌛ Last-Minute

SAT - St. Louis

San Antonio (SAT) - St. Louis (STL)

Frontier Airlines

$315

$346

One-way

Thu, Aug 13

⌛ Last-Minute

SAT - St. Louis

San Antonio (SAT) - St. Louis (STL)

Frontier Airlines

$332

$239

One-way

Thu, Aug 13

⌛ Last-Minute

SAT - St. Louis

San Antonio (SAT) - St. Louis (STL)

Frontier Airlines

$332

$346

One-way

Biggest price drops on these dates for flights from San Antonio to St. Louis

4 nights

Aug 13 - Aug 17

$332 → $239

28%

6 nights

Aug 11 - Aug 17

$304 → $239

21%

6 nights

Aug 18 - Aug 24

$302 → $239

21%

4 nights

Oct 1 - Oct 5

$294 → $239

19%

Popular Airports to fly from San Antonio to St. Louis