$99+ Flights from St. Louis to San Antonio

One-way flight from Lambert-St Louis to San Antonio

Highest demand for flights based on searches. 0% potential increase in price ($3 potential increase over avg. RT price).

Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).

Average for round-trip flights in June 2025

Price to beat on a round-trip flight from Lambert-St Louis to San Antonio.

Price to beat on a one-way flight from Lambert-St Louis to San Antonio.

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 June 12, 2025.

Mon 9/87:10 pmSTL - SAT

Nonstop2h 05mSouthwest

Thu 9/114:30 pmSAT - STL

Nonstop2h 10mSouthwest

Deal found 6/11

$197

Tue 7/15:37 amSTL - SAT

1 stop3h 35mAmerican Airlines

Sat 7/57:35 pmSAT - STL

1 stop4h 39mAmerican Airlines

Deal found 6/10

$199

Tue 10/145:28 pmSTL - SAT

1 stop5h 26mUnited Airlines

Tue 10/215:56 pmSAT - STL

1 stop4h 03mUnited Airlines

Deal found 6/10

$217

Mon 6/307:13 pmSTL - SAT

2 stops16h 24mSpirit Airlines

Wed 7/212:32 pmSAT - STL

2 stops28h 32mSpirit Airlines

Deal found 6/10

$232

Mon 10/135:40 pmSTL - SAT

1 stop6h 45mDelta

Tue 10/216:45 amSAT - STL

1 stop5h 40mDelta

Deal found 6/10

$239

Thu 7/105:26 pmSTL - SAT

1 stop7h 08mMultiple Airlines

Fri 7/115:38 pmSAT - STL

1 stop20h 21mMultiple Airlines

Deal found 6/11

$247

Fri 6/137:29 pmSTL - SAT

1 stop22h 34mFrontier

Sun 6/158:12 pmSAT - STL

1 stop13h 00mFrontier

Deal found 6/11

$345

Best flights from St. Louis to San Antonio
Discover carefully curated flight deals from St. Louis to San Antonio that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 12, 2025.

Mon 9/87:10 pmSTL - SAT

Nonstop2h 05mSouthwest

Thu 9/114:30 pmSAT - STL

Nonstop2h 10mSouthwest

Deal found 6/11

$197

Tue 7/15:37 amSTL - SAT

1 stop3h 35mAmerican Airlines

Sat 7/57:35 pmSAT - STL

1 stop4h 39mAmerican Airlines

Deal found 6/10

$199

Sun 8/246:15 amSTL - SAT

1 stop4h 22mUnited Airlines

Thu 8/284:22 pmSAT - STL

1 stop5h 46mUnited Airlines

Deal found 6/11

$228

Mon 6/307:13 pmSTL - SAT

2 stops16h 24mSpirit Airlines

Wed 7/212:32 pmSAT - STL

2 stops28h 32mSpirit Airlines

Deal found 6/10

$232

Thu 7/105:26 pmSTL - SAT

1 stop7h 08mMultiple Airlines

Fri 7/115:38 pmSAT - STL

1 stop20h 21mMultiple Airlines

Deal found 6/11

$247

Mon 7/147:11 pmSTL - SAT

1 stop5h 03mDelta

Thu 7/176:11 pmSAT - STL

1 stop5h 42mDelta

Deal found 6/9

$294

Thu 6/262:36 pmSTL - SAT

1 stop26h 07mFrontier

Mon 6/308:50 amSAT - STL

1 stop15h 03mFrontier

Deal found 6/11

$364

Thu 6/266:41 amSTL - SAT

2 stops16h 18mAlaska Airlines

Mon 6/307:37 pmSAT - STL

1 stop28h 22mAlaska Airlines

Deal found 6/11

$1,089

Last-minute flights from St. Louis to San Antonio
Discover last-minute flight deals from St. Louis to San Antonio. Data last updated June 12, 2025 and is based on user searches.

Fri 6/137:29 pmSTL - SAT

1 stop22h 34mFrontier

Sun 6/158:12 pmSAT - STL

1 stop13h 00mFrontier

Deal found 6/11

$345

Tue 6/177:20 amSTL - SAT

1 stop5h 14mAmerican Airlines

Wed 6/185:00 amSAT - STL

1 stop4h 18mAmerican Airlines

Deal found 6/11

$513

Tue 6/175:10 amSTL - SAT

1 stop6h 10mSouthwest

Wed 6/185:55 amSAT - STL

2 stops5h 50mSouthwest

Deal found 6/11

$718

Wed 6/187:29 pmSTL - SAT

1 stop23h 45mFrontier

Fri 6/2010:16 amSAT - STL

1 stop13h 37mFrontier

Deal found 6/12

$367

Thu 6/196:36 pmSTL - SAT

1 stop26h 51mMultiple Airlines

Sat 6/212:55 pmSAT - STL

1 stop22h 47mMultiple Airlines

Deal found 6/9

$525

Thu 6/199:10 amSTL - SAT

1 stop7h 44mUnited Airlines

Sat 6/217:43 amSAT - STL

2 stops7h 47mUnited Airlines

Deal found 6/9

$754

Mon 6/307:13 pmSTL - SAT

2 stops16h 24mSpirit Airlines

Wed 7/212:32 pmSAT - STL

2 stops28h 32mSpirit Airlines

Deal found 6/10

$232

Tue 7/15:37 amSTL - SAT

1 stop3h 35mAmerican Airlines

Sat 7/57:35 pmSAT - STL

1 stop4h 39mAmerican Airlines

Deal found 6/10

$199

Thu 7/35:00 amSTL - SAT

1 stop6h 45mUnited Airlines

Sat 7/56:40 amSAT - STL

1 stop6h 06mUnited Airlines

Deal found 6/11

$239

Thu 7/105:26 pmSTL - SAT

1 stop7h 08mMultiple Airlines

Fri 7/115:38 pmSAT - STL

1 stop20h 21mMultiple Airlines

Deal found 6/11

$247

Thu 7/109:27 amSTL - SAT

1 stop7h 39mDelta

Thu 7/176:11 pmSAT - STL

1 stop5h 42mDelta

Deal found 6/12

$249

Tue 7/1510:05 amSTL - SAT

1 stop5h 55mSouthwest

Wed 7/235:55 amSAT - STL

2 stops5h 50mSouthwest

Deal found 6/10

$302

One-way flights from St. Louis to San Antonio
Search for one-way flight options from St. Louis to San Antonio. Find affordable one-way fares based on user searches. Data last updated June 12, 2025.

Mon 9/87:10 pmSTL - SAT

Nonstop2h 05mSouthwest

Deal found 6/10

$99

Sat 7/265:30 amSTL - SAT

1 stop3h 43mAmerican Airlines

Deal found 6/10

$100

Thu 8/216:15 amSTL - SAT

1 stop4h 22mUnited Airlines

Deal found 6/10

$104

Sat 7/1210:45 amSTL - SAT

1 stop8h 37mSpirit Airlines

Deal found 6/10

$108

Thu 7/39:50 amSTL - SAT

2 stops7h 28mMultiple Airlines

Deal found 6/11

$138

Sun 7/272:36 pmSTL - SAT

1 stop26h 16mFrontier

Deal found 6/10

$143

Sun 7/206:05 amSTL - SAT

1 stop27h 42mSun Country Air

Deal found 6/9

$144

Wed 6/256:00 amSTL - SAT

1 stop7h 54mDelta

Deal found 6/9

$240

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to San Antonio that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Mon 9/8

7:10 pm-9:15 pm

Nonstop2h 05m

San Antonio

Thu 9/11

4:30 pm-6:40 pm

Nonstop2h 10m

$197

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Tue 7/1

5:37 am-9:12 am

1 stop3h 35m

San Antonio

Sat 7/5

7:35 pm-12:14 am

1 stop4h 39m

$199

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Sun 8/24

6:15 am-10:37 am

1 stop4h 22m

San Antonio

Thu 8/28

4:22 pm-10:08 pm

1 stop5h 46m

$228

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Mon 6/30

7:13 pm-11:37 am

2 stops16h 24m

San Antonio

Wed 7/2

12:32 pm-5:04 pm

2 stops28h 32m

$232

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Thu 7/10

5:26 pm-12:34 am

1 stop7h 08m

San Antonio

Fri 7/11

5:38 pm-1:59 pm

1 stop20h 21m

$247

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Thu 7/10

9:27 am-5:06 pm

1 stop7h 39m

San Antonio

Thu 7/17

6:11 pm-11:53 pm

1 stop5h 42m

$249

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Thu 6/26

2:36 pm-4:43 pm

1 stop26h 07m

San Antonio

Mon 6/30

8:50 am-11:53 pm

1 stop15h 03m

$364

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Mon 8/4

7:15 pm-9:20 pm

Nonstop2h 05m

$99

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Sat 7/26

5:30 am-9:13 am

1 stop3h 43m

$100

St. LouisSan Antonio

STL - SAT

STLSAT

Lambert-St Louis

Thu 8/21

6:15 am-10:37 am

1 stop4h 22m

$104

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 15 results

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?

Booking 48 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?

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 in the afternoon, which can drop the price by up to 16% versus a flight in the evening.

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

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. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in San Antonio 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

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

Peruse reviews from past customers who have flown with Alaska Airlines, Southwest 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.

8.0

Very good

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

8.0

Very good

8.0

Very good

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Southwest

8.0

Very good

4,287 reviews

8.0

Very good

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Delta

8.0

Very good

7,950 reviews

8.0

Very good

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

United Airlines

7.4

Good

8,790 reviews

8.0

Very good

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

American Airlines

7.2

Good

8.0

Very good