$76+ Cheap flights from San Antonio to St. Louis (SAT - STL)

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

Highest demand for flights based on searches. 17% potential increase in price ($72 potential increase over avg. RT price).

Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).

Average for round-trip flights in September 2025

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

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

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 septiembre 16, 2025.

lun. 9/298:20 pmSAT - STL

1 stop12h 46mFrontier

vie. 10/37:55 pmSTL - SAT

1 stop18h 32mFrontier

Deal found 9/14

$143

jue. 12/48:28 amSAT - STL

1 stop4h 04mAmerican Airlines

lun. 12/85:58 pmSTL - SAT

1 stop6h 27mAmerican Airlines

Deal found 9/14

$159

jue. 9/259:33 pmSAT - STL

1 stop16h 20mFrontier

vie. 9/267:55 pmSTL - SAT

1 stop18h 32mFrontier

Deal found 9/16

$164

vie. 10/37:25 pmSAT - STL

1 stop13h 41mFrontier

dom. 10/57:55 pmSTL - SAT

1 stop23h 20mFrontier

Deal found 9/15

$168

dom. 10/59:55 amSAT - STL

1 stop23h 11mFrontier

mié. 10/87:52 pmSTL - SAT

1 stop15h 22mFrontier

Deal found 9/16

$180

vie. 10/107:10 pmSAT - STL

1 stop20h 28mFrontier

dom. 10/1211:32 amSTL - SAT

1 stop5h 20mFrontier

Deal found 9/14

$191

dom. 9/289:55 amSAT - STL

1 stop23h 11mFrontier

dom. 10/1211:32 amSTL - SAT

1 stop5h 20mFrontier

Deal found 9/15

$202

mar. 10/146:45 amSAT - STL

1 stop7h 42mUnited Airlines

jue. 10/166:15 amSTL - SAT

1 stop7h 00mUnited Airlines

Deal found 9/15

$213

vie. 10/1710:54 amSAT - STL

1 stop11h 20mMultiple Airlines

dom. 10/1910:57 amSTL - SAT

1 stop7h 33mMultiple Airlines

Deal found 9/15

$220

dom. 10/128:26 pmSAT - STL

1 stop12h 41mFrontier

dom. 10/192:47 pmSTL - SAT

1 stop22h 32mFrontier

Deal found 9/15

$222

jue. 10/29:33 pmSAT - STL

2 stops11h 33mFrontier

sáb. 10/44:58 pmSTL - SAT

2 stops16h 12mFrontier

Deal found 9/14

$229

mié. 11/265:20 amSAT - STL

1 stop5h 20mSouthwest

mar. 12/25:45 amSTL - SAT

1 stop4h 10mSouthwest

Deal found 9/16

$259

Best flights from San Antonio to St. Louis
Discover carefully curated flight deals from San Antonio to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated septiembre 16, 2025.

lun. 9/298:20 pmSAT - STL

1 stop12h 46mFrontier

vie. 10/37:55 pmSTL - SAT

1 stop18h 32mFrontier

Deal found 9/14

$143

jue. 12/48:28 amSAT - STL

1 stop4h 04mAmerican Airlines

lun. 12/85:58 pmSTL - SAT

1 stop6h 27mAmerican Airlines

Deal found 9/14

$159

mar. 10/146:45 amSAT - STL

1 stop7h 42mUnited Airlines

jue. 10/166:15 amSTL - SAT

1 stop7h 00mUnited Airlines

Deal found 9/15

$213

vie. 10/1710:54 amSAT - STL

1 stop11h 20mMultiple Airlines

dom. 10/1910:57 amSTL - SAT

1 stop7h 33mMultiple Airlines

Deal found 9/15

$220

jue. 12/41:05 pmSAT - STL

1 stop4h 52mDelta

lun. 12/87:02 pmSTL - SAT

1 stop5h 31mDelta

Deal found 9/16

$279

lun. 9/298:20 pmSAT - STL

1 stop12h 46mFrontier

mié. 10/17:55 pmSTL - SAT

1 stop23h 20mFrontier

Deal found 9/14

$143

dom. 10/59:55 amSAT - STL

1 stop23h 11mFrontier

mié. 10/87:52 pmSTL - SAT

1 stop15h 22mFrontier

Deal found 9/16

$180

sáb. 12/205:59 pmSAT - STL

1 stop3h 56mUnited Airlines

dom. 1/46:00 amSTL - SAT

1 stop7h 13mUnited Airlines

Deal found 9/14

$274

jue. 10/29:33 pmSAT - STL

2 stops11h 33mFrontier

sáb. 10/44:58 pmSTL - SAT

2 stops16h 12mFrontier

Deal found 9/14

$229

mar. 10/147:00 amSAT - STL

2 stops26h 07mMultiple Airlines

jue. 10/1610:57 amSTL - SAT

1 stop7h 33mMultiple Airlines

Deal found 9/15

$284

jue. 12/45:20 amSAT - STL

2 stops9h 03mUnited Airlines

lun. 12/83:19 pmSTL - SAT

1 stop7h 41mUnited Airlines

Deal found 9/14

$290

Last-minute flights from San Antonio to St. Louis
Discover last-minute flight deals from San Antonio to St. Louis. Data last updated septiembre 16, 2025 and is based on user searches.

jue. 9/259:33 pmSAT - STL

1 stop16h 20mFrontier

vie. 9/267:55 pmSTL - SAT

1 stop18h 32mFrontier

Deal found 9/16

$164

dom. 9/289:55 amSAT - STL

1 stop23h 11mFrontier

dom. 10/1211:32 amSTL - SAT

1 stop5h 20mFrontier

Deal found 9/15

$202

lun. 9/298:20 pmSAT - STL

1 stop12h 46mFrontier

vie. 10/37:55 pmSTL - SAT

1 stop18h 32mFrontier

Deal found 9/14

$143

jue. 10/29:33 pmSAT - STL

2 stops11h 33mFrontier

sáb. 10/44:58 pmSTL - SAT

2 stops16h 12mFrontier

Deal found 9/14

$229

vie. 10/37:25 pmSAT - STL

1 stop13h 41mFrontier

dom. 10/57:55 pmSTL - SAT

1 stop23h 20mFrontier

Deal found 9/15

$168

dom. 10/59:55 amSAT - STL

1 stop23h 11mFrontier

mié. 10/87:52 pmSTL - SAT

1 stop15h 22mFrontier

Deal found 9/16

$180

vie. 10/107:10 pmSAT - STL

1 stop20h 28mFrontier

dom. 10/1211:32 amSTL - SAT

1 stop5h 20mFrontier

Deal found 9/14

$191

dom. 10/128:26 pmSAT - STL

1 stop12h 41mFrontier

dom. 10/192:47 pmSTL - SAT

1 stop22h 32mFrontier

Deal found 9/15

$222

mar. 10/146:24 pmSAT - STL

1 stop5h 30mAmerican Airlines

mié. 10/226:00 amSTL - SAT

1 stop6h 52mAmerican Airlines

Deal found 9/14

$159

mar. 10/146:45 amSAT - STL

1 stop7h 42mUnited Airlines

jue. 10/166:15 amSTL - SAT

1 stop7h 00mUnited Airlines

Deal found 9/15

$213

vie. 10/1710:54 amSAT - STL

1 stop11h 20mMultiple Airlines

dom. 10/1910:57 amSTL - SAT

1 stop7h 33mMultiple Airlines

Deal found 9/15

$220

dom. 10/267:00 amSAT - STL

2 stops36h 26mMultiple Airlines

jue. 10/308:40 pmSTL - SAT

1 stop22h 50mMultiple Airlines

Deal found 9/16

$261

One-way flights from San Antonio to St. Louis
Search for one-way flight options from San Antonio to St. Louis. Find affordable one-way fares based on user searches. Data last updated septiembre 16, 2025.

mar. 10/215:56 pmSAT - STL

1 stop4h 04mUnited Airlines

Deal found 9/14

$76

mar. 1/611:00 amSAT - STL

1 stop5h 14mAmerican Airlines

Deal found 9/14

$79

jue. 10/306:05 amSAT - STL

1 stop7h 39mAmerican Airlines

Deal found 9/14

$80

dom. 12/75:20 amSAT - STL

2 stops6h 55mUnited Airlines

Deal found 9/15

$81

lun. 10/2010:54 amSAT - STL

1 stop8h 32mFrontier

Deal found 9/13

$82

lun. 10/1310:54 amSAT - STL

1 stop8h 32mFrontier

Deal found 9/15

$87

vie. 10/1710:54 amSAT - STL

1 stop11h 20mFrontier

Deal found 9/13

$88

sáb. 11/153:12 pmSAT - STL

1 stop17h 55mFrontier

Deal found 9/13

$91

mié. 10/156:41 amSAT - STL

1 stop5h 54mDelta

Deal found 9/15

$99

vie. 10/107:10 pmSAT - STL

1 stop20h 28mFrontier

Deal found 9/14

$103

sáb. 12/275:59 pmSAT - STL

1 stop3h 56mUnited Airlines

Deal found 9/14

$105

dom. 10/126:45 amSAT - STL

1 stop7h 42mUnited Airlines

Deal found 9/15

$111

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

lun. 9/29

8:20 pm-9:06 am

1 stop12h 46m

Lambert-St Louis

vie. 10/3

7:55 pm-2:27 pm

1 stop18h 32m

$143

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

lun. 9/29

8:20 pm-9:06 am

1 stop12h 46m

Lambert-St Louis

mié. 10/1

7:55 pm-7:15 pm

1 stop23h 20m

$143

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

jue. 12/4

8:28 am-12:32 pm

1 stop4h 04m

Lambert-St Louis

lun. 12/8

5:58 pm-12:25 am

1 stop6h 27m

$159

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

dom. 10/5

9:55 am-9:06 am

1 stop23h 11m

Lambert-St Louis

mié. 10/8

7:52 pm-11:14 am

1 stop15h 22m

$180

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

mar. 10/14

6:45 am-2:27 pm

1 stop7h 42m

Lambert-St Louis

jue. 10/16

6:15 am-1:15 pm

1 stop7h 00m

$213

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

vie. 10/17

10:54 am-10:14 pm

1 stop11h 20m

Lambert-St Louis

dom. 10/19

10:57 am-6:30 pm

1 stop7h 33m

$220

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

jue. 10/2

9:33 pm-9:06 am

2 stops11h 33m

Lambert-St Louis

sáb. 10/4

4:58 pm-9:10 am

2 stops16h 12m

$229

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

sáb. 12/20

5:59 pm-9:55 pm

1 stop3h 56m

Lambert-St Louis

dom. 1/4

6:00 am-1:13 pm

1 stop7h 13m

$274

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

jue. 12/4

1:05 pm-5:57 pm

1 stop4h 52m

Lambert-St Louis

lun. 12/8

7:02 pm-12:33 am

1 stop5h 31m

$279

San AntonioSt. Louis

SAT - STL

SATSTL

San Antonio

mar. 10/14

7:00 am-9:07 am

2 stops26h 07m

Lambert-St Louis

jue. 10/16

10:57 am-6:30 pm

1 stop7h 33m

$284

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 22 results

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

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.

STL

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

Our travel experts

Ramsey Qubein

Expert on SAT

Taryn White

Expert on STL

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?

To ensure you get the cheapest price possible for a flight from San Antonio to St. Louis, you should look to book at least 82 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?

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?

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

Reviews of airlines servicing St. Louis

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.

8.0

Very good

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.

8.0

Very good

8.0

Very good

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

7,957 reviews

8.0

Very good

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

8,924 reviews

8.0

Very good

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

8.0

Very good

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

3,174 reviews

8.0

Very good