Cheap flights from St. Louis to Austin from $69

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Austin departing on 10/22. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

Southwest Logo
12:45 pm - 2:50 pmSTL-AUS
2h 05mnonstop
Southwest Logo
6:00 am - 8:05 amAUS-STL
2h 05mnonstop
$137Southwest
Find Deal
Wed, Oct 15 - Wed, Oct 22
Southwest Logo
6:05 pm - 10:40 pmSTL-AUS
4h 35m1 stop
Southwest Logo
6:00 am - 8:05 amAUS-STL
2h 05mnonstop
$147Southwest
Find Deal
Wed, Oct 15 - Wed, Oct 22
United Airlines Logo
5:00 am - 10:08 amSTL-AUS
5h 08m1 stop
United Airlines Logo
4:18 pm - 10:00 pmAUS-STL
5h 42m1 stop
$151United Airlines
Find Deal
Thu, Oct 9 - Mon, Oct 13
American Airlines Logo
11:58 am - 3:50 pmSTL-AUS
3h 52m1 stop
American Airlines Logo
3:46 pm - 11:32 pmAUS-STL
7h 46m1 stop
$159American Airlines
Find Deal
Thu, Jan 29 - Mon, Feb 2
Frontier Logo
11:07 am - 5:01 pmSTL-AUS
5h 54m1 stop
Frontier Logo
5:56 pm - 9:40 amAUS-STL
15h 44m2 stops
$186Frontier
Find Deal
Thu, Nov 6 - Sun, Nov 16
Frontier Logo
2:38 pm - 10:04 pmSTL-AUS
7h 26m1 stop
Frontier Logo
9:23 pm - 9:06 amAUS-STL
11h 43m1 stop
$195Frontier
Find Deal
Mon, Sep 29 - Fri, Oct 3
Delta Logo
7:30 am - 12:56 pmSTL-AUS
5h 26m1 stop
Delta Logo
6:00 pm - 11:10 pmAUS-STL
5h 10m1 stop
$197Delta
Find Deal
Tue, Jan 20 - Wed, Jan 28
United Airlines Logo
4:50 pm - 11:59 pmSTL-AUS
7h 09m1 stop
United Airlines Logo
4:18 pm - 10:00 pmAUS-STL
5h 42m1 stop
$209United Airlines
Find Deal
Fri, Oct 10 - Mon, Oct 13
American Airlines Logo
5:54 pm - 11:02 pmSTL-AUS
5h 08m1 stop
American Airlines Logo
6:00 am - 9:57 amAUS-STL
3h 57m1 stop
$229American Airlines
Find Deal
Mon, Jan 19 - Sun, Jan 25
Delta Logo
10:00 am - 4:19 pmSTL-AUS
6h 19m1 stop
Delta Logo
6:00 pm - 11:10 pmAUS-STL
5h 10m1 stop
$253Delta
Find Deal
Mon, Feb 9 - Tue, Feb 17

Southwest flights from St. Louis to Austin

Our best Southwest deals on St. Louis to Austin flight tickets
Southwest
Oct 15
STL12:45 pmLambert-St Louis
2h 05m
AUS2:50 pmAustin Bergstrom
Oct 22
AUS6:00 amAustin Bergstrom
2h 05m
STL8:05 amLambert-St Louis
Southwest
Oct 15
STL6:05 pmLambert-St Louis
4h 35m
1 stop
AUS10:40 pmAustin Bergstrom
Oct 22
AUS6:00 amAustin Bergstrom
2h 05m
STL8:05 amLambert-St Louis
Southwest
Oct 15
STL6:30 amLambert-St Louis
5h 20m
1 stop
AUS11:50 amAustin Bergstrom
Oct 22
AUS8:05 amAustin Bergstrom
6h 15m
1 stop
STL2:20 pmLambert-St Louis

Frontier flights from St. Louis to Austin

Our best Frontier deals on St. Louis to Austin flight tickets
Frontier
Sep 26
STL9:35 pmLambert-St Louis
17h 52m
1 stop
AUS3:27 pmAustin Bergstrom
Sep 28
AUS9:23 pmAustin Bergstrom
11h 43m
1 stop
STL9:06 amLambert-St Louis
Frontier
Nov 6
STL11:07 amLambert-St Louis
5h 54m
1 stop
AUS5:01 pmAustin Bergstrom
Nov 16
AUS5:56 pmAustin Bergstrom
15h 44m
2 stops
STL9:40 amLambert-St Louis
Frontier
Sep 29
STL2:38 pmLambert-St Louis
7h 26m
1 stop
AUS10:04 pmAustin Bergstrom
Oct 3
AUS9:23 pmAustin Bergstrom
11h 43m
1 stop
STL9:06 amLambert-St Louis

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Austin 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, momondo users made 832,500 searches. Data last updated September 16, 2025.
Use the filters below to find and compare flights from St. Louis to Austin that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Wed 10/15

12:45 pm-2:50 pm

Nonstop2h 05m

Austin Bergstrom

Wed 10/22

6:00 am-8:05 am

Nonstop2h 05m

$137

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Wed 10/15

6:05 pm-10:40 pm

1 stop4h 35m

Austin Bergstrom

Wed 10/22

6:00 am-8:05 am

Nonstop2h 05m

$147

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Thu 10/9

5:00 am-10:08 am

1 stop5h 08m

Austin Bergstrom

Mon 10/13

4:18 pm-10:00 pm

1 stop5h 42m

$151

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Thu 1/29

11:58 am-3:50 pm

1 stop3h 52m

Austin Bergstrom

Mon 2/2

3:46 pm-11:32 pm

1 stop7h 46m

$159

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Thu 11/6

11:07 am-5:01 pm

1 stop5h 54m

Austin Bergstrom

Sun 11/16

5:56 pm-9:40 am

2 stops15h 44m

$186

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Mon 9/29

2:38 pm-10:04 pm

1 stop7h 26m

Austin Bergstrom

Fri 10/3

9:23 pm-9:06 am

1 stop11h 43m

$195

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Tue 1/20

7:30 am-12:56 pm

1 stop5h 26m

Austin Bergstrom

Wed 1/28

6:00 pm-11:10 pm

1 stop5h 10m

$197

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Fri 10/10

4:50 pm-11:59 pm

1 stop7h 09m

Austin Bergstrom

Mon 10/13

4:18 pm-10:00 pm

1 stop5h 42m

$209

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Mon 1/19

5:54 pm-11:02 pm

1 stop5h 08m

Austin Bergstrom

Sun 1/25

6:00 am-9:57 am

1 stop3h 57m

$229

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Mon 2/9

10:00 am-4:19 pm

1 stop6h 19m

Austin Bergstrom

Tue 2/17

6:00 pm-11:10 pm

1 stop5h 10m

$253

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Austin from

How to get the cheapest flight ticket from St. Louis to Austin

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Austin?

The cheapest month to fly to Austin from St. Louis is in September. Flight prices, which tend to average around $248, are often lower during this time because this is during the off-season. If you’re not able to fly to Austin in September, then August is your next best option. Flight prices from St. Louis to Austin during August average around $251.

What is the cheapest day to depart on your flight to Austin?

The cheapest day to depart on your flight to Austin is on a Wednesday when prices can be found for as low as $326. This is often the case because there is less demand to fly during this day of the week. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from St. Louis to Austin for around $395.

What is the cheapest time of day to depart on your flight to Austin?

In the morning is the cheapest time of day to fly from St. Louis to Austin when you can find flight prices for as low as $344. Flying to Austin in the morning is an ideal time because this is during off-peak travel hours. Flights to Austin are more costly in the afternoon, with an average ticket price of $364. Departure times in the afternoon fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Lambert-St Louis to Austin Bergstrom flight route?

Fly from Lambert-St Louis to Austin Bergstrom for the best Lambert-St Louis - Austin Bergstrom flight prices

How far in advance should I book a flight to Austin?

You are more likely to see cheaper flights to Austin from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Austin for around $308 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Austin from St. Louis for as low as $264 on momondo.

What cabin class options are available on Lambert-St Louis to Austin Bergstrom flights?

There is only 1 cabin class available to choose from on Lambert-St Louis to Austin Bergstrom flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on St. Louis to Austin flights?

No. A direct flight is the cheapest option for a flight between St. Louis to Austin.

How have St. Louis to Austin flight prices changed over time?

As of September 2025, prices for St. Louis to Austin flights are approximately 46% more expensive when compared to flights at the same time last year.

When to book flights from St. Louis to Austin

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Austin according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Austin (STL to AUS) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Austin

Best Price Found

$209

Fastest flight time

2h 00m

Direct flights

Mon, Tue, Thu, Fri, Sat and Sun

Airports in Austin

1 airport
The best one-way flight to Austin from St. Louis in the past 72 hours is $209. The best round-trip flight deal from St. Louis to Austin found on momondo in the last 72 hours is $198.
The fastest flight from St. Louis to Austin takes 2h 00m
Direct flights go from St. Louis to Austin on Monday, Tuesday, Thursday, Friday, Saturday and Sunday. There are no airlines offering direct flights.
There is 1 airport near Austin: Austin Bergstrom (AUS)
  • How far is Lambert-St Louis to Austin Bergstrom by plane?

    The straight-line distance from Lambert-St Louis to Austin Bergstrom is 718.3 mi. Flights usually cover this in 2h 00m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Austin Bergstrom Airport?

    Prices for flights from Lambert-St Louis Airport to Austin Bergstrom Airport refresh daily.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Austin Bergstrom Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Austin Bergstrom Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Austin Bergstrom Airport.

  • What documentation or ID do you need to fly to Austin Bergstrom Airport?

    The travel and health documents required for your trip to Austin Bergstrom Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Austin Bergstrom Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from St. Louis to Austin?

  • What is the most popular airline from St. Louis to Austin?

Best airlines flying from St. Louis to Austin

Compare and see reviews for airlines that fly from St. Louis to Austin with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $98Free CancellationRating
7.9
7,954 reviews
Search Delta flights
FrontierPriceFrom $135Free CancellationRating
5.8
3,172 reviews
Search Frontier flights
American AirlinesPriceFrom $183Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $208Free CancellationRating
8.0
4,242 reviews
Search Southwest flights
United AirlinesPriceFrom $208Free CancellationRating
7.4
8,929 reviews
Search United Airlines flights
  • Southwest Flights From St. Louis to Austin

    Southwest flight deals from St. Louis to Austin start from $208 round-trip. Over the 13 Southwest flights for this route in a normal week, average airfare is usually $334 round-trip - but some users have found much cheaper deals with momondo.

Traveling to a place near Austin?

Book flights to Austin if you plan to visit one of these locations
Fredericksburg
San Marcos
Wimberley
Round Rock
Georgetown
Canyon Lake
Marble Falls
Cedar Park
Horseshoe Bay
Dripping Springs
Pflugerville
Seguin
Kyle
Bastrop
Buda
Flatonia

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Austin?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Austin from St. Louis.

Can I find flights from St. Louis to Austin with flexible booking policies on momondo?

momondo does allow users to show only those flights to Austin from St. Louis which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from St. Louis to Austin?

momondo helps you find the best flight between St. Louis and Austin by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from St. Louis to Austin right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of St. Louis to Austin flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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1 adult
Thu 10/16
Thu 10/23

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