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Cheap flights from St. Louis to Austin from $65

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 2/21. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from St. Louis to Austin

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
2:51 pm - 12:16 am
STL
-
AUS
9h 25m
1 stop
Frontier Logo
8:30 am - 3:53 pm
AUS
-
STL
7h 23m
1 stop
$144Frontier
Sat, Feb 28 - Wed, Mar 4
Multiple Airlines Logo
3:49 pm - 4:04 pm
STL
-
AUS
24h 15m
1 stop
Multiple Airlines Logo
3:30 pm - 6:51 am
AUS
-
STL
15h 21m
1 stop
$153Multiple Airlines
Tue, Feb 17 - Fri, Feb 20
Frontier Logo
4:51 pm - 11:13 pm
STL
-
AUS
6h 22m
1 stop
Frontier Logo
8:30 am - 3:53 pm
AUS
-
STL
7h 23m
1 stop
$160Frontier
Wed, Feb 18 - Wed, Feb 25
Multiple Airlines Logo
8:17 pm - 3:40 pm
STL
-
AUS
19h 23m
1 stop
Multiple Airlines Logo
7:15 am - 10:27 pm
AUS
-
STL
15h 12m
2 stops
$162Multiple Airlines
Wed, Feb 18 - Wed, Feb 25
Multiple Airlines Logo
8:22 pm - 5:02 pm
STL
-
AUS
20h 40m
1 stop
Multiple Airlines Logo
4:59 pm - 10:27 pm
AUS
-
STL
29h 28m
1 stop
$165Multiple Airlines
Wed, Feb 4 - Tue, Feb 10
Multiple Airlines Logo
8:22 pm - 5:02 pm
STL
-
AUS
20h 40m
1 stop
Multiple Airlines Logo
7:25 am - 10:27 pm
AUS
-
STL
15h 02m
2 stops
$169Multiple Airlines
Wed, Feb 4 - Tue, Feb 10
Frontier Logo
8:12 pm - 10:06 am
STL
-
AUS
13h 54m
1 stop
Frontier Logo
10:58 pm - 9:49 am
AUS
-
STL
10h 51m
1 stop
$175Frontier
Fri, Mar 6 - Sun, Mar 8
Multiple Airlines Logo
3:49 pm - 8:53 pm
STL
-
AUS
29h 04m
2 stops
Multiple Airlines Logo
7:41 pm - 10:27 pm
AUS
-
STL
26h 46m
1 stop
$176Multiple Airlines
Mon, Feb 16 - Mon, Feb 23
Frontier Logo
2:51 pm - 12:16 am
STL
-
AUS
9h 25m
1 stop
Frontier Logo
6:45 am - 1:09 pm
AUS
-
STL
6h 24m
1 stop
$179Frontier
Sat, Feb 21 - Fri, Feb 27
Frontier Logo
3:46 pm - 11:11 pm
STL
-
AUS
7h 25m
1 stop
Frontier Logo
11:16 am - 11:33 pm
AUS
-
STL
12h 17m
1 stop
$181Frontier
Sat, Jan 31 - Sat, Feb 7

Frontier flights from St. Louis to Austin

Our best Frontier deals on St. Louis to Austin flight tickets
Frontier
Feb 28
STL2:51 pmLambert-St Louis
9h 25m
1 stop
AUS12:16 amAustin Bergstrom
Mar 4
AUS8:30 amAustin Bergstrom
7h 23m
1 stop
STL3:53 pmLambert-St Louis
$144
Frontier
Feb 18
STL8:17 pmLambert-St Louis
19h 23m
1 stop
AUS3:40 pmAustin Bergstrom
Feb 23
AUS11:22 amAustin Bergstrom
8h 40m
1 stop
STL8:02 pmLambert-St Louis
$146
Frontier
Feb 18
STL4:51 pmLambert-St Louis
6h 22m
1 stop
AUS11:13 pmAustin Bergstrom
Feb 25
AUS8:30 amAustin Bergstrom
7h 23m
1 stop
STL3:53 pmLambert-St Louis
$160

Delta flights from St. Louis to Austin

Our best Delta deals on St. Louis to Austin flight tickets
Delta
Apr 11
STL7:03 amLambert-St Louis
6h 20m
1 stop
AUS1:23 pmAustin Bergstrom
Apr 14
AUS3:34 pmAustin Bergstrom
7h 59m
1 stop
STL11:33 pmLambert-St Louis
$220
Delta
Feb 26
STL6:47 pmLambert-St Louis
5h 35m
1 stop
AUS12:22 amAustin Bergstrom
Mar 4
AUS6:00 pmAustin Bergstrom
5h 23m
1 stop
STL11:23 pmLambert-St Louis
$231
Delta
Jan 24
STL6:10 amLambert-St Louis
6h 52m
1 stop
AUS1:02 pmAustin Bergstrom
Jan 25
AUS6:25 pmAustin Bergstrom
5h 12m
1 stop
STL11:37 pmLambert-St Louis
$361

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 January 21, 2026.
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

Sat 2/28

2:51 pm-12:16 am

1 stop9h 25m

Austin Bergstrom

Wed 3/4

8:30 am-3:53 pm

1 stop7h 23m

$144

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Tue 2/17

3:49 pm-4:04 pm

1 stop24h 15m

Austin Bergstrom

Fri 2/20

3:30 pm-6:51 am

1 stop15h 21m

$153

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Wed 2/18

4:51 pm-11:13 pm

1 stop6h 22m

Austin Bergstrom

Wed 2/25

8:30 am-3:53 pm

1 stop7h 23m

$160

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Wed 2/18

8:17 pm-3:40 pm

1 stop19h 23m

Austin Bergstrom

Wed 2/25

7:15 am-10:27 pm

2 stops15h 12m

$162

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Wed 2/4

8:22 pm-5:02 pm

1 stop20h 40m

Austin Bergstrom

Tue 2/10

4:59 pm-10:27 pm

1 stop29h 28m

$165

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Wed 2/4

8:22 pm-5:02 pm

1 stop20h 40m

Austin Bergstrom

Tue 2/10

7:25 am-10:27 pm

2 stops15h 02m

$169

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Fri 3/6

8:12 pm-10:06 am

1 stop13h 54m

Austin Bergstrom

Sun 3/8

10:58 pm-9:49 am

1 stop10h 51m

$175

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Mon 2/16

3:49 pm-8:53 pm

2 stops29h 04m

Austin Bergstrom

Mon 2/23

7:41 pm-10:27 pm

1 stop26h 46m

$176

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Sat 2/21

2:51 pm-12:16 am

1 stop9h 25m

Austin Bergstrom

Fri 2/27

6:45 am-1:09 pm

1 stop6h 24m

$179

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Sat 1/31

3:46 pm-11:11 pm

1 stop7h 25m

Austin Bergstrom

Sat 2/7

11:16 am-11:33 pm

1 stop12h 17m

$181

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 $227, 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 $254.

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 Tuesday when prices can be found for as low as $303. 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 evening is the cheapest time of day to fly from St. Louis to Austin when you can find flight prices for as low as $303. Flying to Austin in the evening 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 $345. 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 $311 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 $192 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 January 2026, prices for St. Louis to Austin flights are approximately 24% 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

$148

Fastest flight time

2h 00m

Direct flights

Mon, Wed, 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 $148. The best round-trip flight deal from St. Louis to Austin found on momondo in the last 72 hours is $275.
The fastest flight from St. Louis to Austin takes 2h 00m
Direct flights go from St. Louis to Austin on Monday, Wednesday, Thursday, Friday, Saturday and Sunday. The only airline offering direct flights is Southwest.
There is 1 airport in Austin. From St. Louis there are direct flights to Austin Bergstrom (AUS).
Search flight deals

  • 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
8,089 reviews
Search Delta flights
FrontierPriceFrom $135Free CancellationRating
5.7
3,057 reviews
Search Frontier flights
United AirlinesPriceFrom $167Free CancellationRating
7.4
9,191 reviews
Search United Airlines flights
American AirlinesPriceFrom $176Free CancellationRating
7.2
11,174 reviews
Search American Airlines flights
SouthwestPriceFrom $199Free CancellationRating
8.0
4,266 reviews
Search Southwest flights

  • Southwest Flights From St. Louis to Austin

    Southwest flight deals from St. Louis to Austin start from $199 round-trip. Over the 12 Southwest flights for this route in a normal week, average airfare is usually $325 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
Wimberley
San Marcos
Round Rock
Georgetown
Canyon Lake
Marble Falls
Cedar Park
Horseshoe Bay
Dripping Springs
Pflugerville
Kyle
Seguin
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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