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Cheap flights from St. Louis to Austin from $55

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 1/12. 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

Enter your travel dates to find the best prices.
Frontier Logo
10:47 am - 5:13 pmSTL-AUS
6h 26m1 stop
Frontier Logo
10:22 pm - 12:12 pmAUS-STL
13h 50m1 stop
$110Frontier
Find Deal
Mon, Dec 8 - Thu, Dec 11
Frontier Logo
3:30 pm - 11:12 pmSTL-AUS
31h 42m2 stops
Frontier Logo
6:55 am - 10:14 amAUS-STL
27h 19m1 stop
$158Frontier
Find Deal
Tue, Dec 9 - Tue, Dec 16
Frontier Logo
7:43 pm - 10:38 pmSTL-AUS
26h 55m1 stop
Frontier Logo
6:45 am - 10:33 pmAUS-STL
15h 48m2 stops
$171Frontier
Find Deal
Wed, Nov 26 - Wed, Dec 3
Frontier Logo
11:12 am - 5:17 pmSTL-AUS
6h 05m1 stop
Frontier Logo
6:08 pm - 10:33 pmAUS-STL
28h 25m2 stops
$172Frontier
Find Deal
Fri, Jan 16 - Mon, Jan 19
Frontier Logo
3:30 pm - 11:12 pmSTL-AUS
31h 42m2 stops
Frontier Logo
6:55 am - 10:14 amAUS-STL
27h 19m1 stop
$182Frontier
Find Deal
Tue, Dec 2 - Tue, Dec 16
Frontier Logo
7:43 pm - 12:14 amSTL-AUS
28h 31m1 stop
Frontier Logo
2:44 pm - 10:02 amAUS-STL
19h 18m1 stop
$191Frontier
Find Deal
Sat, Dec 20 - Mon, Jan 5
Frontier Logo
7:57 pm - 9:51 amSTL-AUS
13h 54m1 stop
Frontier Logo
6:40 pm - 10:33 pmAUS-STL
27h 53m1 stop
$192Frontier
Find Deal
Thu, Nov 27 - Mon, Dec 1
Frontier Logo
7:43 pm - 12:14 amSTL-AUS
28h 31m1 stop
Frontier Logo
6:55 am - 9:40 amAUS-STL
26h 45m2 stops
$194Frontier
Find Deal
Wed, Dec 10 - Wed, Dec 17
Frontier Logo
10:42 am - 5:13 pmSTL-AUS
6h 31m1 stop
Frontier Logo
10:22 pm - 12:12 pmAUS-STL
13h 50m1 stop
$195Frontier
Find Deal
Fri, Dec 5 - Sun, Dec 7
Southwest Logo
2:40 pm - 4:50 pmSTL-AUS
2h 10mnonstop
Southwest Logo
3:20 pm - 5:25 pmAUS-STL
2h 05mnonstop
$197Southwest
Find Deal
Wed, Dec 10 - Wed, Dec 17

Frontier flights from St. Louis to Austin

Our best Frontier deals on St. Louis to Austin flight tickets
Frontier
Dec 8
STL10:47 amLambert-St Louis
6h 26m
1 stop
AUS5:13 pmAustin Bergstrom
Dec 11
AUS10:22 pmAustin Bergstrom
13h 50m
1 stop
STL12:12 pmLambert-St Louis
$110
Find similar
Frontier
Feb 27
STL10:42 amLambert-St Louis
6h 21m
1 stop
AUS5:03 pmAustin Bergstrom
Mar 1
AUS6:45 amAustin Bergstrom
27h 17m
1 stop
STL10:02 amLambert-St Louis
$142
Find similar
Frontier
Dec 9
STL3:30 pmLambert-St Louis
31h 42m
2 stops
AUS11:12 pmAustin Bergstrom
Dec 16
AUS6:55 amAustin Bergstrom
27h 19m
1 stop
STL10:14 amLambert-St Louis
$158
Find similar

Delta flights from St. Louis to Austin

Our best Delta deals on St. Louis to Austin flight tickets
Delta
Dec 9
STL5:34 pmLambert-St Louis
5h 28m
1 stop
AUS11:02 pmAustin Bergstrom
Dec 17
AUS9:40 amAustin Bergstrom
7h 09m
1 stop
STL4:49 pmLambert-St Louis
$207
Find similar
Delta
Dec 4
STL11:40 amLambert-St Louis
5h 52m
1 stop
AUS5:32 pmAustin Bergstrom
Dec 6
AUS3:24 pmAustin Bergstrom
6h 33m
1 stop
STL9:57 pmLambert-St Louis
$227
Find similar
Delta
Apr 27
STL6:45 amLambert-St Louis
8h 45m
1 stop
AUS3:30 pmAustin Bergstrom
Apr 28
AUS1:05 pmAustin Bergstrom
7h 26m
1 stop
STL8:31 pmLambert-St Louis
$228
Find similar

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 November 13, 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

Mon 12/8

10:47 am-5:13 pm

1 stop6h 26m

Austin Bergstrom

Thu 12/11

10:22 pm-12:12 pm

1 stop13h 50m

$110

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Tue 12/9

3:30 pm-11:12 pm

2 stops31h 42m

Austin Bergstrom

Tue 12/16

6:55 am-10:14 am

1 stop27h 19m

$158

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Wed 11/26

7:43 pm-10:38 pm

1 stop26h 55m

Austin Bergstrom

Wed 12/3

6:45 am-10:33 pm

2 stops15h 48m

$171

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Fri 1/16

11:12 am-5:17 pm

1 stop6h 05m

Austin Bergstrom

Mon 1/19

6:08 pm-10:33 pm

2 stops28h 25m

$172

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Tue 12/2

3:30 pm-11:12 pm

2 stops31h 42m

Austin Bergstrom

Tue 12/16

6:55 am-10:14 am

1 stop27h 19m

$182

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Sat 12/20

7:43 pm-12:14 am

1 stop28h 31m

Austin Bergstrom

Mon 1/5

2:44 pm-10:02 am

1 stop19h 18m

$191

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Thu 11/27

7:57 pm-9:51 am

1 stop13h 54m

Austin Bergstrom

Mon 12/1

6:40 pm-10:33 pm

1 stop27h 53m

$192

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Wed 12/10

7:43 pm-12:14 am

1 stop28h 31m

Austin Bergstrom

Wed 12/17

6:55 am-9:40 am

2 stops26h 45m

$194

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Fri 12/5

10:42 am-5:13 pm

1 stop6h 31m

Austin Bergstrom

Sun 12/7

10:22 pm-12:12 pm

1 stop13h 50m

$195

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Wed 12/10

2:40 pm-4:50 pm

Nonstop2h 10m

Austin Bergstrom

Wed 12/17

3:20 pm-5:25 pm

Nonstop2h 05m

$197

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 $252.

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 $292. 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 $331. 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 $363. 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 $319 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 $237 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?

You could potentially save up to 19% on your flight if you consider stops on a St. Louis to Austin flight.

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

As of November 2025, prices for St. Louis to Austin flights are approximately 19% cheaper 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

$189

Fastest flight time

2h 10m

Direct flights

Every day

Airports in Austin

1 airport
The best one-way flight to Austin from St. Louis in the past 72 hours is $189. The best round-trip flight deal from St. Louis to Austin found on momondo in the last 72 hours is $270.
The fastest flight from St. Louis to Austin takes 2h 10m
Direct flights go from St. Louis to Austin every day.
There is 1 airport near Austin: 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 10m, 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
8,007 reviews
Search Delta flights
FrontierPriceFrom $135Free CancellationRating
5.8
3,109 reviews
Search Frontier flights
United AirlinesPriceFrom $167Free CancellationRating
7.4
9,017 reviews
Search United Airlines flights
American AirlinesPriceFrom $183Free CancellationRating
7.2
11,051 reviews
Search American Airlines flights
SouthwestPriceFrom $199Free CancellationRating
8.0
4,242 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 27 Southwest flights for this route in a normal week, average airfare is usually $332 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
Seguin
Pflugerville
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.

An easier way to manage your Austin trip

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