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Cheap flights from Austin to St. Louis from $57

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Austin to St. Louis departing on 2/3. 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 Austin to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
10:18 am - 7:41 pm
AUS
-
STL
9h 23m1 stop
Frontier Logo
8:45 am - 5:08 pm
STL
-
AUS
8h 23m1 stop
$128Frontier
Fri, Feb 20 - Sun, Feb 22
Frontier Logo
10:32 am - 10:02 am
AUS
-
STL
23h 30m1 stop
Frontier Logo
7:43 pm - 12:16 am
STL
-
AUS
28h 33m1 stop
$133Frontier
Tue, Jan 6 - Wed, Jan 7
Multiple Airlines Logo
10:32 am - 10:02 am
AUS
-
STL
23h 30m1 stop
Multiple Airlines Logo
5:11 pm - 4:04 pm
STL
-
AUS
22h 53m1 stop
$136Multiple Airlines
Tue, Jan 6 - Sun, Jan 11
Frontier Logo
3:01 pm - 10:02 am
AUS
-
STL
19h 01m1 stop
Frontier Logo
5:11 pm - 5:07 pm
STL
-
AUS
23h 56m1 stop
$137Frontier
Fri, Jan 9 - Sun, Jan 11
Southwest Logo
5:35 am - 7:35 am
AUS
-
STL
2h 00mnonstop
Southwest Logo
10:25 am - 12:45 pm
STL
-
AUS
2h 20mnonstop
$140Southwest
Tue, Jan 6 - Tue, Jan 6
Multiple Airlines Logo
4:59 pm - 11:11 am
AUS
-
STL
18h 12m1 stop
Multiple Airlines Logo
3:46 pm - 11:11 pm
STL
-
AUS
7h 25m1 stop
$143Multiple Airlines
Fri, Jan 23 - Sat, Jan 24
Southwest Logo
6:30 am - 11:15 am
AUS
-
STL
4h 45m1 stop
Southwest Logo
7:55 pm - 10:10 pm
STL
-
AUS
2h 15mnonstop
$145Southwest
Tue, Jan 6 - Tue, Jan 6
Frontier Logo
6:45 am - 10:02 am
AUS
-
STL
27h 17m1 stop
Frontier Logo
7:43 pm - 9:42 pm
STL
-
AUS
25h 59m1 stop
$148Frontier
Thu, Jan 8 - Mon, Jan 12
Southwest Logo
10:45 am - 3:00 pm
AUS
-
STL
4h 15m1 stop
Southwest Logo
5:55 pm - 10:50 pm
STL
-
AUS
4h 55m1 stop
$150Southwest
Tue, Jan 6 - Tue, Jan 6
Multiple Airlines Logo
7:25 am - 11:33 pm
AUS
-
STL
16h 08m2 stops
Multiple Airlines Logo
3:46 pm - 11:11 pm
STL
-
AUS
7h 25m1 stop
$154Multiple Airlines
Fri, Jan 23 - Sat, Jan 24

Frontier flights from Austin to St. Louis

Our best Frontier deals on Austin to St. Louis flight tickets
Frontier
Feb 20
AUS10:18 amAustin Bergstrom
9h 23m
1 stop
STL7:41 pmLambert-St Louis
Feb 22
STL8:45 amLambert-St Louis
8h 23m
1 stop
AUS5:08 pmAustin Bergstrom
$128
Find similar
Frontier
Jan 6
AUS10:32 amAustin Bergstrom
23h 30m
1 stop
STL10:02 amLambert-St Louis
Jan 7
STL7:43 pmLambert-St Louis
28h 33m
1 stop
AUS12:16 amAustin Bergstrom
$133
Find similar
Frontier
Jan 9
AUS3:01 pmAustin Bergstrom
19h 01m
1 stop
STL10:02 amLambert-St Louis
Jan 11
STL5:11 pmLambert-St Louis
23h 56m
1 stop
AUS5:07 pmAustin Bergstrom
$137
Find similar

Southwest flights from Austin to St. Louis

Our best Southwest deals on Austin to St. Louis flight tickets
Southwest
Jan 6
AUS5:35 amAustin Bergstrom
2h 00m
STL7:35 amLambert-St Louis
Jan 6
STL10:25 amLambert-St Louis
2h 20m
AUS12:45 pmAustin Bergstrom
$140
Find similar
Southwest
Jan 6
AUS6:30 amAustin Bergstrom
4h 45m
1 stop
STL11:15 amLambert-St Louis
Jan 6
STL7:55 pmLambert-St Louis
2h 15m
AUS10:10 pmAustin Bergstrom
$145
Find similar
Southwest
Jan 6
AUS10:45 amAustin Bergstrom
4h 15m
1 stop
STL3:00 pmLambert-St Louis
Jan 6
STL5:55 pmLambert-St Louis
4h 55m
1 stop
AUS10:50 pmAustin Bergstrom
$150
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Austin to St. Louis 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 December 4, 2025.
Use the filters below to find and compare flights from Austin to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

AustinSt. Louis

AUS - STL

AUSSTL

Austin Bergstrom

Fri 2/20

10:18 am-7:41 pm

1 stop9h 23m

Lambert-St Louis

Sun 2/22

8:45 am-5:08 pm

1 stop8h 23m

$128

AustinSt. Louis

AUS - STL

AUSSTL

Austin Bergstrom

Tue 1/6

10:32 am-10:02 am

1 stop23h 30m

Lambert-St Louis

Wed 1/7

7:43 pm-12:16 am

1 stop28h 33m

$133

AustinSt. Louis

AUS - STL

AUSSTL

Austin Bergstrom

Tue 1/6

10:32 am-10:02 am

1 stop23h 30m

Lambert-St Louis

Sun 1/11

5:11 pm-4:04 pm

1 stop22h 53m

$136

AustinSt. Louis

AUS - STL

AUSSTL

Austin Bergstrom

Fri 1/9

3:01 pm-10:02 am

1 stop19h 01m

Lambert-St Louis

Sun 1/11

5:11 pm-5:07 pm

1 stop23h 56m

$137

AustinSt. Louis

AUS - STL

AUSSTL

Austin Bergstrom

Tue 1/6

5:35 am-7:35 am

Nonstop2h 00m

Lambert-St Louis

Tue 1/6

10:25 am-12:45 pm

Nonstop2h 20m

$140

AustinSt. Louis

AUS - STL

AUSSTL

Austin Bergstrom

Fri 1/23

4:59 pm-11:11 am

1 stop18h 12m

Lambert-St Louis

Sat 1/24

3:46 pm-11:11 pm

1 stop7h 25m

$143

AustinSt. Louis

AUS - STL

AUSSTL

Austin Bergstrom

Tue 1/6

6:30 am-11:15 am

1 stop4h 45m

Lambert-St Louis

Tue 1/6

7:55 pm-10:10 pm

Nonstop2h 15m

$145

AustinSt. Louis

AUS - STL

AUSSTL

Austin Bergstrom

Thu 1/8

6:45 am-10:02 am

1 stop27h 17m

Lambert-St Louis

Mon 1/12

7:43 pm-9:42 pm

1 stop25h 59m

$148

AustinSt. Louis

AUS - STL

AUSSTL

Austin Bergstrom

Tue 1/6

10:45 am-3:00 pm

1 stop4h 15m

Lambert-St Louis

Tue 1/6

5:55 pm-10:50 pm

1 stop4h 55m

$150

AustinSt. Louis

AUS - STL

AUSSTL

Austin Bergstrom

Fri 1/23

7:25 am-11:33 pm

2 stops16h 08m

Lambert-St Louis

Sat 1/24

3:46 pm-11:11 pm

1 stop7h 25m

$154

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 St. Louis from

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

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 typical price of a round-trip flight between Austin and St. Louis?

What is the cheapest month to fly to St. Louis?

In general, October is the cheapest month to fly from Austin to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $271. The month of April is another great option to travel to St. Louis, with average flight prices from Austin averaging around $303.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Tuesday when prices can be found for as low as $306. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $475. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Austin in the evening is the least expensive time of day to depart. momondo users have found prices as low as $238 when looking at flights departing in the evening. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $398 per ticket.

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

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

How far in advance should I book a flight to St. Louis?

You are more likely to see cheaper flights to St. Louis from Austin when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $332 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Austin for as low as $216 on momondo.

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

There is only 1 cabin class available to choose from on Austin Bergstrom to Lambert-St Louis 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 Austin to St. Louis flights?

You could potentially save up to 11% on your flight if you consider stops on a Austin to St. Louis flight.

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

As of December 2025, prices for Austin to St. Louis flights are approximately 52% more expensive when compared to flights at the same time last year.

When to book flights from Austin to St. Louis

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

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

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

Best Price Found

$164

Fastest flight time

2h 00m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Austin in the past 72 hours is $164. The best round-trip flight deal from Austin to St. Louis found on momondo in the last 72 hours is $316.
The fastest flight from Austin to St. Louis takes 2h 00m
Direct flights go from Austin to St. Louis every day.
There is 1 airport near St. Louis: Lambert-St Louis (STL)
Search flight deals

  • How far is Austin Bergstrom to Lambert-St Louis by plane?

    The distance between Austin Bergstrom and Lambert-St Louis is about 718.3 mi. Typically, this will take 2h 00m by plane in normal conditions.

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

    Prices for flights from Austin Bergstrom Airport to Lambert-St Louis Airport were last updated today.

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

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Austin Bergstrom Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The required travel and health documents for your Lambert-St Louis Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Lambert-St Louis Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

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

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

Best airlines flying from Austin to St. Louis

Compare and see reviews for airlines that fly from Austin to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $195Free CancellationRating
5.8
3,092 reviews
Search Frontier flights
SouthwestPriceFrom $198Free CancellationRating
8.0
4,253 reviews
Search Southwest flights
United AirlinesPriceFrom $200Free CancellationRating
7.4
9,063 reviews
Search United Airlines flights
American AirlinesPriceFrom $224Free CancellationRating
7.2
11,045 reviews
Search American Airlines flights

  • Southwest Flights From Austin to St. Louis

    Southwest flight deals from Austin to St. Louis start from $198 round-trip. Over the 20 Southwest flights for this route in a normal week, average airfare is usually $326 round-trip - but some users have found much cheaper deals with momondo.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
O'Fallon
Florissant
Fenton
Wentzville
Collinsville
St. Peters
Alton
Farmington
Clayton
Festus
Glencoe
Edwardsville
Eureka
Litchfield
Shrewsbury

Why use momondo?

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

Finding the right flight to St. Louis from Austin is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to St. Louis quick and easy, saving you time and money.

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

Yes. momondo enables you to select and highlight flights to St. Louis from Austin with this policy.

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

momondo provides multiple filters to help you find the best flight to St. Louis from Austin. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Of course. momondo tracks the price of Austin to St. Louis 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 St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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