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$79+ Cheap flights from St. Louis to Austin (STL - AUS)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/3. Fares are subject to change and may not be available on all flights or dates of travel.
STL — AUS
Aug 2 — Aug 91
Sat 8/2
Sat 8/9
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Austin Bergstrom are usually found in August or September, booked 63 days in advance, depart on a Tuesday or Saturday and return on a Tuesday

Cheap flight deals from St. Louis to Austin

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Austin (AUS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 28, 2025.

Round-trip from

$157
(Southwest)

One-way from

$79
(Southwest)

Popular in

October

Cheapest in

August

Average price

$333

Good round-trip deal

$254 or less

Good one-way deal

$145 or less
From Lambert-St Louis to Austin Bergstrom
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One-way flight from Lambert-St Louis to Austin Bergstrom
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Highest demand for flights based on searches. 1% potential increase in price ($6 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Lambert-St Louis to Austin Bergstrom.
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Price to beat on a one-way flight from Lambert-St Louis to Austin Bergstrom.
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Find flight deals from St. Louis to Austin

Cheapest flights from St. Louis to Austin
Explore the most affordable flight options available from St. Louis to Austin. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 28, 2025.

This Southwest deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/2610:15 amSTL - AUS
Nonstop2h 00mSouthwest
Tue 9/26:45 amAUS - STL
Nonstop2h 10mSouthwest
Deal found 7/27$157
This American Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/276:06 amSTL - AUS
1 stop5h 02mAmerican Airlines
Tue 9/26:00 amAUS - STL
1 stop6h 54mAmerican Airlines
Deal found 7/27$177
This FlightHub deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/307:29 pmSTL - AUS
1 stop28h 15mFrontier
Wed 8/277:55 amAUS - STL
1 stop25h 16mFrontier
Deal found 7/27$205
This Gotogate deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/612:20 pmSTL - AUS
1 stop10h 52mMultiple Airlines
Sun 11/96:00 amAUS - STL
1 stop27h 07mMultiple Airlines
Deal found 7/26$212
This United Airlines deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/246:15 amSTL - AUS
1 stop4h 43mUnited Airlines
Sun 8/317:00 amAUS - STL
2 stops11h 59mUnited Airlines
Deal found 7/25$266

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated July 28, 2025.
Use the filters below to find and compare flights from St. Louis to Austin that are best for you.

Fly from

St. Louis

Fly to

Austin

Route

Depart

Return

Price

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Tue 8/26

10:15 am-12:15 pm

Nonstop2h 00m

Austin Bergstrom

Tue 9/2

6:45 am-8:55 am

Nonstop2h 10m

$157

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Wed 8/27

6:06 am-11:08 am

1 stop5h 02m

Austin Bergstrom

Tue 9/2

6:00 am-12:54 pm

1 stop6h 54m

$177

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Thu 11/6

12:20 pm-11:12 pm

1 stop10h 52m

Austin Bergstrom

Sun 11/9

6:00 am-9:07 am

1 stop27h 07m

$212

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Tue 10/28

7:52 pm-11:34 pm

1 stop27h 42m

Austin Bergstrom

Sun 11/2

5:00 am-8:07 am

1 stop27h 07m

$215

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Thu 12/4

7:20 am-12:43 pm

1 stop5h 23m

Austin Bergstrom

Sun 12/7

6:30 am-11:32 am

1 stop5h 02m

$291

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Fri 8/22

5:30 pm-11:10 pm

1 stop5h 40m

Austin Bergstrom

Sat 8/23

5:30 am-3:44 pm

2 stops10h 14m

$314

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Fri 8/8

10:47 am-10:18 pm

3 stops35h 31m

Austin Bergstrom

Tue 8/12

7:30 am-4:31 pm

1 stop9h 01m

$359

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Wed 9/3

4:25 pm-6:25 pm

Nonstop2h 00m

$79

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Tue 10/28

6:00 am-11:11 am

1 stop5h 11m

$87

St. LouisAustin

STL - AUS

STLAUS

Lambert-St Louis

Thu 10/30

10:35 am-11:56 pm

1 stop13h 21m

$92

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 14 results
1
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Best time to book a flight from St. Louis to Austin

Have a flexible travel schedule? Discover the best time to fly to Austin from St. Louis 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 St. Louis to Austin

How far ahead should I book a flight from St. Louis to Austin?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Austin. Price data was last updated on July 25, 2025.

The price you pay for your flight from St. Louis to Austin may vary depending on when you book. For the best chance of a lower fare, look to book 36 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from St. Louis to Austin?

Currently, January is the cheapest month in which you can book a flight from St. Louis to Austin (average of $286). Flying from St. Louis to Austin in March is currently the most expensive (average of $362). 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 STL to AUS?

Find hourly flight availability from St. Louis to Austin. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 28, 2025.

When flying from St. Louis to Austin, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 4% versus a flight in the afternoon.

What is the cheapest day to fly from St. Louis to Austin?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Austin. Price data was last updated on July 20, 2025.

Travelers seeking maximum savings on their St. Louis to Austin flight should consider departing on Tuesday mornings when fares are most often at their lowest. Tuesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Austin

Get insights into the airlines that provide service to Austin. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Austin. Reviews last updated July 28, 2025.
Read reviews from past customers who have flown Southwest, United Airlines, and American Airlines from St. Louis to Austin. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

Comfort

8.0

Entertainment

7.5

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.
Southwest
8.0
Very good
4,238 reviews
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

Comfort

8.0

Entertainment

7.5

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
8,892 reviews
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

Comfort

8.0

Entertainment

7.5

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
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

Comfort

8.0

Entertainment

7.5

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.
Spirit Airlines
6.3
Okay
8,040 reviews
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

Comfort

8.0

Entertainment

7.5

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
5.9
Fair
3,238 reviews
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

Comfort

8.0

Entertainment

7.5

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.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Austin. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airports do I use to fly from St. Louis to Austin?

    If you book a flight from St. Louis to Austin, you will be flying from Lambert-St Louis to Austin Bergstrom. Flights to Austin Bergstrom (AUS) from Lambert-St Louis (STL) take 2h 00m for a nonstop flight. There are 2 flights from Lambert-St Louis to Austin per day from 5 airlines.

  • How popular is this St. Louis to Austin flight route?

    The Lambert-St Louis to Austin Bergstrom flight path was viewed by 8 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • What are the cheapest airlines flying from St. Louis to Austin round-trip?

    According to our current data, Southwest ($157), American Airlines ($177), and Frontier ($215) offers the cheapest pricing from St. Louis to Austin. Users have found that Southwest is 50% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from St. Louis to Austin one-way?

    The cheapest airlines for a one-way flight from St. Louis to Austin are Southwest ($79), American Airlines ($87), and Spirit Airlines ($92).

  • What are the cheapest flights from St. Louis to Austin?

    While on average a flight from St. Louis to Austin is generally $293, our data shows the cheapest flight currently is $98. When looking at the most popular route, (Lambert-St Louis - Austin Bergstrom), you can expect to pay $157 for that flight.

  • Can I find deals for flights from St. Louis to Austin that include hotel bookings?

    Yes. In addition to deals on St. Louis to Austin flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Austin?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Austin.

  • Can I find deals for business class flights from St. Louis to Austin?

    Yes. Cheapflights offers flight deals from St. Louis to Austin by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to Austin?

    Currently, January is the cheapest month in which you can book a flight from St. Louis to Austin (average of $286). Flying from St. Louis to Austin in March is currently the most expensive (average of $362). 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.

See more FAQs

Traveling to a place near Austin?

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

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Top 5 airlines flying from St. Louis to Austin

Discover the top 5 airlines that operate flights from St. Louis to Austin. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$98Average$270FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$135Average$198FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$210Average$306FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$214Average$336FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$244Average$356FlexibilityNo cancel feeOn-time69%

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