$69 Cheap Flights from Austin (AUS) to St. Louis (STL)

View $69 flight on Tue, Dec 2, 2025Opens in a new window

Popular airlines from Austin-Bergstrom Intl. Airport (AUS) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from Austin to St. Louis (AUS-STL)

Prices were available within the past 7 days and start at $69 for one-way flights and $137 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Wed, Dec 3 - Tue, Dec 9
AUS
Austin
STL
St. Louis
$137 Roundtrip, found 6 hours ago
$137
Roundtrip
found 6 hours ago
Select Southwest Airlines flight, departing Wed, Dec 3 from Austin to St. Louis, returning Tue, Dec 9, priced at $137 found 6 hours ago
Southwest Airlines
Wed, Dec 3 - Tue, Dec 9
AUS
Austin
STL
St. Louis
$143 Roundtrip, found 6 hours ago
$143
Roundtrip
found 6 hours ago
Select Southwest Airlines flight, departing Wed, Dec 3 from Austin to St. Louis, returning Tue, Dec 9, priced at $143 found 6 hours ago
Southwest Airlines
Wed, Oct 22 - Sat, Oct 25
AUS
Austin
STL
St. Louis
$146 Roundtrip, found 3 days ago
$146
Roundtrip
found 3 days ago
Select Southwest Airlines flight, departing Wed, Oct 22 from Austin to St. Louis, returning Sat, Oct 25, priced at $146 found 3 days ago
United
Tue, Oct 21 - Wed, Oct 22
AUS
Austin
STL
St. Louis
$146 Roundtrip, found 4 days ago
$146
Roundtrip
found 4 days ago
Select United flight, departing Tue, Oct 21 from Austin to St. Louis, returning Wed, Oct 22, priced at $146 found 4 days ago
Southwest Airlines
Wed, Dec 10 - Sat, Dec 13
AUS
Austin
STL
St. Louis
$147 Roundtrip, found 4 days ago
$147
Roundtrip
found 4 days ago
Select Southwest Airlines flight, departing Wed, Dec 10 from Austin to St. Louis, returning Sat, Dec 13, priced at $147 found 4 days ago
American Airlines
Wed, Dec 3 - Tue, Dec 9
AUS
Austin
STL
St. Louis
$148 Roundtrip, found 6 hours ago
$148
Roundtrip
found 6 hours ago
Select American Airlines flight, departing Wed, Dec 3 from Austin to St. Louis, returning Tue, Dec 9, priced at $148 found 6 hours ago
United
Sat, Dec 13 - Tue, Dec 16
AUS
Austin
STL
St. Louis
$149 Roundtrip, found 4 days ago
$149
Roundtrip
found 4 days ago
Select United flight, departing Sat, Dec 13 from Austin to St. Louis, returning Tue, Dec 16, priced at $149 found 4 days ago
United
Thu, Dec 11 - Mon, Dec 15
AUS
Austin
STL
St. Louis
$151 Roundtrip, found 3 days ago
$151
Roundtrip
found 3 days ago
Select United flight, departing Thu, Dec 11 from Austin to St. Louis, returning Mon, Dec 15, priced at $151 found 3 days ago
Spirit Airlines
Sat, Jan 24 - Sat, Jan 31
AUS
Austin
STL
St. Louis
$159 Roundtrip, found 1 day ago
$159
Roundtrip
found 1 day ago
Select Spirit Airlines flight, departing Sat, Jan 24 from Austin to St. Louis, returning Sat, Jan 31, priced at $159 found 1 day ago
Frontier Airlines
Fri, Oct 24 - Sat, Nov 1
AUS
Austin
STL
St. Louis
$168 Roundtrip, found 1 day ago
$168
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Fri, Oct 24 from Austin to St. Louis, returning Sat, Nov 1, priced at $168 found 1 day ago

Find the cheapest month to fly from Austin (AUS) to St. Louis (STL)

September is typically the cheapest month to fly

From $151 - $811 per traveler.

Frequently asked questions

How much does a flight from Austin-Bergstrom Intl. Airport (AUS) to Lambert-St. Louis Intl. Airport (STL) cost?
Grab a cheap one-way flight from $69 or cheap return flight from $137 from Austin-Bergstrom Intl. Airport (AUS) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Austin-Bergstrom Intl. Airport (AUS) to Lambert-St. Louis Intl. Airport (STL)?
Traveling in December may help you find better deals, as it's the cheapest month for flights between AUS and STL. You'll typically find the lowest prices during the off-season.
Which airlines fly direct from Austin-Bergstrom Intl. Airport (AUS) to Lambert-St. Louis Intl. Airport (STL)?
When setting off from Austin-Bergstrom Intl. Airport (AUS), you can board a nonstop flight to Lambert-St. Louis Intl. Airport (STL) with Southwest Airlines.
What is the cheapest airline that flies from Austin-Bergstrom Intl. Airport (AUS) to Lambert-St. Louis Intl. Airport (STL)?
To find the cheapest airline flying from AUS to STL, use Expedia's filter tool. Tailor your search based on what matters most to you, such as preferred carriers and number of stops. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Austin-Bergstrom Intl. Airport (AUS) to Lambert-St. Louis Intl. Airport (STL)?
On average, only 1 direct flight departs daily from Austin-Bergstrom Intl. Airport (AUS) to Lambert-St. Louis Intl. Airport (STL). Need other options? Use our filters to discover flights with layovers and add an extra destination to your journey.
What are the most popular departure times for flights from Austin-Bergstrom Intl. Airport (AUS) to Lambert-St. Louis Intl. Airport (STL)?
Flights between AUS and STL tend to be busiest at 6 AM. If you're after a quieter trip and possibly cheaper prices, choose a departure that's outside typical rush times.
What day of the week has the most flights from AUS to STL?
Friday offers the most flights from Austin-Bergstrom Intl. Airport (AUS) to Lambert-St. Louis Intl. Airport (STL). Consider leaving on this day and you'll have a greater chance of finding a departure that fits your plans.
What is the earliest flight from Austin-Bergstrom Intl. Airport (AUS) to Lambert-St. Louis Intl. Airport (STL)?
The earliest flight leaving from Austin-Bergstrom Intl. Airport (AUS) is at around 6:40AM UTC-6. Board this plane and you'll land at Lambert-St. Louis Intl. Airport (STL) at approximately 8:40AM UTC-6. The total flight duration is 2h.
How long does it take to fly from Austin-Bergstrom Intl. Airport (AUS) to Lambert-St. Louis Intl. Airport (STL)?
The average flight time from AUS to STL is 2 hours, covering a total distance of 720 mi.
What airline has the least delays from AUS to STL?
Southwest Airlines has the best track record for on-time direct flights from Austin-Bergstrom Intl. Airport (AUS) to Lambert-St. Louis Intl. Airport (STL), with an on-time rating of 80%. Use the Expedia App to check your journey status before you take off and get immediate updates about any trip changes.
What is the best time to fly from Austin-Bergstrom Intl. Airport (AUS) to Lambert-St. Louis Intl. Airport (STL)?
To avoid potential delays on the Austin-Bergstrom Intl. Airport (AUS) to Lambert-St. Louis Intl. Airport (STL) route, fly before 3 PM. Departures after this time have a 22% higher chance of cancellation.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for St. Louis from Austin-Bergstrom Intl. Airport (AUS)?
Lambert-St. Louis Intl. Airport (STL) is the only airport in St. Louis with direct flights from Austin-Bergstrom Intl. Airport (AUS). Browse your options and discover affordable fares on Expedia.
Is it cheaper to buy a plane ticket from Austin-Bergstrom Intl. Airport (AUS) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Last-minute fares from AUS to STL are usually more expensive. To lock in the cheapest rates, start looking for flights well in advance. That being said, if your travel plans are flexible, you may land a cheap ticket right before you leave.
Is it cheaper to book an AUS to STL flight and hotel package?
Compared with arranging hotels and flights separately, booking an AUS to STL flight and hotel package with Expedia could lead to significant savings. Better yet, having everything in one convenient place will take the hassle out of travel planning. Simply pick your flights and select from our extensive range of hotels, then customize your trip with other add-ons like car rentals and activities.
Can I cancel or change the date of my flight from Austin-Bergstrom Intl. Airport (AUS) to Lambert-St. Louis Intl. Airport (STL)?
Usually, it's possible to cancel or reschedule your AUS to STL flight. However, if the booking was made more than 24 hours ago, additional charges may apply. Check your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find more details on our Customer Service portal.

Travel information

Travel information

Origin airport
Austin-Bergstrom Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, Delta, Frontier Airlines, Southwest Airlines, Spirit Airlines, United
Roundtrip price
$137
Distance
721 mi
Average flight time
2 hours 7 mins

Book with confidence

Book with confidence

Austin to St. Louis Flights

The cheapest times to fly from Austin to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Austin to St. Louis are during the month of December. You can find some of the cheapest flights from Austin to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Austin to St. Louis

Sunday is one of the best days to book for cheap flights from Austin to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Austin to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Austin to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $69 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Austin to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Austin to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Austin to St. Louis Flights

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Explore a world of travel with Expedia

*Available to One Key members.