$79 Cheap Flights from Austin (AUS) to St. Louis (STL)

View $79 flight on Thu, Oct 9, 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 $79 for one-way flights and $157 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Thu, Oct 9 - Mon, Oct 13
AUS
Austin
STL
St. Louis
$157 Roundtrip, just found
$157
Roundtrip
just found
Select Southwest Airlines flight, departing Thu, Oct 9 from Austin to St. Louis, returning Mon, Oct 13, priced at $157 just found
Southwest Airlines
Wed, Aug 27 - Sat, Aug 30
AUS
Austin
STL
St. Louis
$167 Roundtrip, found 2 hours ago
$167
Roundtrip
found 2 hours ago
Select Southwest Airlines flight, departing Wed, Aug 27 from Austin to St. Louis, returning Sat, Aug 30, priced at $167 found 2 hours ago
American Airlines
Tue, Aug 19 - Thu, Aug 21
AUS
Austin
STL
St. Louis
$168 Roundtrip, found 23 hours ago
$168
Roundtrip
found 23 hours ago
Select American Airlines flight, departing Tue, Aug 19 from Austin to St. Louis, returning Thu, Aug 21, priced at $168 found 23 hours ago
Southwest Airlines
Thu, Sep 4 - Sat, Sep 6
AUS
Austin
STL
St. Louis
$169 Roundtrip, found 3 hours ago
$169
Roundtrip
found 3 hours ago
Select Southwest Airlines flight, departing Thu, Sep 4 from Austin to St. Louis, returning Sat, Sep 6, priced at $169 found 3 hours ago
Delta
Wed, Aug 27 - Sat, Aug 30
AUS
Austin
STL
St. Louis
$172 Roundtrip, found 2 hours ago
$172
Roundtrip
found 2 hours ago
Select Delta flight, departing Wed, Aug 27 from Austin to St. Louis, returning Sat, Aug 30, priced at $172 found 2 hours ago
Delta
Tue, Aug 19 - Thu, Aug 21
AUS
Austin
STL
St. Louis
$173 Roundtrip, found 23 hours ago
$173
Roundtrip
found 23 hours ago
Select Delta flight, departing Tue, Aug 19 from Austin to St. Louis, returning Thu, Aug 21, priced at $173 found 23 hours ago
Southwest Airlines
Thu, Oct 16 - Thu, Oct 30
AUS
Austin
STL
St. Louis
$176 Roundtrip, found 14 hours ago
$176
Roundtrip
found 14 hours ago
Select Southwest Airlines flight, departing Thu, Oct 16 from Austin to St. Louis, returning Thu, Oct 30, priced at $176 found 14 hours ago
Southwest Airlines
Thu, Oct 9 - Mon, Oct 13
AUS
Austin
STL
St. Louis
$177 Roundtrip, just found
$177
Roundtrip
just found
Select Southwest Airlines flight, departing Thu, Oct 9 from Austin to St. Louis, returning Mon, Oct 13, priced at $177 just found
United
Tue, Oct 7 - Wed, Oct 8
AUS
Austin
STL
St. Louis
$182 Roundtrip, found 1 day ago
$182
Roundtrip
found 1 day ago
Select United flight, departing Tue, Oct 7 from Austin to St. Louis, returning Wed, Oct 8, priced at $182 found 1 day ago
Spirit Airlines
Sat, Dec 13 - Sat, Jan 10
AUS
Austin
STL
St. Louis
$210 Roundtrip, found 2 days ago
$210
Roundtrip
found 2 days ago
Select Spirit Airlines flight, departing Sat, Dec 13 from Austin to St. Louis, returning Sat, Jan 10, priced at $210 found 2 days ago

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

September is typically the cheapest month to fly

From $151 - $550 per traveler.

Graph displaying average flight prices per month

Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $309
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $309
Flights from Austin (AUS) to St. Louis (STL)
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
$157
Distance
721 mi
Average flight time
2 hours 7 mins

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 October. 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 $79 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.

 

Frequently asked questions

How much does a flight from Austin-Bergstrom Intl. Airport (AUS) to Lambert-St. Louis Intl. Airport (STL) cost?
You'll find cheap return fares from Austin-Bergstrom Intl. Airport (AUS) to Lambert-St. Louis Intl. Airport (STL) starting from $157. Book a seat and take off on your trip. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Southwest Airlines flight leaving AUS on August 19 2025 and touching down at STL. The price was last updated on July 23 2025 and has not changed since.
What is the cheapest month to fly from AUS to STL?
The cheapest flights from AUS to STL are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
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 AUS to STL?
Currently, the cheapest airline offering one-way flights from AUS to STL is Southwest Airlines. You can take off on this route from $79. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from AUS on October 16 2025. Prices were last updated on July 23 2025 and have not changed since.
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.

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