Cheap Flights from St Louis MO to Austin-Bergstrom TX from $125

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Flight deals from St Louis to Austin-Bergstrom

Looking for a cheap last-minute deal or the best round-trip flight from St Louis Airport to Austin-Bergstrom Airport? If you want to travel next month, round-trip fares start from $125. Find the lowest prices on one-way and round-trip tickets right here.

Austin.$125 per passenger.Departing Mon, Oct 26, returning Wed, Oct 28.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from St Louis on Mon, Oct 26, arriving in Austin-Bergstrom.Inbound indirect flight with Frontier Airlines, departing from Austin-Bergstrom on Wed, Oct 28, arriving in St Louis.Price includes taxes and charges.From $125, select.

Austin.$170 per passenger.Departing Sat, Oct 31, returning Mon, Nov 2.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from St Louis on Sat, Oct 31, arriving in Austin-Bergstrom.Inbound indirect flight with Frontier Airlines, departing from Austin-Bergstrom on Mon, Nov 2, arriving in St Louis.Price includes taxes and charges.From $170, select.

Austin.$209 per passenger.Departing Thu, Dec 3, returning Sat, Dec 5.Round-trip flight with United.Outbound indirect flight with United, departing from St Louis on Thu, Dec 3, arriving in Austin-Bergstrom.Inbound indirect flight with United, departing from Austin-Bergstrom on Sat, Dec 5, arriving in St Louis.Price includes taxes and charges.From $209, select.

Austin.$210 per passenger.Departing Mon, Oct 26, returning Wed, Oct 28.Round-trip flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from St Louis on Mon, Oct 26, arriving in Austin-Bergstrom.Inbound direct flight with Southwest Airlines departing from Austin-Bergstrom on Wed, Oct 28, arriving in St Louis.Price includes taxes and charges.From $210, select.

Austin.$216 per passenger.Departing Thu, Dec 3, returning Sat, Dec 5.Round-trip flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from St Louis on Thu, Dec 3, arriving in Austin-Bergstrom.Inbound direct flight with Southwest Airlines departing from Austin-Bergstrom on Sat, Dec 5, arriving in St Louis.Price includes taxes and charges.From $216, select.

Austin.$216 per passenger.Departing Sat, Oct 31, returning Mon, Nov 2.Round-trip flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from St Louis on Sat, Oct 31, arriving in Austin-Bergstrom.Inbound direct flight with Southwest Airlines departing from Austin-Bergstrom on Mon, Nov 2, arriving in St Louis.Price includes taxes and charges.From $216, select.

Austin.$222 per passenger.Departing Wed, Nov 4, returning Fri, Nov 6.Round-trip flight with United.Outbound indirect flight with United, departing from St Louis on Wed, Nov 4, arriving in Austin-Bergstrom.Inbound indirect flight with United, departing from Austin-Bergstrom on Fri, Nov 6, arriving in St Louis.Price includes taxes and charges.From $222, select.

Austin.$230 per passenger.Departing Tue, Nov 10, returning Wed, Nov 11.Round-trip flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from St Louis on Tue, Nov 10, arriving in Austin-Bergstrom.Inbound direct flight with Southwest Airlines departing from Austin-Bergstrom on Wed, Nov 11, arriving in St Louis.Price includes taxes and charges.From $230, select.

Austin.$314 per passenger.Departing Fri, Apr 9, returning Sun, Apr 11.Round-trip flight with Delta.Outbound indirect flight with Delta, departing from St Louis on Fri, Apr 9, arriving in Austin-Bergstrom.Inbound indirect flight with Delta, departing from Austin-Bergstrom on Sun, Apr 11, arriving in St Louis.Price includes taxes and charges.From $314, select.

Austin.$379 per passenger.Departing Fri, Mar 12, returning Mon, Mar 15.Round-trip flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departing from St Louis on Fri, Mar 12, arriving in Austin-Bergstrom.Inbound indirect flight with Southwest Airlines, departing from Austin-Bergstrom on Mon, Mar 15, arriving in St Louis.Price includes taxes and charges.From $379, select.

Austin.$429 per passenger.Departing Fri, Sep 25, returning Sun, Sep 27.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from St Louis on Fri, Sep 25, arriving in Austin-Bergstrom.Inbound indirect flight with Frontier Airlines, departing from Austin-Bergstrom on Sun, Sep 27, arriving in St Louis.Price includes taxes and charges.From $429, select.

Austin.$595 per passenger.Departing Fri, Sep 25, returning Sat, Oct 3.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from St Louis on Fri, Sep 25, arriving in Austin-Bergstrom.Inbound indirect flight with Frontier Airlines, departing from Austin-Bergstrom on Sat, Oct 3, arriving in St Louis.Price includes taxes and charges.From $595, select.

Austin.$713 per passenger.Departing Fri, Sep 25, returning Sat, Oct 3.Round-trip flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from St Louis on Fri, Sep 25, arriving in Austin-Bergstrom.Inbound direct flight with Southwest Airlines departing from Austin-Bergstrom on Sat, Oct 3, arriving in St Louis.Price includes taxes and charges.From $713, select.

Austin.$835 per passenger.Departing Thu, Sep 24, returning Fri, Sep 25.Round-trip flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from St Louis on Thu, Sep 24, arriving in Austin-Bergstrom.Inbound direct flight with Southwest Airlines departing from Austin-Bergstrom on Fri, Sep 25, arriving in St Louis.Price includes taxes and charges.From $835, select.

Find the cheapest month to fly from St Louis to Austin-Bergstrom

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like St Louis to Austin-Bergstrom flights are currently cheapest in October.

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Direct flights from St Louis to Austin-Bergstrom

St Louis to Austin-Bergstrom: Alternative routes

Compare routes from St Louis to Austin below. You may find an airport to fly into that's cheaper, faster, or easier than Austin-Bergstrom.

Austin-Bergstrom

10km from central Austin

ClosestCheapest

from $125

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Killeen Gray AAF

88km from central Austin

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St Louis to Austin: Flight information

The things to know before you go.

Cheapest flight found	$125
Cheapest month to fly	October
Average flight time	2 hrs, 9 mins
Most popular airline	Southwest Airlines
Average flights per week	21

Finding cheap flights from St Louis to Austin-Bergstrom: Frequently asked questions

How much are round-trip flights from St Louis to Austin-Bergstrom?

The best price we found for a round-trip flight from St Louis to Austin-Bergstrom is $125. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

How long does it take to fly from St Louis to Austin-Bergstrom?

2 hours and 9 minutes is the average flight time from St Louis to Austin-Bergstrom.

Which airlines fly direct from St Louis to Austin-Bergstrom?

Southwest Airlines flies direct from St Louis to Austin-Bergstrom.

How many flights are there a week from St Louis to Austin-Bergstrom?

There are 21 flights per week flying from St Louis to Austin-Bergstrom, as of September 2026.

When is the cheapest time to fly from St Louis to Austin-Bergstrom?

The cheapest month to fly from St Louis to Austin-Bergstrom is usually October.

Which upcoming date is cheapest to fly from St Louis Airport to Austin-Bergstrom Airport on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to Austin-Bergstrom Airport on Monday, October 26, 2026.

Can I get a direct flight from St Louis Airport to Austin-Bergstrom Airport?

Yes – the average flight time is 2 hours and 9 minutes.

How can I find the best flight deal to Austin-Bergstrom?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Austin-Bergstrom but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to Austin?

We crunched all the numbers in our flight calendar, and it looks like the cheapest time to book a flight to Austin is around 40 days in advance, so don’t leave your flight to the last minute.

Which is the cheapest airline to fly with from St Louis Airport to Austin-Bergstrom?

Currently, Frontier Airlines and Southwest Airlines offer the cheapest flight tickets to Austin-Bergstrom.

Flying from St Louis Airport (STL) to Austin-Bergstrom Airport (AUS): what you need to know

The average time for a direct flight from St Louis Airport to Austin-Bergstrom Airport is 2 hours 5 minutes.
St Louis and Austin are in the UTC-6 timezone. This means you won't have to change your watch when you arrive.
Every week, there are 11 St Louis Airport to Austin-Bergstrom Airport flights. If you prefer to take off as early as possible, pick the 06:10 Southwest Airlines flight. If you'd rather make the most of your day before you fly, the last departure is at 22:45 with Southwest Airlines.
Arrive at the airport on time so you don't miss your STL to AUS flight. Be there at least two hours ahead for international flights and an hour early for domestic departures to avoid the stress of rushing.
During popular months like July, it's best to get to the airport earlier than normal. Plan to arrive two hours before a domestic departure and four hours ahead of an international flight whenever you're flying during peak periods in general.
Southwest Airlines is your ticket to exploring Austin (and perhaps some other exciting parts of the United States!). Check out the direct flights from St Louis Airport to Austin-Bergstrom Airport offered by this airline.
The majority of passengers choose to fly with Southwest Airlines on this route.
The most punctual carrier that operates STL to AUS flights is Southwest Airlines. Its services land as planned 75.47% of the time.
We make it a cinch to book a flight with a stopover. To see your options for tickets from St Louis Airport to Austin-Bergstrom Airport, deselect 'Direct flights only.' Then, pick a flight offering a stop long enough to tour your chosen city. Popular stopovers between STL and AUS include:
- Kansas City International Airport
- Dallas Love Field Airport
- Tulsa International Airport

How to find the cheapest flights from St Louis Airport (STL) to Austin-Bergstrom Airport (AUS)

The cheapest price we've found for a one-way St Louis Airport to Austin-Bergstrom Airport flight is $69. A round-trip plane ticket is currently $125. Depending on the availability when you book, these fares may change.
It's often best to book as early as possible if you're hoping to get cheap tickets from STL to AUS. That's because airlines change prices based on demand, which tends to rise closer to departure.
Plan your trip for May. That's the cheapest month for flights from St Louis Airport to Austin-Bergstrom Airport. If you're flexible with your dates, use the 'Whole month' tool to see the cheapest airfare across each month.
Spend less time searching for cheap flights from STL to AUS by setting up a Price Alert. You'll get an email or notification through the app when a new discounted fare appears.
Tailor your trip using filters. Pick your preferred arrival and departure times, total journey duration and airlines. You can also sort the results by 'Cheapest,' 'Fastest' or 'Best' flights from St Louis Airport to Austin-Bergstrom Airport.

Handy information about St Louis Airport (STL)

You'll find STL at 10701 Lambert International Blvd..
When it comes to the on-time performance of St Louis Airport, data shows 76% of flights complete their journey on time.
St Louis Airport is about 24 kilometers from central St Louis. If you're driving, ride-sharing or catching a cab from the center, it'll take 25 minutes or so to arrive, depending on the traffic.
The journey on public transport will take about 30 minutes.
Have an early flight from St Louis Airport to Austin-Bergstrom Airport? Avoid the last-minute rush to the terminal (and sneak in some extra snooze time) by choosing one of these hotels close to STL:

Arriving at Austin-Bergstrom Airport (AUS)

The last thing you want is a lengthy trip to your hotel if you're arriving on a late St Louis Airport to Austin-Bergstrom Airport flight. Book one of these accommodation options near AUS instead:
Begin your adventure by picking up a Austin-Bergstrom Airport rental car. Grab your wheels from Thrifty, Dollar or Easirent to explore Austin and beyond.
To lock in the lowest price, book your vehicle from Austin-Bergstrom Airport around four weeks ahead.

When to fly to Austin-Bergstrom Airport (AUS)

It's time to plan your dates for your flight from St Louis Airport to Austin-Bergstrom Airport. July is the busiest month to visit Austin. If you prefer a more laid-back vibe, go in March.
Lock in your flight from St Louis Airport to Austin-Bergstrom Airport for August if you want to visit Austin during its warmest month. Expect temperatures of between 23ºC (73ºF) and 41ºC (106ºF).
If you want cooler conditions, search for a cheap ticket from STL to AUS in January. Temperatures average between 3ºC (37ºF) and 19ºC (66ºF) then.

Explore more of the United States

You've visited Austin, now it's time to discover more of the United States. Travel about 241 kilometers east to Houston to check off its top sights. From The Museum of Fine Arts, Houston, Beck Building to Houston Museum of Natural Science and The Menil Collection, you'll have a full itinerary ahead.
San Antonio is another well-known destination in the United States and is around 121 kilometers south-west of Austin. No journey is complete without experiencing San Antonio River Walk, San Antonio River walk and Alamo Plaza.