STL - AUS

$70 Find Cheap Flights from St. Louis to Austin

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Austin departing on 5/17. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Austin

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Austin, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Austin, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$140
Typical prices: $374-$227
Frontier
Thu 5/14Mon 5/18
STL - AUS • 1 stop
Cheapest non-stop
$174
Typical prices: $468-$273
Southwest
Tue 4/21Tue 4/28
STL - AUS • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
Avoid peak hours at STL to skip long security lines.
Use CapMetro’s Bus Route 20 for a budget ride from AUS.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Cheapest • from $140 (round-trip)
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with Southwest. Average duration is 2h 12m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $184 (round-trip)
Shortest trip • 3h 52m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 45% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 24% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Austin!
Flight Deals
Booking Insights
Expert advice
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Austin that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from St. Louis to Austin

Thu, May 14 - Mon, May 18
Frontier Logo
12:16 pm - 9:47 pm
STL
-
AUS
9h 31m
1 stop
Frontier Logo
11:30 am - 12:21 am
AUS
-
STL
12h 51m
1 stop
$140Frontier
Thu, May 7 - Sun, May 10
Frontier Logo
8:08 pm - 8:18 pm
STL
-
AUS
24h 10m
1 stop
Frontier Logo
9:13 pm - 7:23 pm
AUS
-
STL
22h 10m
1 stop
$162Frontier
Tue, May 26 - Mon, Jun 1
Frontier Logo
8:08 pm - 9:43 am
STL
-
AUS
13h 35m
1 stop
Frontier Logo
9:13 pm - 7:23 pm
AUS
-
STL
22h 10m
1 stop
$168Frontier
Wed, Apr 29 - Tue, May 5
Delta Logo
1:03 pm - 7:46 pm
STL
-
AUS
6h 43m
1 stop
Delta Logo
6:39 pm - 11:36 pm
AUS
-
STL
4h 57m
1 stop
$171Delta
Tue, Apr 21 - Tue, Apr 28
Southwest Logo
8:55 pm - 11:05 pm
STL
-
AUS
2h 10mnonstop
Southwest Logo
7:30 am - 9:35 am
AUS
-
STL
2h 05mnonstop
$174Southwest
Tue, Apr 21 - Tue, Apr 28
Delta Logo
4:41 pm - 12:17 am
STL
-
AUS
7h 36m
1 stop
Delta Logo
1:55 pm - 9:19 pm
AUS
-
STL
7h 24m
1 stop
$176Delta
Tue, Apr 21 - Tue, Apr 28
Southwest Logo
8:55 pm - 11:05 pm
STL
-
AUS
2h 10mnonstop
Southwest Logo
3:05 pm - 9:10 pm
AUS
-
STL
6h 05m
1 stop
$178Southwest
Tue, Apr 21 - Tue, Apr 28
Southwest Logo
2:30 pm - 4:40 pm
STL
-
AUS
2h 10mnonstop
Southwest Logo
3:50 pm - 6:00 pm
AUS
-
STL
2h 10mnonstop
$180Southwest
Thu, May 7 - Mon, May 11
Frontier Logo
8:08 pm - 8:18 pm
STL
-
AUS
24h 10m
1 stop
Frontier Logo
10:42 pm - 6:06 pm
AUS
-
STL
19h 24m
1 stop
$181Frontier
Tue, Apr 21 - Tue, Apr 28
Southwest Logo
5:40 pm - 11:20 pm
STL
-
AUS
5h 40m
1 stop
Southwest Logo
4:10 pm - 9:15 pm
AUS
-
STL
5h 05m
1 stop
$182Southwest
Booking Insights

KAYAK's insights & trends for St. Louis to Austin flights

Get data-powered insights and trends into flights from St. Louis to Austin to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from St. Louis to Austin?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from St. Louis to Austin departing in May.

What’s the cheapest day of the week to fly from St. Louis to Austin?

The average price of all round-trip flights from St. Louis to Austin clicked on KAYAK for each day over the last 12 months.

If you are looking for a flight deal from St. Louis to Austin, look for departures on Thursdays and avoid leaving on a Sunday, as it's usually the priciest day. When flying back from Austin, Tuesday is the cheapest day to fly and Sunday is the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Austin, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from St. Louis to Austin is September, where tickets cost $236 (return) on average. On the other hand, the most expensive months are March and December, where the average cost of round-trip tickets is $434 and $339 respectively.

Can I save money by flying with a layover from St. Louis to Austin?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $397 on average.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from St. Louis to Austin, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from St. Louis to Austin, you should book around 4 weeks before departure, which saves you about 45% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 21 weeks before departure.

Expert advice

Expert advice for your flight from St. Louis to Austin

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Yulia Denisyuk

Yulia Denisyuk

Expert on STL

Yulia is a freelance journalist who’s dispatched from 90+ countries. Her work focuses on cultures, adventure trips and air travel, appearing in NatGeo, NYT, CNTraveler, and more. For past assignments, she’s stayed with nomads in Mongolia and learned the art of Imigongo in Rwanda. She’s based in Chicago; in winter she often questions that decision.

Harriet Baskas

Harriet Baskas

Expert on AUS

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Good to know

Low seasonSeptember
Cheapest flight$70
Best time to beat the crowds with an average 25% drop in price.
Most popular time to fly with an average 39% increase in price.
Flight from St. Louis to Austin

When to book flights from St. Louis to Austin

Are your dates flexible? Find out the best times to travel from St. Louis to Austin based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from St. Louis to Austin

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

    In the last 3 days, the lowest price for a flight from St. Louis to Austin was $70 for a one-way ticket and $140 for a round-trip.

  • Do I need a passport to fly between St. Louis and Austin?

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

  • Which airlines offer Wi-Fi service onboard planes from St. Louis to Austin?

    JetBlue, Delta, American Airlines, and Alaska Airlines offer inflight Wi-Fi service on the St. Louis to Austin flight route.

  • Which aircraft models fly most regularly from St. Louis to Austin?

    The Boeing 737 MAX 8 is the aircraft model that flies most regularly on the St. Louis to Austin flight route.

  • Which airline alliances offer flights from St. Louis to Austin?

    SkyTeam, Star Alliance, and oneworld are the airline alliances operating flights between St. Louis and Austin, with SkyTeam being the most commonly used for this route.

  • On which days can I fly direct from St. Louis to Austin?

    There are nonstop flights from St. Louis to Austin on a daily basis.

  • Which is the best airline for flights from St. Louis to Austin, Southwest or Delta?

    The two airlines most popular with KAYAK users for flights from St. Louis to Austin are Southwest and Delta. With an average price for the route of $333 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $290 and an overall rating of 7.9.

  • How does KAYAK find such low prices on flights from St. Louis to Austin?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Austin.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Austin?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Austin from St. Louis is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Austin?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Austin with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and AUS can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Austin?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Austin from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from St. Louis to Austin

  • Looking for a cheap flight? 25% of our users found flights on this route for $124 or less one-way and $293 or less round-trip.

Prefer to fly direct from St. Louis to Austin?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Lambert-St Louis to Austin Bergstrom.
Find which airlines fly direct from Lambert-St Louis Airport to Austin Bergstrom Airport, which days they fly and book direct flights.

Direct departures

Lambert-St Louis to Austin Bergstrom

Monday

Southwest

Southwest

Tuesday

Southwest

Southwest

Wednesday

Southwest

Southwest

Thursday

Southwest

Southwest

Friday

Southwest

Southwest

Saturday

Southwest

Southwest

Sunday

Southwest

Southwest

See more direct flights

Direct returns

Austin Bergstrom to Lambert-St Louis

Monday

Southwest

Southwest

Tuesday

Southwest

Southwest

Wednesday

Southwest

Southwest

Thursday

Southwest

Southwest

Friday

Southwest

Southwest

Saturday

Southwest

Southwest

Sunday

Southwest

Southwest

See more direct flights

Reviews of the top 4 airlines serving from St. Louis to Austin

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Austin. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Austin? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4333 reviews
8.0Comfort
8.1Boarding
7.0Food
7.5Entertainment
8.6Crew
Airline reviews

I elected to pay for the upgrades and found very little difference

6.0 GoodChris, Mar 2026
DAL - SAT
Read more Southwest reviews

I elected to pay for the upgrades and found very little difference

The new seating arrangement is so over priced for what you get.

Snacks are always pretzels. Why can't you also offer peanuts ?

Flight was hours late, unable to sit next to spouse, I have had so much better experiences. Substantially better, only saving grace was that it was a short flight.

An entire day of delays. Cost lots of money. Meals and a hotel.

Only downside was the legroom and seat width, which is always a problem unless I spend more for a premium seat.

Great flight but super high price. Glad it was a business trip and not personal

On time. Friendly staff. Took to long to pre bord all the specialty groups. Cramped small plane

No delays and arrived to destination 30 min early. Staff was super friendly.

Everything a cheap airline should be at normal airline rates.

The first class flight attendant was awful to everyone. Very rude; no customer service. She should not be working in first class.

Snacks and included beverages were appreciated. Boarding went smoothly. Plenty of overhead bin space. Seats get very uncomfortable after a couple of hours. After waiting 10 painful minutes for my walker, a very nice Delta guest agent pushed me in a wheelchair to the gate. It was finally delivered to me after another 15 minutes . Our checked bag was on the carousel long b4 I was able to retrieve it. Fortunately it was still there but somewhere along the way the straps we used to secure it were removed and and were not reattached. Wish I had made note of the agents name.

It was fine. 55 minute flight. No snacks or beverage service offered. Boarding went smoothly and my walker was waiting for me on the jet way.

Smaller plane for a longer flight than my first one. Doesn’t make sense.

The cabin temperature was nice and cool. The wifi was not working.

Flight late, the waited for a long time for “personal” to arrive at gate to dock the plane in Rochester. So annoying. This flight was expected, why aren’t personel available for the jet bridge?

As previously noted, this flight was great: departure was timely, the crew was friendly and attentive, and wifi connectivity was seamless. In particular, I appreciated that the flight attendant just told me to stow the laptop right before takeoff/landing, and trusted me to do so (which I did!).

Kayak botched up the booking, i had to call delta and fix. In the process Delta failed to honor my comfort plus seat assignment that i had previously.

Entertainment is ok! Boarding and seat with zone is terrible. I paid for the seats but you didn’t give me what I paid for which is exit isles.

the crew cancel the morning service due to the weather. Then the flight got deverted to Nashville . we were on the ground for over two hours the only gave us water once... no food or any snacks.... the crew should have handled better and offered something to passengers.

It isvvery small flight. No leg room . No space to put my personal item at feet.

My flight was canceled a few hours before boarding. I was rebooked on Copa airlines and missed an important meeting .

Everything was on time and service on the flight was great!

The travel company that you have on your site did me so wrong. I don’t know how it happened, but they put my son‘s name on my plane ticket flying to Vietnam. Along with his birthday. They would not have let me fly from Fort Myers to Ho Chi Minh City. I don’t think that I can ever use your service again. I typed my information into the browser along with my passport number and four days before I’m leaving I have to quickly search another ticket to fly out here.

Good flight. Efficient boarding and competent flight crew. No problems until we arrived at our destination gate. We were early so there was an aircraft at the gate that had to move before we could pull in. Then, due to the type of aircraft we flew, the cabin door could not be opened until some luggage from the cargo bay was offloaded to preserve center of gravity characteristics. So, that further delayed deplaning. Despite being 20 minutes early on landing, we ended up being 5 to 10 minutes late after all the delays.

This trip did not start off well. The inbound flight was delayed about 20 minutes. Then, after initial onboarding, the passengers had to deplane due to a mechanical problem. That took about 30 minutes to fix and be cleared. Then, reboarding was chaotic. It took a long time to sort passengers and two passengers on standby were ticketed but there was no seat. So, they had to deplane. One of the flight crew was trying to help passengers figure out a place to put their carry-on bags and that took more time. In the end, our scheduled 10:30 am departure did not actually take off until about 12:05 pm CST. The flight itself was long but we got to Houston. Some passengers missed their connecting flights and had to rebook. Not the best of flights I've had.

Complimentary light meal would be appreciated. But great flight crew service on all legs

Everything was great except for the boarding process. Everyone is lining up all at the same time and it’s hard to tell between the groups as they are way too large.

Very old flight - time to retire it for newer airplanes

Do not like the size of the overhead bin. I think staff should monitor the size of suitcases that are being carried on by passengers to ensure they meet the size requirement.

Terrible planning. And even worse gate agents. Absolutely rude behavior.

Rough flight No beverage service due to turbulence Bottom Seat cushion was non existent

They put me on an earlier and I got home sooner

Not good. One of my luggage is missing. And until now they can’t find it

Delay after delay with little communication then AA lost my luggage and at airport would not assist just said scan this QR code to track your luggage and submit a claim. However QR code provided did not work so have to go back to airport

Where do I start!! I was delayed with my flight from Dallas to Tampa. On the way back from Tampa to Dallas the flight was delayed over 4 hours+. I was put on another flight that was also delayed but not as long. Traveling on American Airlines is becoming exhausing.

Dloght delayed by 2.5 hrs . Common theme in my last four american floghts

The flight attendants and the service is getting worse by the day.

They are rarely on time! Very hard to plan your travels when flights or connections keep getting delayed.

Forced to check bags. Crew uninterested in collecting trash. Unclean seats.

Everything you need to know for your flight from St. Louis to Austin

Other airlines flying from St. Louis to Austin

Flights from the other most popular airlines that fly from St. Louis to Austin according to KAYAK users. Prices are the lowest found on KAYAK over the last 7 days. Price and availability are not guaranteed.