STL - AUS

$78 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 5/19. 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
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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: $378-$231
Frontier
Thu 5/14Mon 5/18
STL - AUS • 1 stop
Cheapest non-stop
$174
Typical prices: $378-$235
Southwest
Tue 5/19Tue 5/26
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 10m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $184 (round-trip)
Shortest trip • 3h 51m (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 27% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 26% 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
12:36 pm - 9:47 pm
STL
-
AUS
9h 11m
1 stop
Frontier Logo
11:18 am - 12:21 am
AUS
-
STL
13h 03m
1 stop
$140Frontier
Tue, May 19 - Tue, May 26
Southwest Logo
2:30 pm - 4:40 pm
STL
-
AUS
2h 10mnonstop
Southwest Logo
7:30 am - 9:35 am
AUS
-
STL
2h 05mnonstop
$174Southwest
Tue, May 19 - Tue, May 26
Southwest Logo
6:40 pm - 11:00 pm
STL
-
AUS
4h 20m
1 stop
Southwest Logo
7:30 am - 9:35 am
AUS
-
STL
2h 05mnonstop
$178Southwest
Fri, May 8 - Mon, May 11
Frontier Logo
4:19 pm - 10:45 am
STL
-
AUS
18h 26m
1 stop
Frontier Logo
10:42 pm - 6:06 pm
AUS
-
STL
19h 24m
1 stop
$179Frontier
Sun, May 10 - Wed, May 27
Frontier Logo
12:36 pm - 9:47 pm
STL
-
AUS
9h 11m
1 stop
Frontier Logo
10:52 pm - 8:26 pm
AUS
-
STL
21h 34m
1 stop
$180Frontier
Wed, Sep 9 - Wed, Sep 16
American Airlines Logo
9:46 am - 2:35 pm
STL
-
AUS
4h 49m
1 stop
American Airlines Logo
7:50 pm - 11:41 pm
AUS
-
STL
3h 51m
1 stop
$181American Airlines
Tue, May 19 - Tue, May 26
Southwest Logo
2:30 pm - 4:40 pm
STL
-
AUS
2h 10mnonstop
Southwest Logo
4:00 pm - 8:00 pm
AUS
-
STL
4h 00m
1 stop
$184Southwest
Tue, May 19 - Tue, May 26
Southwest Logo
8:55 pm - 11:05 pm
STL
-
AUS
2h 10mnonstop
Southwest Logo
7:30 am - 9:35 am
AUS
-
STL
2h 05mnonstop
$186Southwest
Tue, May 19 - Tue, May 26
American Airlines Logo
5:20 am - 10:36 am
STL
-
AUS
5h 16m
1 stop
American Airlines Logo
7:50 pm - 11:59 pm
AUS
-
STL
4h 09m
1 stop
$187American Airlines
Tue, May 19 - Tue, May 26
Southwest Logo
8:25 am - 1:35 pm
STL
-
AUS
5h 10m
1 stop
Southwest Logo
4:50 pm - 10:20 pm
AUS
-
STL
5h 30m
1 stop
$188Southwest
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 Saturdays 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 April, where the average cost of round-trip tickets is $429 and $350 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.

No, with an average price for the route of $350, prices are generally cheapest when you fly direct.

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 27% 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$78
Best time to beat the crowds with an average 26% drop in price.
Most popular time to fly with an average 35% 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 $78 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 $341 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 $348 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 $178 or less one-way and $311 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 4327 reviews
8.1Boarding
8.0Comfort
7.5Entertainment
8.6Crew
7.0Food
Airline reviews

Southwest is kind of a slum airline. It’s gotten more expensive over the years for less and less service. I am a Southwest Chase Visa card holder and was forced to choose a seat in the 26th row in the middle seat. However my wife who is a rewards member but doesn’t hold a card or anything else, gets randomly assigned a normally paid seat in row 6! How does that work?

4.0 OkayDavid, Apr 2026
COS - DAL
Read more Southwest reviews

Southwest is kind of a slum airline. It’s gotten more expensive over the years for less and less service. I am a Southwest Chase Visa card holder and was forced to choose a seat in the 26th row in the middle seat. However my wife who is a rewards member but doesn’t hold a card or anything else, gets randomly assigned a normally paid seat in row 6! How does that work?

The seat was not comfortable. 1D. My back was sore all night and the next day.

One of the best airlines for fast boarding, on time arrivals, and top notch service!

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

This wasn't my experience with Delta. It was just the Pegasus flight. Seats were very hard. Staff was kinda rough. Not very nice. Charged me for snacks. For a 4 hour flight I would've expected more.

Crew was nice, meal was good. Entertainment had to be rebooted 3 times and still did not work. Turns out there was residue on screen, it needed to be cleaned to prevent the touchscreen buttons from continuously activating. I had entertainment for the last 45 minutes of a 5 hour 45 minute flight. Really unacceptable for first class. Flight attendent indicated your cleaning solution creates this problem. Seems as if this is widely known, you should be using a different product or cleaning better. Really really disappointing which simply added to the wi fi on your planes with reliably never ever works.

The baggage belt was not updated on the Delta App and was displayed on the wrong belt board. Was not expecting this to happen.

The plan was delayed and left DC 90 minutes late. However, it showed a 20 minute delay on the delta app, then a 12 min delay. It turned out to be an hour delay. I found out where the plane was with flightaware. Stop keeping customers in the dark about what is going on.

Everything went smoothly, although the usual gripes about airline travel were still present: the boarding process is inefficient, the snack selection is limited, and so on. Since there was extra space on the flight, the gate agent rearranged many people's seats to put people on the aisles and windows, leaving the middle seats empty, as much as possible, which was pretty great.

Landed without a gate ready. Plane is extremely old and dirty.

All the amenities was wonderful, if they could keep their prices that low. I'd fly with them all the time.

Very old plane with no inflight entertainment. I purchased the internet pass and it was nearly unusable.

My tray was broken so i had no place to work or eat except my lap. Flight attendant said I would get an email with some credit or miles, it was a complete waste of time as I could only function at about 20% of normal. I have not received anything yet.

Short trip, no food and therefore no expectation for much interaction with staff who were pleasant and professional. My critique is on comfort of the seats. Exit rows and comfort seats do not provide enough personal space for 3 side-by-side seats, especially when in the middle row. Some passengers are not considerate of the middle seat and there should be signs that state something to the effect of: "please consider giving middle seats use of the armrests."

Overall flight was ok. Flight attendant was receptive to assisting passengers with tight connections.

This was the first flight in the morning. We boarded fine. The cabin door was closed and we were ready to go. We were notified by the Captain that ATC issued and ground stop for 40 minutes. So, without even pushing back from the gate, we were already 40 minutes late. We actually were released to push-back and taxi at 30 minutes. But, some passengers had tight connections and were not going to make their connections. Some passengers asked about the delay and the effect on the connections and were told by the cabin attendant that all flights will be delayed and so they should be OK. However, that was not true. My connecting flight was on time and I arrived at IAH with 21 minutes to make my connection. I did and I'm happy about that, but the flight crew should not have given assurances to the passengers who might have missed their connections.

Boarding was again a "free for all". We were boarding group 4, and almost the entire plane was able to board before us. It's a shame that someone who follows the rules, gets the short end of the stick. Not fair.

Fine. The issues I had were associated with luggage being delayed from Turkey to Tanzania

We purchase first class seats for the first time for multiples of standard economy ticket. There was no access to the club lounge and no priority boarding. The meal and the service once on the plane were superior and the seat was nicer, but not worth the price difference. I will be happy to seat in economy and spend the difference on more travel.

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.

American delayed the flight for a crew rest period. The delay occurred late in the evening - the earliest i can find is 10:20 pm. With a 6 am flight anyone on the flight would have already have been asleep (unless you are insane, a vampire or on drugs) and at least for me i was already on the way to the airport at 445 am the next morning when i discovered they delayed the flight until 9 am. Given the incoming flight was in the air at 6 pm the evening before this should have been figured out a lot more timely that was there only crew to use. Just frustrating given there is no consideration for customer experience anymore in flying.

Got home at 3am after deboarding the plane. No compensation offered by American

Flights on time w/o delays. However, my baggage was damaged. Ground crew, throws baggage from plane to the baggage carrier, carelessly.

Business class was very good, one of my best flights

American flight was diverted and delayed but app didn’t show that information so I wasn’t able to change my connection until the last min.

The plane was very creaky and lots of ringing. Plane was dirty and dingy. I couldn't hear the captain's announcements from the flight deck. Not sure if it was the captain or the audio equipment, but good thing there wasn't an emergency where we needed clear instructions. The overhead compartments were clearly full, but the flight crew allowed people to stand in the back with their carry on luggage. Then after everyone boarded, they had to go to the front to gate check their luggage because there was no room for their bags and then they returned to their seats...such a waste of time when clearly the overhead compartments were full when they originally boarded.

Air condition was not working for long both after boarding and also after landing ; unbearably hot and suffocating

Human interaction. Thought there would be more service-even a smile would have been nice.

It was canceled at the last minute. While I was literally at the airport. Messed my entire trip up.

Moved to earlier flight which unexpectedly had maintenance issues initially indicated as quick fix to ultimately plane changes. Moved back to original flight, also delayed. In all cases customer updates and communication very unclear, no updates on drivers for delays.

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.