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$100 Cheap Flights from Austin (AUS) to St. Louis (STL)

View $100 flight on Sat, Nov 7, 2026Opens 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 $100 for one-way flights and $200 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Thu, Oct 1 - Sun, Oct 4
AUS
Austin
STL
St. Louis
$200 Roundtrip, just found
$200
Roundtrip
just found
Select Frontier Airlines flight, departing Thu, Oct 1 from Austin to St. Louis, returning Sun, Oct 4, priced at $200 just found
Frontier Airlines
Thu, Nov 19 - Thu, Nov 26
AUS
Austin
STL
St. Louis
$209 Roundtrip, found 21 hours ago
$209
Roundtrip
found 21 hours ago
Select Frontier Airlines flight, departing Thu, Nov 19 from Austin to St. Louis, returning Thu, Nov 26, priced at $209 found 21 hours ago
Frontier Airlines
Fri, Nov 13 - Tue, Nov 17
AUS
Austin
STL
St. Louis
$209 Roundtrip, found 2 days ago
$209
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Fri, Nov 13 from Austin to St. Louis, returning Tue, Nov 17, priced at $209 found 2 days ago
Frontier Airlines
Sat, Nov 14 - Sun, Nov 15
AUS
Austin
STL
St. Louis
$210 Roundtrip, just found
$210
Roundtrip
just found
Select Frontier Airlines flight, departing Sat, Nov 14 from Austin to St. Louis, returning Sun, Nov 15, priced at $210 just found
American Airlines
Fri, Sep 4 - Thu, Sep 10
AUS
Austin
STL
St. Louis
$214 Roundtrip, found 3 days ago
$214
Roundtrip
found 3 days ago
Select American Airlines flight, departing Fri, Sep 4 from Austin to St. Louis, returning Thu, Sep 10, priced at $214 found 3 days ago
Frontier Airlines
Fri, Oct 16 - Tue, Oct 20
AUS
Austin
STL
St. Louis
$219 Roundtrip, found 2 days ago
$219
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Fri, Oct 16 from Austin to St. Louis, returning Tue, Oct 20, priced at $219 found 2 days ago
Southwest Airlines
Fri, Sep 4 - Thu, Sep 10
AUS
Austin
STL
St. Louis
$219 Roundtrip, found 3 days ago
$219
Roundtrip
found 3 days ago
Select Southwest Airlines flight, departing Fri, Sep 4 from Austin to St. Louis, returning Thu, Sep 10, priced at $219 found 3 days ago
Frontier Airlines
Thu, Sep 10 - Sun, Sep 13
AUS
Austin
STL
St. Louis
$222 Roundtrip, just found
$222
Roundtrip
just found
Select Frontier Airlines flight, departing Thu, Sep 10 from Austin to St. Louis, returning Sun, Sep 13, priced at $222 just found
Delta
Tue, Nov 17 - Thu, Nov 26
AUS
Austin
STL
St. Louis
$258 Roundtrip, just found
$258
Roundtrip
just found
Select Delta flight, departing Tue, Nov 17 from Austin to St. Louis, returning Thu, Nov 26, priced at $258 just found
Alaska Airlines
Sun, Sep 6 - Wed, Sep 9
AUS
Austin
STL
St. Louis
$767 Roundtrip, found 13 hours ago
$767
Roundtrip
found 13 hours ago
Select Alaska Airlines flight, departing Sun, Sep 6 from Austin to St. Louis, returning Wed, Sep 9, priced at $767 found 13 hours ago

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 $333
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $333

What you need to know for your flight from Austin-Bergstrom Intl. to Lambert-St. Louis Intl.

Austin (AUS) to St. Louis (STL) at a glance

Travel from Austin (AUS) to St. Louis (STL) with a selection of airlines on this domestic short-haul route. You can explore options from both full-service and low-cost carriers to discover the best itinerary that suits your budget and schedule. As you plan your visit to St. Louis's iconic attractions and vibrant neighborhoods, be sure to check out the key details for flights departing from Austin-Bergstrom International Airport (AUS) to Lambert-St. Louis International Airport (STL).

  • Fastest flight duration: around 2 hours non-stop
  • Route distance: roughly 700 miles (1,130 km)
  • Flights per week: around 15+ flights with multiple daily departures on average
  • Typical fares (one-way): economy tickets often range from $90–$385, depending on seasonality and how far ahead you book

Flights from Austin-Bergstrom International Airport (AUS) to Lambert-St. Louis International Airport (STL)

Based on the latest traveler bookings, here are the top airlines favored for flights from Austin to St. Louis, particularly for non-stop and one-stop options. Popular layover choices include Dallas-Fort Worth International Airport (DFW, approximately 1-hour layover), Love Field Airport (DAL, about 1 hour and 15 minutes layover), and George Bush Intercontinental Airport (IAH, also around 1 hour and 15 minutes layover). These routes offer the flexibility to balance your budget, total travel time, and cabin class, helping you select the ideal itinerary.

  • Southwest Airlines: This budget-friendly airline provides both non-stop and one-stop flights, with one-way ticket prices generally between $90 and $385. It is responsible for about 63% of the departures for this route, and the typical non-stop travel time is around 2 hours.
  • American Airlines: Known for its comprehensive service, American Airlines offers one-stop journeys with one-way fares usually spanning from $95 to $385. It makes up roughly 26% of the departures on this route, featuring an in-flight duration of 3 hours and a total travel time of about 4 hours and 15 minutes, including layovers.
  • United: Another full-service option, United provides one-stop services with one-way fares typically ranging from $115 to $325. It accounts for approximately 7% of the departures on this route, with an in-flight time of 3 hours and a full journey duration of around 4 hours and 15 minutes, factoring in layovers.
  • Delta: Delta offers one-stop flights and is a well-regarded full-service airline, with one-way fares generally priced between $100 and $390. It comprises about 4% of the departures for this route, featuring an in-flight time of 3 hours and a total travel duration of roughly 4 hours and 15 minutes, including a layover.
  • Frontier Airlines: This low-cost carrier provides one-stop service, with one-way fares typically ranging from $90 to $165. Frontier accounts for around 1% of departures on this route, featuring an in-flight duration of 3 hours and a total journey time of approximately 4 hours and 15 minutes, including layovers.

Travelers flying from Austin to St. Louis can opt to enhance their journey with an upgrade, as American Airlines provides first-class service on this route.

Best time to fly from Austin (AUS) to St. Louis (STL)

The most popular months for travelers flying from Austin to St. Louis are February, March, and April, when peak temperatures in St. Louis reach up to 56.1°F in April. If you prefer quieter travel, consider August, the least busy and relatively cheaper time to visit with fewer crowds and temperatures around 77°F. For better deals, September usually offers the lowest average one-way fare around $187. Flight availability peaks in September, November, and December, with approximately 19 flights per week, making it easier to find convenient departure times. January has the fewest flights, with approximately 12 flights per week.

  • Cheapest time to fly: September usually offers good deals with average one-way fare around $187, roughly 6% cheaper than the yearly average.
  • More budget-friendly months to fly: October, August, and December typically offer average one-way fares of around $192.
  • Most flight options: September, November, and December have the highest number of flights from Austin to St. Louis, with approximately 19 flights per week, giving you more flexibility in scheduling your trip.
calendar iconMonthtemperature iconTemperaturecrowd level iconDemandflights iconWeekly Flightsprice iconAverage one-way Fare
January31.6°F (-0.2°C)Low12$207
February34.9°F (1.6°C)High17$206
March46.4°F (8.0°C)High18$215
April56.1°F (13.4°C)High18$199
May66.6°F (19.2°C)Low15$195
June76.1°F (24.5°C)Average17$194
July78.6°F (25.9°C)Average17$195
August77.0°F (25.0°C)Low16$191
September70.9°F (21.6°C)Average19$187
October58.6°F (14.8°C)Average16$189
November46.2°F (7.9°C)Average19$222
December37.8°F (3.2°C)Average19$194

*Average one-way fare is based on Expedia flight booking data from January 2025 to April 2026 for the specified route and travel class and may change depending on availability, dates, and demand.

Alternative route from Austin (AUS) to St. Louis (STL)

  • San Antonio to St. Louis (SAT-STL): San Antonio International Airport (SAT) is located roughly 67 miles from Austin-Bergstrom International Airport (AUS). One-way economy ticket prices for this route generally fall between $100 and $415, influenced by the season and how early you make your reservation. Travelers can choose from both non-stop and one-stop flight options, with popular layover points at Dallas-Fort Worth International Airport (DFW) and George Bush Intercontinental Airport (IAH). Major airlines operating on this route include low-cost Southwest Airlines and American Airlines. Additionally, first-class service is offered for those seeking premium travel experiences.

How to find the best prices for flights from Austin (AUS) to St. Louis (STL)

Getting some of the best deals on flights from Austin to St. Louis is all about timing and flexibility. Here are some key tips to help you save:

  1. Best times to book and fly: cheaper fares are usually found when booking at least two months in advance, although most travelers tend to book 2-8 weeks ahead. Afternoon departures, between 12 PM and 6 PM, often provide lower prices and are also the most popular times to fly. Additionally, traveling on Tuesday generally offers better deals, while Friday remains the busiest travel day.
  2. Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
  3. Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.*
  4. Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
  5. Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
  6. Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.

*Members only. Savings vary and are not available on all bundles. Select hotels.

Arriving at Lambert-St. Louis International Airport from Austin-Bergstrom International Airport

St. Louis welcomes travelers from Austin with a range of transport options based on price, convenience, and proximity. Here's how to reach St. Louis efficiently:

  • Hotel transfer: Transfers offer a convenient way to reach your hotel in St. Louis, with private rides that can be arranged in advance.
  • Car rental: Renting a car from Lambert-St. Louis International Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Lambert-St. Louis International Airport on Expedia.
  • Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
  • Public transportation: From Lambert-St. Louis International Airport, Lambert Main Terminal Station, a metro station, is conveniently located about 0.1 miles away on foot, providing easy access to public transportation.

Frequently asked questions

How much does a flight from Austin, TX (AUS-Austin-Bergstrom Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) cost?
You can find cheap one-way flights from $100 and cheap return flights from $200 Austin, TX (AUS-Austin-Bergstrom Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) with Expedia. One-way flights usually range from $144 to $613, and return flights typically cost between $266 and $916. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Austin, TX (AUS-Austin-Bergstrom Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Austin, TX (AUS-Austin-Bergstrom Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
September is the cheapest month to fly from Austin, TX (AUS) to St. Louis, MO (STL), with average round-trip fares around $268. This fare is about 19% lower than the average price throughout the year, as travel tends to slow down after the summer. Other budget-friendly months include April and May.*Averages based on flights available on Expedia in the last year.
Which airlines fly direct from Austin, TX (AUS-Austin-Bergstrom Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Enter AUS to STL and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from Austin, TX (AUS-Austin-Bergstrom Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Frontier Airlines is one of the cheapest airlines offering connecting flights from Austin, TX (AUS) to St. Louis, MO (STL), starting from around $108. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from Austin, TX (AUS-Austin-Bergstrom Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
To find a cheap flight from Austin, TX (AUS-Austin-Bergstrom Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from Austin, TX (AUS-Austin-Bergstrom Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The best airline to fly with from Austin, TX (AUS) to St. Louis, MO (STL) will differ from traveler to traveler. If you like to fly early, WN offers early morning flights. If price is the most important factor, WN typically offers the lowest fares. WN offers the most daily flights from AUS to STL, which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Austin, TX (AUS-Austin-Bergstrom Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
For flights from Austin, TX (AUS) to St. Louis, MO (STL), September and May are the best months to consider. September flights average around $268, making it an affordable choice. May also offers good pricing, allowing you to enjoy your trip without overspending.*Prices based on flights available on Expedia in the last year.
How many flights per day from Austin, TX (AUS-Austin-Bergstrom Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
You can find approximately 3 nonstop flights per day from Austin-Bergstrom Intl. (AUS) to Lambert-St. Louis Intl. (STL). For more options, look at flights that include layovers.
What is the earliest flight from Austin, TX (AUS-Austin-Bergstrom Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The earliest flight from Austin-Bergstrom International Airport (AUS) to Lambert-St. Louis International Airport (STL) typically departs at around 5:00 AM, operated by American Airlines. This seasonal service is available in February and December, allowing you to start your day early and maximize your time in St. Louis. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from Austin, TX (AUS-Austin-Bergstrom Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The most popular departure times for flights from Austin-Bergstrom International Airport (AUS) to Lambert-St. Louis International Airport (STL) are in the late afternoon, from 3pm to 6pm. About 25% of passengers prefer this time window. Many major carriers, including Southwest Airlines and American Airlines, offer flights during this window. This timing works well because it allows you to enjoy a full day in Austin before your flight.
How long does it take to fly from Austin, TX (AUS-Austin-Bergstrom Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
A nonstop flight from AUS to STL typically takes around 2 hours, covering approximately 721 miles. Connecting flights on this route usually add 3 hours 30 minutes to your travel time. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Austin, TX (AUS-Austin-Bergstrom Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
First class seats are offered on the AUS to STL route. First class cabins are available on:

  • American Airlines
  • United Airlines
  • Delta Air Lines
  • Spirit Airlines

How do I earn miles on a Austin, TX (AUS-Austin-Bergstrom Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight with Expedia?
It's easy to earn miles on a Austin, TX (AUS-Austin-Bergstrom Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for St. Louis from Austin-Bergstrom Intl. (AUS)?
From Austin-Bergstrom Intl. (AUS), you can fly into Lambert-St. Louis Intl. (STL) to reach St. Louis. Some flights may connect through major hubs like George Bush Intercontinental (IAH), Love Field (DAL), William P. Hobby (HOU) before reaching St. Louis. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Austin, TX (AUS-Austin-Bergstrom Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) at the last minute?
Typically, booking a last minute flight from Austin, TX (AUS-Austin-Bergstrom Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Austin, TX (AUS-Austin-Bergstrom Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight and hotel package?
Securing a Austin, TX (AUS-Austin-Bergstrom Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) St Louis Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Austin, TX (AUS-Austin-Bergstrom Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
If you booked your Austin, TX (AUS-Austin-Bergstrom Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Austin-Bergstrom Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$200
Distance
721 mi
Average flight time
2 hours 58 mins

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 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 2026. You can also book with separate airlines for your outbound and return journeys, from $100 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

*Flight schedules are subject to change.

*Available to One Key members.

 

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