Cheap flights from St. Louis to Austin from $77

The cheapest month to fly to Austin from St. Louis is in September. Flight prices, which tend to average around $231, are often lower during this time because this is during the off-season. If you’re not able to fly to Austin in September, then August is your next best option. Flight prices from St. Louis to Austin during August average around $254.

The cheapest day to depart on your flight to Austin is on a Tuesday when prices can be found for as low as $303. This is often the case because there is less demand to fly during this day of the week. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from St. Louis to Austin for around $464.

In the evening is the cheapest time of day to fly from St. Louis to Austin when you can find flight prices for as low as $273. Flying to Austin in the evening is an ideal time because this is during off-peak travel hours. Flights to Austin are more costly in the afternoon, with an average ticket price of $359. Departure times in the afternoon fall within the peak daily travel times, which is why tickets can be more expensive.

Fly from Lambert-St Louis to Austin Bergstrom for the best Lambert-St Louis - Austin Bergstrom flight prices

You are more likely to see cheaper flights to Austin from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Austin for around $312 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Austin from St. Louis for as low as $206 on momondo.

There is only 1 cabin class available to choose from on Lambert-St Louis to Austin Bergstrom flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

No. A direct flight is the cheapest option for a flight between St. Louis to Austin.

As of February 2026, prices for St. Louis to Austin flights are approximately 118% more expensive when compared to flights at the same time last year.

Frontier and Southwest are the most popular carriers operating from Lambert-St Louis to Austin Bergstrom

Southwest, American Airlines and United Airlines are the top three most popular airlines that fly to Austin from St. Louis according to our data. Southwest is the first choice among our users, with 67% of people opting to fly with this airline when traveling to Austin. Keep in mind that there are 5 different airlines that fly to Austin on a routine basis, so you have a few additional options to choose from.

Dallas (DFW) was the most common stop: 75% of momondo users choosing 1-stop flights on this route connected there.

Flights via Atlanta (ATL) offer the lowest average round-trip price of $196.

Flights connecting via Dallas (DFW) have the shortest average one-way travel time: 4h 21m.

Dallas (DFW) has the shortest average layover time for this route: 0h 59m.

1 flights are operational daily from St. Louis to Austin as of February 2026. The most popular departure time for this route is 9:00AM, with 50% of flights per day taking off at noon.

As of February 2026, there are 8 flights per week flying from St. Louis to Austin. The most common day of the week flights depart is Mon, with 25% of flights taking off on this day.