Cheap flights from Austin to St. Louis from $66

In general, October is the cheapest month to fly from Austin to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $271. The month of April is another great option to travel to St. Louis, with average flight prices from Austin averaging around $303.

The cheapest day to depart on your flight to St. Louis is on a Tuesday when prices can be found for as low as $308. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $468. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

Flying to St. Louis from Austin in the morning is the least expensive time of day to depart. momondo users have found prices as low as $329 when looking at flights departing in the morning. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $373 per ticket.

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

You are more likely to see cheaper flights to St. Louis from Austin when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $328 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Austin for as low as $223 on momondo.

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

You could potentially save up to 27% on your flight if you consider stops on a Austin to St. Louis flight.

As of February 2026, prices for Austin to St. Louis flights are approximately 52% more expensive when compared to flights at the same time last year.

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

Southwest, American Airlines and United Airlines are the top three most popular airlines that fly to St. Louis from Austin according to our data. Southwest is the first choice among our users, with 69% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 5 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

Dallas (DFW) was the most common stop: 50% of momondo users choosing 1-stop flights on this route connected there.

Flights via Dallas (DFW) offer the lowest average round-trip price of $260.

Flights connecting via Houston (HOU) have the shortest average one-way travel time: 3h 40m.

Houston (HOU) has the shortest average layover time for this route: 0h 40m.

As of February 2026, there are 2 flights per day flying from Austin to St. Louis. The most common time of day flights depart is 5:00AM, with 40% of flights taking off in the morning.

As of February 2026, 15 flights take off from Austin and land in St. Louis each week. The most common flight departure day for this route is Mon, with 33% of weekly flights taking off on this day.