Cheap flights from Austin to St. Louis from $99

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 $268. The month of May is another great option to travel to St. Louis, with average flight prices from Austin averaging around $299.

The cheapest day to depart on your flight to St. Louis is on a Friday when prices can be found for as low as $342. 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 $489. 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 at noon is the least expensive time of day to depart. momondo users have found prices as low as $358 when looking at flights departing at noon. In the afternoon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $378 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 $333 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 to 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 29% on your flight if you consider stops on a Austin to St. Louis flight.

As of June 2026, prices for Austin to St. Louis flights are approximately 15% more expensive when compared to flights at the same time last year.

Southwest, Delta, and United Airlines 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 74% 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.

As of June 2026, there are 2 flights per day flying from Austin to St. Louis. The most common time of day flights depart is 7:00AM, with 50% of flights taking off at noon.

As of June 2026, 18 flights take off from Austin and land in St. Louis each week. The most common flight departure day for this route is Mon, with 22% of weekly flights taking off on this day.