Cheap flights from Atlanta to St. Louis from $18

In general, September is the cheapest month to fly from Atlanta to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $148. The month of June is another great option to travel to St. Louis, with average flight prices from Atlanta averaging around $165.

The cheapest day to depart on your flight to St. Louis is on a Saturday when prices can be found for as low as $228. 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 Monday because tickets tend to average around $333. 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 Atlanta in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $256 when looking at flights departing in the afternoon. In the evening is when there is more demand to fly to St. Louis, so prices are often more expensive at around $335 per ticket.

Fly from Atlanta Hartsfield-Jackson to Lambert-St Louis for the best Atlanta Hartsfield-Jackson - Lambert-St Louis flight prices

You are more likely to see cheaper flights to St. Louis from Atlanta when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $204 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Atlanta for as low as $139 on momondo.

There are 4 cabin classes available to choose from on Atlanta to St. Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Delta is the most popular carrier operating from Atlanta Hartsfield-Jackson to Lambert-St Louis

Frontier, Delta and Southwest are the top three most popular airlines that fly to St. Louis from Atlanta according to our data. Frontier is the first choice among our users, with 43% 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.

The number of flights available between Atlanta and St. Louis is 22 per day as of September 2026. The most frequent departure time is 11:00PM, with 60% of daily flights leaving in the evening.

The number of flights available between Atlanta and St. Louis is 156 per week as of September 2026. The most frequent departure day is Sun, with 22% of weekly flights leaving on this day.