Cheap Delta flights Atlanta (ATL) to St. Louis (STL)

Use the "Price (lowest to highest)" filter on Expedia to look for cheap Delta Air Lines round-trip flights from ATL to STL. Affordable one-way fares are also available.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

For cheap Delta Air Lines fares from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Lambert-St. Louis Intl. Airport (STL), start searching one to three months before your intended departure. Reserving domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also impact the cost. Sunday is generally the cheapest, while Monday is often the most expensive for domestic flights. You can save 6% on average by choosing to book on a Sunday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.

Jetting off from ATL at 8:35AM UTC-5, the first Delta Air Lines flight to STL arrives at 9:21AM UTC-6. Traveling earlier in the day means you're less likely to encounter delays or cancellations.* Prefer to travel later? The last Delta Air Lines flight from ATL to STL departs at 10:54PM UTC-5 and touches down at 11:36PM UTC-6.*Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.

Offering an excellent in-flight experience and a rewarding loyalty program, Delta Air Lines is a top choice for many passengers heading from ATL to STL. Also, if you're a Delta SkyMiles and One Key™ member booking through Expedia, you could earn OneKeyCash™* on eligible flights on top of your airline miles, which can be spent on future trips.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.