I would go with 90 minutes minimum. The last time I flew through ATL, 50 minutes was enough time to leave my flight, change terminals, and stand in line to board the next flight. All domestic. As someone who flies through Atlanta ALL THE TIME -- you can make it if everything is on time.

Hartsfield-Jackson Atlanta International Airport (ATL) is the world’s busiest airport, but it is remarkably efficient and generally considered easy to navigate due to its logical layout. The airport consists of seven parallel concourses (T, A, B, C, D, E, and F) connected by the Plane Train, an automated underground people mover that runs every two minutes. If your bags are checked through, you simply follow signs to the next concourse and hop on the train, which takes only minutes. For domestic-to-domestic connections, a 60-to-80-minute layover is usually sufficient. However, if you are arriving on an international flight, you must clear immigration and customs, reclaim your bags, and re-clear security, which can take significantly longer—potentially two hours or more. In 2026, while the high-fidelity signage and constant train service make the physical transit simple, the sheer volume of passengers means you should account for potential "High-Fidelity" delays at security or gate changes, especially during peak travel holidays or severe Georgia weather.