What Terminal is Southwest at ATL? If you're flying Southwest Airlines at Hartsfield-Jackson Atlanta International Airport (ATL), you'll be using Terminal North (Domestic Terminal North). Southwest operates out of Concourse C, so once you check in at the North Terminal, head through security and make your way to Concourse C for your departure. ATL is a massive airport, but with the efficient Plane Train system, getting around is pretty straightforward. Be sure to arrive early to navigate security and grab a snack before your flight.
