What Terminal is Southwest Airlines at ATL? Concourse C at Hartsfield-Jackson Atlanta International Airport (ATL) is where Southwest Airlines is based. With its cutting-edge amenities and effective services, ATL, the busiest airport in the world, guarantees seamless connectivity for Southwest travelers. Travelers can use a range of facilities in Concourse C, such as dining establishments, retail stores, and cozy seating places. Southwest Airlines is a convenient hub for travelers visiting locations throughout the United States because it offers a large number of domestic flights from Atlanta. ATL’s automated rail system makes it simple for passengers to move about the terminal, guaranteeing a smooth journey. Visit the official websites of Southwest Airlines or ATL for the most recent flight schedule and terminal services.