Frontier Airlines primarily operates from the South Terminal at Hartsfield-Jackson Atlanta International Airport (ATL), but certain international flights may require passengers to use the International Terminal (Terminal F). This terminal is equipped with customs and immigration facilities to manage international departures and arrivals. Passengers flying internationally with Frontier should check their boarding pass for the correct terminal and gate information. The International Terminal offers amenities such as dining options, shops, and lounges. Arrive at least three hours before your flight to ensure enough time for check-in, security, and customs procedures.