What Terminal is Spirit Airlines at BWI? Spirit Airlines operates from Concourse D at Baltimore/Washington International Thurgood Marshall Airport (BWI). This terminal is known for its efficient services and amenities designed to enhance the passenger experience. Concourse D offers dining options, retail outlets, and comfortable seating areas for travelers. Spirit Airlines provides both domestic and international flights from this terminal, catering to budget-conscious passengers. Travelers are encouraged to check the airline’s website for updates on flight schedules and terminal information.