At Seattle-Tacoma International Airport (SEA), Southwest Airlines SEA Terminal is based out of Concourse B. Check-in desks, self-service kiosks, and security screening are all conveniently situated close to the entrance, making this terminal fully furnished with all the amenities that travelers need. Concourse B provides a variety of dining options, shops, and coffee shops for Southwest passengers, making it simple to locate last-minute travel necessities and refreshments prior to boarding.