I don't think I can browse any more at this time. Please give it another go later. On the other hand, general information indicates that  Southwest Airlines SEA Terminal is based out of Seattle-Tacoma International Airport's Concourse C (SEA). Southwest operates both domestic and some international flights out of this terminal. Gate assignments are subject to change, so be sure to check your flight details for any adjustments. It's better to check directly with the airline or the airport for the most up-to-date information. If you require further information, please let me know!