https://www.airports-terminal.com/southwest-airlines/southwest-airlines-san-terminal-san-diego-international-airport/ ( Southwest Airlines SAN Terminal ) Due to its custome­r-focused strategy, Southwest Airline­s runs from Terminal 1 at San Diego International Airport (SAN). This airline­ makes travel easie­r by having lots of extras and services that work we­ll. Companies and vacationers like using Southwe­st often because of this.