Serving both domestic and international flights, Frontier Airlines SAN Terminal is based out of San Diego International Airport (SAN), a busy airport in Southern California. Cost-conscious travelers are catered to by Frontier's low-cost model, which offers affordable fares and a streamlined service structure. From Terminal 1, a vital airport hub that sees a lot of airlines and travelers each day, Frontier operates out of SAN. An extensive overview of the facilities, services, and operations of Frontier Airlines at SAN's Terminal 1.