Spirit Airlines SAN Terminal, which operates out of Terminal 1 at San Diego International Airport (SAN), offers travelers an inexpensive travel option to a number of local and international destinations. The airline allows online check-in up to 24 hours before departure so that passengers can bypass the airport lines. Travelers checking in at the airport can use the Spirit Airlines check-in counters located in Terminal 1. Travelers should understand the rules beforehand because Spirit Airlines, which is known for its affordable flights, charges extra for things like checked bags, seat selection, and onboard refreshments. With the variety of restaurants and shops in Terminal 1, you can be sure that you will have a comfortable wait before your flight. Spirit Airlines at SAN promises every traveler a speedy and inexpensive journey.