Frontier Airlines San Francisco International Airport passengers check in at Terminal 1, out of San Francisco International Airport (SFO). Terminal 1 is also known as the Harvey Milk Terminal, which has recently offered new, modern facilities for check-in counters, security checkpoints, and self-service kiosks and cozy waiting rooms. While departing passengers are encouraged to check in online or at airport kiosks to make the experience smoother, incoming passengers can access baggage claim and ground transportation without much hassle. With affordable prices and efficient terminal services, Frontier Airlines ensures smooth travel for those flying into San Francisco International Airport, making access to a myriad of domestic locations across the United States relatively effortless.