United Airlines is one of the major airlines with a huge hub at United Airlines San Francisco International Airport (SFO). The airline provides both domestic and international flights. As one of United's largest hubs, SFO provides connections to key destinations in Asia, Europe, and across the U.S. The airline operates from Terminal 3 and the International Terminal, featuring Polaris lounges for premium travelers. United ensures a seamless travel experience with advanced facilities, efficient check-in services, and frequent flights. The location of SFO makes it an important gateway for transpacific routes, and United's presence on the West Coast is strong.