San Francisco Travel now partners with RentalCars.com to provide guests the best deals and alternatives to explore the easy-to-reach destinations past the bridges. The PresidiGo Shuttle system offers free and accessible transportation to and around the Presidio from three routes within the city, seven days a week. Many stops are within a short strolling distance from Muni or Golden Gate Transit bus traces. United Airlines is the leading provider into SFO, with essentially the most domestic and worldwide flights serving the airport annually. United’s home flights are based out of Terminal three, with service within the International Terminal as nicely.