How much time should I allow before my SFO flight departs?
Most airlines suggest that you arrive to SFO about two hours before your plane is scheduled to depart. If you are flying on an international flight, SFO recommends that you arrive at the airport three hours before departure, as a general guideline. For the most accurate information regarding flight status, and arrival and departure times, SFO suggests travelers should contact the specific airplane for appropriate arrival times. Otherwise, you could find yourself exploring endless bookshops and magazine stands while waiting for your flight.