In general, when booking your flight to San Francisco, May is the cheapest month on average.
In general, most flyers find the cheapest time to book a flight to San Francisco is about 32 days prior.
Most of our users find that booking their departure to San Francisco on a Monday is the cheapest. Conversely, departing on a Friday seems to be the most expensive.
In general, when looking for the cheapest flight to San Francisco, our data indicates that evening flights are the most cost-effective. morning flights tend to be the most expensive.