The best month to arrive at San Francisco is February and the most expensive month to fly is August. (Average prices, based on 305 datapoints.)
The best day to arrive at San Francisco is Wednesday and it would be best to avoid Friday, as prices are on average 51.4% higher than on Wednesday. (Average prices, based on 412 datapoints.)
The cheapest airline flying to San Francisco is WestJet. They are 95% cheaper than Air India. (Average prices, based on 323 datapoints.)