KLM flight deals to San Francisco start from €343 - this is the best price found recently on momondo, and was a return journey departing from Dublin. Over any normal week, KLM flight prices are typically higher, but vary depending on where you fly from - Atlanta Hartsfield-Jackson is the most popular KLM departure point to San Francisco so generally has the most availability. KLM is scored a 7.8/10 in 1,358 reviews.