Fares on the Seattle to San Francisco route vary noticeably by season and demand. Right now the lowest available price is €110 with Kiwi.com. Non-stop flights are available, making it a convenient option if you want to skip layovers. Booking further in advance typically unlocks lower prices, especially around school holidays and peak travel months. The calendar below maps out the cheapest and most expensive months so you can plan before committing to dates.
Prices to San Francisco are typically lowest in the shoulder months shown in the calendar above. Searching for mid-week flights and avoiding school holiday windows can meaningfully cut costs on this route. If you're open on destination, use the interactive map from Seattle to compare San Francisco against nearby alternatives - you may find a cheaper fare to a similar destination.
San Francisco is one of America's most distinctive cities - the Golden Gate Bridge, cable cars, Victorian painted ladies, and a food culture shaped by its Asian communities and Silicon Valley wealth. San Francisco International Airport (SFO) has direct connections from several European cities; Napa Valley is 90 minutes north and Yosemite is a 3-hour drive east.