On Air France, fly from San Francisco to Helsinki for $510 round-trip.
Searching Air France, we found seats departing SFO on May 16, returning from HEL on May 23. Flights connect via Paris (CDG).
Other dates are also available for travel from January through June.
See our fare details for booking info.
Need a room in Helsinki? Here's what's available for the above dates on Hotelwatchdog.