United and Star Alliance have amazingly low fares from $349 to $415 round trip today from San Francisco to Stockholm, Sweden for travel April-May, August-October.
United Airlines website prices tickets around $400 to $415, while Momondo.com searches pull up fares as low as $349 round trip.
Google Flights shows $390 to $399 fares for United, however, my searches generally found prices to be about $17 higher on united.com.
Update: Oslo, Norway OSL and Gothenburg, Sweden GOT are also on sale from Bay Area airports. This is a real fare war with Oneworld low fares around $400 are available from San Jose SJC and SkyTeam fares, some under $400 from SFO and SJC.
Loyalty Traveler – Fare War Skyteam $382 SFO to Stockholm summer fare (March 16).
United Airlines San Francisco SFO – Munich MUC – Stockholm ARN – Frankfurt FRA – San Francisco SFO
Momondo.com metasearch – FareDepot.com ota ticket
San Francisco SFO – Munich MUC – Stockholm ARN – Zurich ZRH – San Francisco SFO
(Sort of like Priceline in that it does not show airline flight numbers, but these are Star Alliance flights).
$348.97 round trip Wed Aug 23 – Wed Aug 30