Icelandair has $397 round trip tickets for winter travel from Seattle to Helsinki, Finland with flights from January through March. Free checked and carry-on bags and the option to stopover in Iceland for a few dollars more makes this fare a great deal for the right flyer. Star Alliance flights are priced in mid $400s for this route.
Alaska Airlines partners with Icelandair for connecting flights to Seattle. There are published fares to Helsinki with Icelandair from Sacramento, San Jose, San Francisco and Los Angeles priced from $516 to $546 round trip.
Icelandair Economy Booking Code N earns 50% flight miles with Finnair, a Oneworld Alliance member airline.
Icelandair Seattle – Reykjavik KEF – Helsinki, Finland – KEF – SEA
Icelandair San Jose SJC – Seattle – Reykjavik KEF – Helsinki, Finland – KEF – SEA – SJC