For travel over the week of Thanksgiving, fly nonstop from Seattle to Reykjavik for $631 round-trip, including all taxes, on Icelandair.
We found seats departing SEA on Sunday, November 23, returning from KEF on the following Sunday, November 30.
Other dates are available for travel through early December. You'll find fares to be a smidgen lower ($623) for travel from January through late March.
Visit our Reykjavik KEF fare page for a complete listing of current deals from all over the US and Canada.