Fly from Denver to Reykjavik for $604 round-trip, nonstop, including all taxes, on Icelandair. We found the fare below for travel in mid/late May. Pretty good stuff when you consider the next lowest fare listed on Travelocity for these same dates is $1,385 round-trip with taxes, and that comes with an out-of-the-way connection in London. No thanks!
Tickets require a Saturday night stay. Available only for travel in May. For booking info, see our fare details.