United Airlines has Denver or Chicago to Reykjavik, Iceland KEF priced in mid-$300s from Chicago and Denver. Departure dates are May to mid-June, then again from mid-August. There are tickets in the mid-$400s for July travel.
Momondo.com has lower ticket prices by as much as $50 for some dates, while other dates were only a $5 difference from the price on united.com.
Chicago ORD – Montreal YUL – Reykjavik KEF – Montreal YUL – Chicago ORD
$366.01 round trip Sun Sep 2 – Sat Sep 8
$361 round trip Momondo.com – TravelMerry.com search.
United Airlines Denver DEN – Newark EWR – Reykjavik KEF – Newark EWR – Denver DEN
$397.51 round trip Thu Sep 6 – Wed Sep 12
United Airlines Denver DEN – Newark EWR – Reykjavik KEF – Newark EWR – Denver DEN
$408.61 round trip Thu Sep 6 – Wed Sep 12
Momondo.com – TravelMerry.com $354 round trip
This is quite a discount on an already low ticket price through TravelMerry.com.
