I'll bet it would cost a *lot* less that $672 round trip from Seattle or Denver.I can't imagine it being *too* expensive getting from Idaho to either of those cities.
I just looked it up at Google Flights. Denver to London, Jan. 20th to Jan. 29th. $352 round trip on Icelandair.
There's a 25 hour layover in Reykjavik on the way back though, so you have to spend a day in Iceland. Ah, first world problems....
Expensive, no, but Denver’s 1100 miles away. Seattle’s only 320, so there’s that... Let’s face it, this is the boondox around heah... ;-)