Summer of 2014 we went to see my brother who lives in Whitehorse, Yukon. If you are flying there from Europe, this is your best bet. They fly non-stop from Frankfurt over the ice cap. It's really cool. Great flight. Lovely service and good meal along the way.
We flew there in premium economy and decided to come back in business class since it was a long flight and we wanted to sleep. Lovely vacation.
I never have the opportunity to fly Lufthansa much, but when it pops up on expedia, I always look at it. I had a nice experience with them.