I looked at flight costs from East Canada (Halifax) to Kelowna a week or two back on speculation. Flights to Lima Peru were cheaper. I can get to Denver, SLC, LA cheaper than I can get to Kelowna (1100 taxes in, kid you not). I'd love to ski B.C. and will someday but gonna have to do a bit more pre-planning with the piggy bank for next year.
Similar experience here. We were looking at a ski vacation to Calgary or Kelowna (Toronto departure), and it was crazy. We ended up booking to Denver (Buffalo departure) and it was $1000 cheaper MINIMUM just for flights for a family of 4. Factor in other savings from Intrawest on lift tickets, and we are saving MAJOR money by going to Colorado instead of B.C or Alberta.
Sadly, it's cheaper for us to vacation in the US than in Canada for skiing. I would love to hit the incomparible Canadian Rockies, but I guess the American Rockies will have to suffice LOL.