Where in Alberta are you? Great Falls, MT has an international airport so it would likely have some ok deals. How many of you will be going? DH & I have driven from Winnipeg to Minneapolis to save $350/person, but that's a 7 - 8 hour drive and I'm not sure I'd do it again. We really didn't end up a lot of $$ ahead after we added up all the bills, but we treated it as a pre-holiday before our holiday. Gas there, a hotel overnight, park n fly fees, another hotel overnight, and gas home ended up costing us around $600. If we could get a fare that would save us more than $100, I'd consider it again.
Now if I were going with a family of 4 or 5 and it would save $350/person, I would hop all over the idea of another 8 hour drive to the states to catch a plane.