Compare the cost of flights to Seattle, you might be able to save some money by taking a domestic flight to Seattle, then taking a bus from Seattle to Whistler. Also, that way, you get on the Greyhound in Seattle, and don't have to worry about anything else, it just takes you to Whistler. Looks like that bus is 50 bucks, so a flight from wherever you are to Seattle is more than 30 bucks cheaper than to Vancouver, you save money.