It looks like it will cost you about $50 more to fly, but you'll spend less time travelling. The Rockies would look fantastic by train, but I'm not sure if you have enough time in your schedule for it.
Since airfarces change practically daily, your best bet is to go to:
www.westjet.ca.
If you need a currency converter, I use
www.xe.com. It looks like $1 CDN = $0.86 USD right now.