I live in Canada, it's winter and it's cold now -- I keep asking myself what am I doing here? And, why am I not in Mexico, or Texas Usa? But, perhaps you want to walk/tumble in snow, skate, ski, etc...

I don't know much about Alberta except that the people I've met from there are friendly. I've heard that Edmonton is probably the best city to visit in Alberta. (I've been to Calgary and parts of it are good, but like many big cities it's a bit too suburban for me.) Off the beaten track and into nature, the prairie is beautiful. Unless I felt compelled to be in a hurry to get there by plane, I would drive, hitchhike, bike, or walk.

Air Transat, and other airlines in Canada are inexpensive, but I think they have a lot of limits imposed on flying from their tourist destinations like Mexico.

I lived in Edmonton for ~8 years, it can be bitter cold in winter and beautiful in the summer. Feel free to contact me with questions (it's been about 4yr since I moved though, I may not be the most up-to-date help :)

How long do you plan to stay? If you don't mind me asking, why Edmonton over more commonly visited cities (Vancouver, Montreal, etc)? What sorts of things/activities are you interested in? And a 4hr bus ride and about $40 will get you from Edmonton to Jasper, if you go I highly recommend you get yourself to the rockies, winter or summer ^_^

Air Canada often has a bunch of last-minute deals from US cities to Canada, I can' t say about Mexico but it may be worth looking directly on their site. Also check Alaska air.