Detroit Michigan to Calgary Alberta Canada?

Try booking straight from the airline's website or as a student you can usually get good deals from travelcuts.com. If you can get to Toronto or Hamilton then look at aircanada.com or westjet.com. Both airlines have cheaper flights that are usually around the same price and depending on when you're going will usually have a seat sale of some sort. Booking this far in advance you should be able to find a flight for around $500. Also, if you can change your dates at all, it's usually cheaper to fly on tues, wed, thurs or sat for some reason.