What are good websites or places to get cheap Flights for Students?

This is my first time traveling abroad and I am suprised some of the flights are more expensive than the classes. I am traveling to Salamanca Spain from Texas.What are good websites or places to get cheap Flights for Students?
Good advice in the first answer. In addition to http://www.studentuniverse.com and Kayak, also try http://www.travelcuts.com and http://www.statravel.com and http://www.generationfly.com for student tickets. Shop on price also with http://www.bookingbuddy.com which checks Kayak, Orbitz, Priceline, Hotwire, Cheaptickets, CheapO, airlines direct, more air consolidators, sites that check other sites, etc. etc. all with just 1 input of cities and dates.
I think studentuniverse.com is the big one, but you should still try regular online flight sites like kayak.



But from what I've heard, you might save more on international flights by going through a travel agent.What are good websites or places to get cheap Flights for Students?
http://www.orbitz.com

http://www.flightnetwork.com

http://www.cheapflights.com