Note:

* Ticket consolidators (also called "bucket shops") can offer international air fares at dramatically discounted rates, often 50% less than what you will find through a "standard" travel agency. You can check for discounted fares at http://www.airlineconsolidator.com/
Some other good websites to try are: www.orbitz.com, www.travelocity.com and www.priceline.com
Prices will be different depending on how far in advance you buy your tickets. Cheapest rates are for Monday through Thursday flights; flights Friday through Sunday are more expensive.

* Special student fares are available and can be found through the International House, STA and, perhaps, through GLOBI, the Global Business Institute.

** No visa cost for US citizens, but international students need to check with the Argentina Consulate.