US airlines require you to call them or go through a ticket agent to book a student fare, if they even offer one. On most US airlines the price is no different then the regular fare or just a few $ different. Airlines outside the US offer better student fares, but again not all are worth it. If you’re in Europe just try EasyJet, they normally offer rock bottom fares, of course with no add-ons. (nuts,drinks,etc all cost you)