The fares and deals vary between travel agents. Some are focusing on student travelers and some on regular travelers. One way discount fare is available to only student under 32(the age limit is depend on airlines.)or youth under 26. Some airlines offer special deal to anybody so shop around and ask around. The fare list below is not from Vista. But Vista's web site is still useful to know.
ta	Vista Travel: http://www.vista.hu

The fare are R/T, non student fare. Some restriction may be applied
AMSTELDAM	52,000	NEW YORK	90,000
PARIS	40,000	LA	119,000
LONDON	48,000	TOKYO	160,000
ZURICH	44,000	SYDNEY	210,900
FRANKFURT	45,500	CAIRO	95,300
COPENHAGEN	58,000	ISTAMBUL	45,000
HELSINKI	29,000
ATHEN	45,500