if you are in nus, go to science co-opthere is STA travel agency, i think the price they offer will not differ very much from the majority. i booked my tickets there for the past few years. Very convenient and easy. STA is a well-known travel agency for its europe package for students. if you wanna to check out the airfare, can go to www.airticket.com.sg quite comprehensive website for the rates.

Thanks! Another question...How long after booking can I get the ticket?