hi, the air fares are highest during peak seasons - mid december to end of january. July - end of august.
its cheaper to come by boat which is a 3000rs - 4000rs less than by air. you can enquire the exact rates on
check for visa conditions before coming as you need an accomodation certificate for the length of your stay and proof of sufficient financial autonomy ( at least 50€ per day).
as for the rest good luck and bon voyage!