Usually the cost depends on the number of days of the trip plus inclusions you choose for your trip. For 4 days and 3 Nights trip it may cost around Rs 17,000 per person without flight. For 5 Days and 4 Nights trip to Shillong, it can cost near Rs 25,000 per person inclusive of flights, accommodation, sightseeing and transfers. And for 7 Days 6Nights it may cost near Rs 35,000 with inclusions.