The Druk Air (Bhutan's national carrier) flight, is the only way to fly into Bhutan from Kolkata, Bagdogra, New Delhi, Gaya, Guwahati and Mumbai. The flight rates quoted on the site are way too expensive for such short distances. Find a local travel agent and you'll get it for half the price. Another, much cheaper, option via road into Bhutan was through Phuentsholing in Bhutan, either via bus from Kolkata (18 hours) or from the Hasimara Railway Station (1hr). But since I was informed about the spectacular view of the Himalayas and the location of Paro's airport between the mountains, I decided to take the aerial route landing into one of the most difficult airports to fly into. With the plane zig-zagging through the peaks like a fighter craft, the flight itself was an experience. Another option available to fly in private owned airline called Tashi Airline or Bhutan airways.