Druk Air (KB) (website: www.drukair.com.bt), the national airline of Bhutan, is the only airline serving Bhutan. It is compulsory for all visitors to Bhutan to travel at least one-way by Druk Air. Druk Air operates flights from Kolkata (Calcutta), Gaya and New Delhi (India), Dhaka (Bangladesh), Kathmandu (Nepal) and Bangkok (Thailand). The Kathmandu-Paro flight has fabulous views of the Himalaya on the left-hand side.
Druk Air will only issue tickets after visa clearance (arranged by Tour Operator).