If you fly to Bhutan, you must use the national airline, Druk Air. The only airport in Bhutan is located at Paro. Druk Air flies to Paro airport from Bangkok (Thailand), Kathmandu (Nepal), New Delhi and Kolkata (India), Dhaka (Bangladesh) and Yangoon (Myanmar). Expect to pay around $360 one way for a flight from Delhi to Paro, and $240 from Kolkata to Paro.It's also possible to travel to Bhutan from India overland by road. The main border crossing is Jaigon-Phuentsholing.