Bhutan’s National Air Carrier, Druk Air, operates flight from Delhi, Kolkata (twice a week), Kathmandu (twice a week), Bangkok (thrice a week), Dhaka (once a week). For detailed information about airline, schedule and tariff, please refer to its website : www.drukair.com.bt
Entry / Exit to Bhutan is also possible through Phuentsholing, the southern Bhutan frontier town. Bagdogra airport, in the state of West Bengal (India) is the nearest airport about 5 hours drive from Phuentsholing. Also Bagdogra (and its main town Siliguri) is the convenient point for visiting West Bengal region of Darjeeling, Kalimpong, state of Sikkim.
Badrapur (about 5 hours drive from Phuentsholing) and Birat Nagar (about 7 hours drive from Phuentsholing) are two other airports in Nepal, connected with regular flights from Kathmandu.