By air: You get direct international flights to Bhutan from Bangkok, Delhi, Kolkata, Bagdogra, Bodh Gaya, Dhaka, Kathmandu, Guwahati, Singapore, and Mumbai. The flight between Paro and Kathmandu is one of the most exciting and popular. If you are traveling that way, you get to admire incredible views of four of the five highest mountains on earth.
By land: Phuentsholing, Gelephu, and Samdrup Jongkhar are the only land border areas open to tourists. The town of Phuentsholing in south-west Bhutan is located approximately 170 km east of the Indian national airport at Bagdogra. After crossing Phuentsholing, it takes you about 6 hours to reach Thimphu. Most tourists wishing to travel to Thimphu via Nepal by land choose the Phuentsholing route.