Bhutan is accessible by road. If you reach North East India, it is easy to come to Bhutan by road through the Bhutanese border town of Phuentsholing. You can fly till Bagdora airport West Bengal, India, from where it is only three hours drive to the border town. The Indian hill stations of Darjeeling, West Bengal and Gangtok, Sikkim are only 5 hours away by road from Phuentsholing.
You can exit the country via the Phuentsholing also. We would be glad to reach you till the airport at Bagdora or railway station of NJP in Siliguri, both in West Bengal at no extra charge.