Paro Valley, Bhutan Tour Packages, India TourismAll visitors are now required to enter the kingdom at paro by the national airline, Druk-Air.It may be more convenient for some visitors to leave the kingdom via the southern outlets of Samdrup Jangkhar in the east or phuentsholing in the west. Twenty-five years ago all visitors would have had to walk for five days across the mountains to each paro from the Indian border. Now the journey by air is only 45 minutes from Calcutta, kathmandu or Dhaka. The mythical dream-like kingdom comes into view as Druk-Air’s BAE-146 aircraft swings in giant arcs and descends onto Bhutan’s only airstrip at paro. Once on the ground the dexterity of the international flight crew can be fully appreciated as a glance in any direction provides an aweinspiring view at very close range of the Himalayan mountains.