Until the early 1960s, people could only reach the kingdom of Bhutan by foot from two main entry points. The northern route was from Tibet. People needed to cross high mountain passes to get to Bhutan. Another route was to pass the plains of Assam and West Bengal. Both routes were difficult and dangerous, which was the reason why Bhutan remained largely isolated at that time.
The road from Phuntsholing on the southwestern border to Thimphu and Paro began to be built in 1962. After that, Bhutan was accessible via vehicles. It will take about 6 hours to cover the 170km between Phuntsholing and Thimphu.
Another entry point is located in south-central Bhutan named Gelephu. The road between Gelephu and Thimphu stretches about 250km, which will take 10 hours. You will be able to get into the sub-tropical areas of Bhutan and across three districts before arriving in the capital city.
The longest route to get to Thimphu is from Samdrup Jongkhar which borders the Indian district of Darranga, Assam. It covers about 700 km and will take tourists at least 3 days.
The only international airport in Bhutan is situated in the valley of Paro. And there are domestic airports in Yonphula, Bumthang, and Gelephu. All airlines are operated by two carriers in Bhutan - Druk Air and Bhutan Airlines. As a government-owned airline, Druk Air runs flights between Bangkok, Delhi, Kolkata, Kathmandu, Dhaka, and Singapore. And Bhutan Airlines connect Bhutan with Bangkok, Kolkata, Delhi, and Kathmandu. Flight schedule is subject to change and you can check it on the official sites of both airlines.
Flight to Bhutan