The journey from Nohwet to Gangtok is a 650 km trip. You will need to reach Shillong and then take a bus to Guwahati, followed by a train or bus to Siliguri, and then a taxi to Gangtok. This route takes you through the heart of Assam and West Bengal into the mountains of Sikkim. Expect a travel time of 20 to 22 hours.
Total Distance: 650 km driving distance, 400 km straight-line air distance.
You will need a permit to enter certain parts of Sikkim.
October to March, when the weather is pleasant.