By Air
The nearest airport to Lachen is the Bagdogra Airport in West Bengal which is around 200 kilometers from Lachen. From the airport, you can take a taxi and reach Gangtok first. You need Inner Line Permit (ILP) to visit Lachen which you can obtain through your travel agent. The most convenient and the only way to reach Lachen is to first come to Gangtok and then from there drive down to Lachen.