To find the return flight distance between Gangtok - Rangpo Rd to Siliguri via Lachen, Lachen, Lachung, Gangtok, start with entering the locations in the control and click on Return Flight Distance. You can also add multiple destinations in between while returning from a location. If you are not aware of the routes, you can check the
Gangtok - Rangpo Rd to Lachen Route via Lachen, Lachen, Lachung, Gangtok.