Helicopter Service: The Bagdogra airport is connected to Gangtok by a helicopter service which takes approx. 30 minutes to reach Gangtok.

Sikkim Tourism Development Corporation  operates this service daily at 11:00 AM from  Gangtok to Bagdogra and at 2:00 PM from Bagdogra to Gangtok It is a five seater chopper and mountain flights and other such tours to North Sikkim are conducted.

By Rail : The closest Railhead is at New Jalpaiguri which is around 148 km away from Gangtok. It is connected to Kolkata(Calcutta), New Delhi, Guwahati and other major Indian cities.
Click here for the Train Timings

By Road : Gangtok is at a distance of 110 km from Siliguri and will take 4 hours from Siliguri to reach Gangtok .

Foreigners Entry Formalities:
Visa & Permits : In addition to an Indian visa, foreigners must obtain Inner Line Permit (ILP) to visit Sikkim. The permits can be obtained from all Indian missions, Tourism Office, New Delhi, Sikkim Tourism Office, Calcutta and Sikkim Tourism Office, Siliguri on the strength of an Indian Visa.

Foreigners are issued  a permit for initial period of 15 days duration on the spot without any delay provided photocopies of Passport and Visa details along with two passport photos of applicants are made available then and there. It can be extended for further 30 days of 15 days each. The extension of permits can be obtained from  Foreigners Registration Office(FRO), Gangtok and Superintendent of Police of North, South and West Districts.