Bihar to Sikkim · 440 km · Compare trains, buses & driving options
The straight-line distance from Siwan to Gangtok is approximately 440 km (273 miles). By road, the distance increases to about 623 km due to terrain, highways, and road networks connecting Bihar to Sikkim.
Gangtok does not have its own commercial airport. The nearest airport is IXB. Fly to the nearest airport and continue by road or rail.
Search Flights to Nearest AirportIndian Railways connects Siwan and Gangtok with multiple daily services. The journey takes approximately 9 hrs 35 min. Rajdhani and Shatabdi express trains are faster, while mail and passenger trains make more stops but cost less.
Book in advance through IRCTC, especially during festivals and holidays when seats fill up quickly.
Check Trains on IRCTCBus travel is a popular and affordable option for the Siwan to Gangtok route. The journey takes approximately 12 hrs 28 min covering ~623 km. Both government and private operators service this route.
Night buses are popular for this distance — travel while you sleep and arrive fresh at your destination.
Search Siwan to Gangtok BusesA road trip from Siwan to Gangtok covers approximately 623 km and takes around 7 hrs 38 min. Start early to make the most of daylight hours.
For official travel information, regulations, and booking services:
IRCTC — Indian Railway Catering and Tourism Corporation — Book train tickets online
Airports Authority of India — Airport information and flight status
DGCA — Directorate General of Civil Aviation — Indian aviation regulator
Incredible India — Official tourism portal of India