Dehradun, the gateway to the Himalayas, is a long journey from Vellore. The most practical way is to fly from Chennai to Jolly Grant Airport in Dehradun. Alternatively, you can take a long-distance train from Katpadi to Delhi and then a connecting train or bus to Dehradun. This route takes you from the tropical south to the foothills of the Himalayas.
Total Distance: 2400 km by road, 2000 km air distance.
The train journey is long; consider breaking it in Delhi.
Book flights with a short layover in Delhi or Mumbai.
March to June and September to November.