The journey from Kulamavu to Dehradun covers about 3000 km. The most practical way is to take a bus to Ernakulam and then a train to Dehradun. The train journey takes about 50 to 55 hours. This is a very long journey, so plan accordingly.
Total Distance: Driving distance is 3000 km; straight-line air distance is 2400 km.
Book your train tickets well in advance.
October to March is the best time to visit Dehradun.