The journey from Kadapakkam to Dehradun covers 2500 km. You need to reach Chennai to catch trains to Dehradun Junction. The road route is very long. Train travel takes approximately 45 to 50 hours. Dehradun is the capital of Uttarakhand and a gateway to the Himalayas.
Total Distance: 2500 km by road, 2100 km air distance.
Check for train schedules on the IRCTC portal.
March to June and September to November.