The journey from Thunag to Chennai is one of the longest in India, spanning over 2700 km. You will need to travel by road to Chandigarh and then board a long-distance train like the Andaman Express or similar. This journey takes you from the mountains to the southern coast of India.
Total Distance: 2750 km driving distance, 2200 km air distance.
Ensure you have a confirmed ticket as this is a very long route.
November to February for pleasant weather in Chennai.