The journey from Mawsynram to Thiruvananthapuram is a massive 3200 km trek across India. Reach Guwahati, then take a long-distance train like the Guwahati-Thiruvananthapuram Express. This is one of the longest train routes in India, taking over 60 hours.
Total Distance: 3200 km by road, 2600 km air distance.
This is a very long journey; book a 2AC or 3AC berth.
October to March for pleasant weather.