That can get long and tiring if you aren't flying!
There are direct flights but no direct trains for this journey. Catching a direct flight is the fastest way to do this journey. Chennai (Tamil Nadu) to Port Blair (Andaman And Nicobar Islands) distance is 1363 km and you can get there by flight in just over 2 hours and 5 minutes with fares starting from ₹ 3480.
Beautiful weather for sightseeing and other outdoor activity.