Andaman and Nicobar island is a Union Territory of India, in Bay of Bengal comprising of 572 islands of which only 37 are inhabited. Mind you, not all are open for tourists. It is a part of India, thus an Indian citizen doesn't require a passport to travel in our very own country.
Direct flights to Veer Savarkar International Airport are only from Chennai and Kolkata and Vishakapatnam. The prices of these flights depends on your route and season. Typically an On season round trip fare may be around Rs.15K- 20K for one person, whereas the same in an off season may cost you under Rs.10K. If you can grab the Air sale deals and Independence day deals etc., that costs you much lower.
TIP 1 :*Please don't forget to carry Umbrellas, whichever season you go in*
The names of these Islands have been changed in honour Of Netaji Subash Chandra Bose, a Nationalist whose defiant patriotism made him a hero.