You can go easily port Blair with tripoto plan.. best plan if you use your 500 credit.. plan cost is 14000 but for you after credit only 5600/- for 4 night 5days.. only fight is excluding.. but have to pay for your partner 14000/- here is link.. https://www.tripoto.com/travel-for-free-contest
Https://www.tripoto.com/tour-packages and search for destination as andaman and nicobar Also, you can redeem the package using credits and paying the discounted price offered by Tripoto.