There are no commercial flights to Antarctica. To reach there, you need to travel by cruise.
First, you will have to transfer from India to Invercargill in New Zealand, Hobart in Australia, or South America.
You can get a cruise from any of these places and travel to Antarctica.
You can also embark on a trip from Ushuaia in Argentina to Antarctica (by ship).
You will have to stay in the expedition ship or you may even get a chance to camp.
As there is a dearth of food options here, provisions for food have to be made in advance.
It will cost you at least around Rs 3.5 lakh, with the price increasing depending on the tour package you choose.