Originally Posted by
Anish
I'd suggest you apply for a transit Indian visa. CCU is not an airport that regularly handles a lot of transit traffic and you wouldn't want to miss your connection due to a slip up.
To the OP .. India now has ETA visa for many countries for tourist visa.. maybe u r citizen of one of these and then process is relatively simple..
https://indianvisaonline.gov.in/visa/tvoa.html