I am travelling from the USA to Delhi and 90 minutes later I need to catch another flight from Delhi to Chandigarh
What is the best way to reach to domestic airport so that I catch my flight in 90 minutes?
Delhi has 2 airports. Terminal 2 (T3)is where all International flights land. Your domestic flight may leave from T3, or the domestic terminal 1D.
If its different airports, there no way you can make the transfer.
If its the same airport, its possible if your luggage is booked thru to the nextt destination and you have your boarding pass. Otherwise its difficult to make the transfer as the check in counter for the domestic flight will close 45 minutes before departure (giving you a max of 45 minutes, assuming your flight is on time, to deplane, clear immigration, get your luggage, clear customs, go to the domestic counter, check in and pass security.
Delhi does have an International and Domestic airport in the same area. There are internal passage from the International Terminal to the Domestic Terminal. The airport authorities would help to transfer the luggage from one terminal to another.
Regarding 90 minutes, you can manage it within 15 minutes, along with the transfer of the luggage.
As you land to Delhi International airport T2, you can proceed to T3 terminal.