Air India has round-trip flights from Chicago (ORD) to New Delhi, Hyderabad, or Bengaluru (DEL, HYD, BLR) for $676. New Delhi fares are NONSTOP, others have a connection. Flights in October, January, February, and March. Departures on Monday, Tuesday, Wednesday, and Sunday.
Some small OTAs on Skyscanner and Google have this for $613; cheaper than the airline. If you plan on booking there, beware of any site that charges a fee to cancel a ticket within the 24-hour “free” period. Use unknown booking sites at your own risk.
Click for more details and booking links Cheap Flights: Chicago to New Delhi, Hyderabad, or Bengaluru $613-$676 r/t [Oct, Jan-Mar] – Air India