Flight Netaji Subhas Chandra Bose International Airport departs from Kolkata Netaji Subhas Chandra Bose International Airport at 00:10 and arrives at Hong Kong Hong Kong International Airport at 06:30.
The flighttime is about 3h 50m. The distance travelled ("as the bird flies"): 2831 Km. So the average speed is roughly 739 Km.
There is an 2.5 hour time difference between Kolkata and Hong Kong