Flight Noi Bai International Airport departs from Hanoi Noi Bai International Airport at 03:10 and arrives at Kolkata Netaji Subhas Chandra Bose International Airport at 04:25.
The flighttime is about 2h 45m. The distance travelled ("as the bird flies"): 1930 Km. So the average speed is roughly 702 Km.
There is an 1.5 hour time difference between Hanoi and Kolkata