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 04:55.
The flighttime is about 3h 15m. The distance travelled ("as the bird flies"): 1930 Km. So the average speed is roughly 594 Km.
There is an 1.5 hour time difference between Hanoi and Kolkata
