Flight Shahjalal International Airport departs from Dhaka Shahjalal International Airport at 23:15 and arrives at Tokyo Narita International Airport at 08:15.
The flighttime is about 6h 00m. The distance travelled ("as the bird flies"): 5559 Km. So the average speed is roughly 926 Km.
There is an 3 hour time difference between Dhaka and Tokyo
