Flight Narita International Airport departs from Tokyo Narita International Airport at 21:50 and arrives at Kuala Lumpur Kuala Lumpur International Airport at 04:20.
The flighttime is about 7h 30m. The distance travelled ("as the bird flies"): 4552 Km. So the average speed is roughly 607 Km.
There is an 1 hour time difference between Tokyo and Kuala Lumpur