Flight Kuala Lumpur International Airport departs from Kuala Lumpur Kuala Lumpur International Airport at 23:35 and arrives at Tokyo Narita International Airport at 07:15.
The flighttime is about 6h 40m. The distance travelled ("as the bird flies"): 4552 Km. So the average speed is roughly 683 Km.
There is an 1 hour time difference between Kuala Lumpur and Tokyo