Flight Kuala Lumpur International Airport departs from Kuala Lumpur Kuala Lumpur International Airport at 13:45 and arrives at Jakarta Soekarno–Hatta International Airport at 15:05.
The flighttime is about 2h 20m. The distance travelled ("as the bird flies"): 600 Km. So the average speed is roughly 257 Km.
There is an 1 hour time difference between Kuala Lumpur and Jakarta