Flight Kuala Lumpur International Airport departs from Kuala Lumpur Kuala Lumpur International Airport at 19:05 and arrives at Jakarta Soekarno–Hatta International Airport at 20:15.
The flighttime is about 2h 10m. The distance travelled ("as the bird flies"): 600 Km. So the average speed is roughly 277 Km.
There is an 1 hour time difference between Kuala Lumpur and Jakarta