Flight Kansai International Airport departs from Osaka Kansai International Airport at 12:00 and arrives at Jakarta Soekarno–Hatta International Airport at 17:30.
The flighttime is about 7h 30m. The distance travelled ("as the bird flies"): 3779 Km. So the average speed is roughly 504 Km.
There is an 2 hour time difference between Osaka and Jakarta