Flight Hong Kong International Airport departs from Hong Kong Hong Kong International Airport at 09:20 and arrives at Jakarta Soekarno–Hatta International Airport at 13:20.
The flighttime is about 5h 00m. The distance travelled ("as the bird flies"): 1340 Km. So the average speed is roughly 268 Km.
There is an 1 hour time difference between Hong Kong and Jakarta