Flight Hong Kong International Airport departs from Hong Kong Hong Kong International Airport at 15:45 and arrives at Jakarta Soekarno–Hatta International Airport at 19:35.
The flighttime is about 4h 50m. The distance travelled ("as the bird flies"): 1340 Km. So the average speed is roughly 277 Km.
There is an 1 hour time difference between Hong Kong and Jakarta