Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 08:10 and arrives at Hong Kong Hong Kong International Airport at 14:20.
The flighttime is about 5h 10m. The distance travelled ("as the bird flies"): 1340 Km. So the average speed is roughly 259 Km.
There is an 1 hour time difference between Jakarta and Hong Kong