Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 00:05 and arrives at Hong Kong Hong Kong International Airport at 06:05.
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 Jakarta and Hong Kong