Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 01:20 and arrives at Hong Kong Hong Kong International Airport at 07:15.
The flighttime is about 4h 55m. The distance travelled ("as the bird flies"): 1340 Km. So the average speed is roughly 273 Km.
There is an 1 hour time difference between Jakarta and Hong Kong
The best day to arrive at Jakarta is Monday and it would be best to avoid Sunday, as prices are on average 43.8% higher than on Monday. (Average prices, based on 19005636 datapoints.)
This graph shows the distribution of prices found in the past years for this flight. (Average prices, based on 622 datapoints.)
We have a lot more statistics for flights GA 876 and between Jakarta and Hong Kong.