Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 11:00 and arrives at Jakarta Halim Perdanakusuma International Airport at 13:20.
The flighttime is about 2h 20m. The distance travelled ("as the bird flies"): 26 Km. So the average speed is roughly 11 Km.
The best day to arrive at Jakarta is Monday and it would be best to avoid Wednesday, as prices are on average 33.57% higher than on Monday. (Average prices, based on 212870 datapoints.)
We have a lot more statistics for flights QG 9912 and between Jakarta and Jakarta.