Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 20:35 and arrives at Medan Kualanamu International Airport at 22:55.
The flighttime is about 2h 20m. The distance travelled ("as the bird flies"): 895 Km. So the average speed is roughly 384 Km.
The best day to arrive at Jakarta is Tuesday and it would be best to avoid Thursday, as prices are on average 54.85% higher than on Tuesday. (Average prices, based on 752895207 datapoints.)
We have a lot more statistics for flights IU 3886 and between Jakarta and Medan.