Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 16:35 and arrives at Medan Kualanamu International Airport at 19:10.
The flighttime is about 2h 35m. The distance travelled ("as the bird flies"): 895 Km. So the average speed is roughly 346 Km.
The best day to arrive at Jakarta is Sunday and it would be best to avoid Wednesday, as prices are on average 53.04% higher than on Sunday. (Average prices, based on 752620941 datapoints.)
We have a lot more statistics for flights GA 1844 and between Jakarta and Medan.