Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 05:00 and arrives at Medan Kualanamu International Airport at 07:20.
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 Saturday and it would be best to avoid Friday, as prices are on average 11.19% higher than on Saturday. (Average prices, based on 743452331 datapoints.)
We have a lot more statistics for flights JT 3204 and between Jakarta and Medan.