Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 07:05 and arrives at Medan Kualanamu International Airport at 09:30.
The flighttime is about 2h 25m. The distance travelled ("as the bird flies"): 895 Km. So the average speed is roughly 370 Km.
The best month to arrive at Jakarta is February and the most expensive month to fly is December. (Average prices, based on 4245 datapoints.)
We have a lot more statistics for flights QR 182 and between Jakarta and Medan.