Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 11:15 and arrives at Surabaya Juanda International Airport at 12:40.
The flighttime is about 1h 25m. The distance travelled ("as the bird flies"): 682 Km. So the average speed is roughly 481 Km.
The best month to arrive at Jakarta is October and the most expensive month to fly is December. (Average prices, based on 3005 datapoints.)
We have a lot more statistics for flights IU 6596 and between Jakarta and Surabaya.
