Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 11:10 and arrives at Surabaya Juanda International Airport at 12:50.
The flighttime is about 1h 40m. The distance travelled ("as the bird flies"): 682 Km. So the average speed is roughly 409 Km.
The best month to arrive at Jakarta is March and the most expensive month to fly is May. (Average prices, based on 7297 datapoints.)
We have a lot more statistics for flights KL 4060 and between Jakarta and Surabaya.