Flight Juanda International Airport departs from Surabaya Juanda International Airport at 15:00 and arrives at Jakarta Soekarno–Hatta International Airport at 16:30.
The flighttime is about 1h 30m. The distance travelled ("as the bird flies"): 682 Km. So the average speed is roughly 455 Km.
The best day to arrive at Surabaya is Wednesday and it would be best to avoid Sunday, as prices are on average 144.56% higher than on Wednesday. (Average prices, based on 548264047 datapoints.)
We have a lot more statistics for flights IU 339 and between Surabaya and Jakarta.