Flight Juanda International Airport departs from Surabaya Juanda International Airport at 07:35 and arrives at Semarang Achmad Yani International Airport at 08:45.
The flighttime is about 1h 10m. The distance travelled ("as the bird flies"): 267 Km. So the average speed is roughly 229 Km.
The best month to arrive at Surabaya is October and the most expensive month to fly is May. (Average prices, based on 17106 datapoints.)
We have a lot more statistics for flights IW 1839 and between Surabaya and Semarang.