Flight Achmad Yani International Airport departs from Semarang Achmad Yani International Airport at 15:25 and arrives at Jakarta Soekarno–Hatta International Airport at 16:50.
The flighttime is about 1h 25m. The distance travelled ("as the bird flies"): 415 Km. So the average speed is roughly 293 Km.
The best month to arrive at Semarang is April and the most expensive month to fly is December. (Average prices, based on 1372 datapoints.)
We have a lot more statistics for flights KE 245 and between Semarang and Jakarta.