Flight Achmad Yani International Airport departs from Semarang Achmad Yani International Airport at 09:45 and arrives at Jakarta Soekarno–Hatta International Airport at 11:00.
The flighttime is about 1h 15m. The distance travelled ("as the bird flies"): 415 Km. So the average speed is roughly 332 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 CX 235 and between Semarang and Jakarta.