Flight Achmad Yani International Airport departs from Semarang Achmad Yani International Airport at 13:05 and arrives at Jakarta Soekarno–Hatta International Airport at 14:25.
The flighttime is about 1h 20m. The distance travelled ("as the bird flies"): 415 Km. So the average speed is roughly 311 Km.
The best day to arrive at Semarang is Friday and it would be best to avoid Thursday, as prices are on average 12.51% higher than on Friday. (Average prices, based on 120168842 datapoints.)
We have a lot more statistics for flights GA 2854 and between Semarang and Jakarta.