Flight Achmad Yani International Airport departs from Semarang Achmad Yani International Airport at 14:05 and arrives at Jakarta Soekarno–Hatta International Airport at 15:30.
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 day to arrive at Semarang is Tuesday and it would be best to avoid Friday, as prices are on average 42.87% higher than on Tuesday. (Average prices, based on 110588270 datapoints.)
We have a lot more statistics for flights GA 2854 and between Semarang and Jakarta.