Flight Achmad Yani International Airport departs from Semarang Achmad Yani International Airport at 07:50 and arrives at Jakarta Soekarno–Hatta International Airport at 09:00.
The flighttime is about 1h 10m. The distance travelled ("as the bird flies"): 415 Km. So the average speed is roughly 356 Km.
The best day to arrive at Semarang is Monday and it would be best to avoid Thursday, as prices are on average 95.2% higher than on Monday. (Average prices, based on 105236979 datapoints.)
We have a lot more statistics for flights QG 805 and between Semarang and Jakarta.