Flight Achmad Yani International Airport departs from Semarang Achmad Yani International Airport at 18:00 and arrives at Jakarta Soekarno–Hatta International Airport at 19:20.
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 Thursday and it would be best to avoid Monday, as prices are on average 57.21% higher than on Thursday. (Average prices, based on 135177698 datapoints.)
We have a lot more statistics for flights EY 8121 and between Semarang and Jakarta.
