Flight Achmad Yani International Airport departs from Semarang Achmad Yani International Airport at 11:45 and arrives at Jakarta Halim Perdanakusuma International Airport at 13:00.
The flighttime is about 1h 15m. The distance travelled ("as the bird flies"): 389 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 Saturday, as prices are on average 173.6% higher than on Friday. (Average prices, based on 44662534 datapoints.)
We have a lot more statistics for flights GA 2354 and between Semarang and Jakarta.