Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 13:25 and arrives at Semarang Achmad Yani International Airport at 14:40.
The flighttime is about 1h 15m. The distance travelled ("as the bird flies"): 415 Km. So the average speed is roughly 332 Km.
The best day to arrive at Jakarta is Monday and it would be best to avoid Sunday, as prices are on average 19.14% higher than on Monday. (Average prices, based on 208806525 datapoints.)
We have a lot more statistics for flights MH 5870 and between Jakarta and Semarang.
