Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 17:30 and arrives at Semarang Achmad Yani International Airport at 18:40.
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 Jakarta is Saturday and it would be best to avoid Tuesday, as prices are on average 23.65% higher than on Saturday. (Average prices, based on 160317258 datapoints.)
This graph shows the distribution of prices found in the past years for this flight. (Average prices, based on 121 datapoints.)
We have a lot more statistics for flights OD 6352 and between Jakarta and Semarang.