Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 13:00 and arrives at Semarang Achmad Yani International Airport at 14:10.
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 Sunday and it would be best to avoid Monday, as prices are on average 62.08% higher than on Sunday. (Average prices, based on 127582884 datapoints.)
This graph shows the distribution of prices found in the past years for this flight. (Average prices, based on 128 datapoints.)
We have a lot more statistics for flights JT 512 and between Jakarta and Semarang.