Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 11:45 and arrives at Singapore Changi Airport at 14:35.
The flighttime is about 1h 50m. The distance travelled ("as the bird flies"): 369 Km. So the average speed is roughly 201 Km.
There is an 1 hour time difference between Jakarta and Singapore
The best day to arrive at Jakarta is Wednesday and it would be best to avoid Tuesday, as prices are on average 134.16% higher than on Wednesday. (Average prices, based on 580466132 datapoints.)
We have a lot more statistics for flights 8B 9155 and between Jakarta and Singapore.