Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 21:45 and arrives at Singapore Changi Airport at 00:40.
The flighttime is about 1h 55m. The distance travelled ("as the bird flies"): 369 Km. So the average speed is roughly 193 Km.
There is an 1 hour time difference between Jakarta and Singapore
The best day to arrive at Jakarta is Friday and it would be best to avoid Tuesday, as prices are on average 141.21% higher than on Friday. (Average prices, based on 584528461 datapoints.)
We have a lot more statistics for flights QF 5206 and between Jakarta and Singapore.