Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 16:50 and arrives at Singapore Changi Airport at 19:30.
The flighttime is about 1h 40m. The distance travelled ("as the bird flies"): 369 Km. So the average speed is roughly 221 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 Saturday, as prices are on average 31.99% higher than on Wednesday. (Average prices, based on 580455187 datapoints.)
We have a lot more statistics for flights GA 8818 and between Jakarta and Singapore.