Flight Soekarno–Hatta International Airport departs from Jakarta Soekarno–Hatta International Airport at 18:40 and arrives at Perth Perth Airport at 00:10.
The flighttime is about 4h 30m. The distance travelled ("as the bird flies"): 1448 Km. So the average speed is roughly 322 Km.
There is an 1 hour time difference between Jakarta and Perth
The best day to arrive at Jakarta is Tuesday and it would be best to avoid Wednesday, as prices are on average 6.25% higher than on Tuesday. (Average prices, based on 207698 datapoints.)
We have a lot more statistics for flights QG 5639 and between Jakarta and Perth.