Flight Sydney Airport departs from Sydney Sydney Airport at 19:40 and arrives at Perth Perth Airport at 21:25.
The flighttime is about 3h 45m. The distance travelled ("as the bird flies"): 3917 Km. So the average speed is roughly 1045 Km.
There is an 2 hour time difference between Sydney and Perth
The best day to arrive at Sydney is Monday and it would be best to avoid Friday, as prices are on average 107.77% higher than on Monday. (Average prices, based on 7213238 datapoints.)
We have a lot more statistics for flights QF 583 and between Sydney and Perth.