Flight Sydney Airport departs from Sydney Sydney Airport at 12:30 and arrives at Perth Perth Airport at 15:45.
The flighttime is about 5h 15m. The distance travelled ("as the bird flies"): 3917 Km. So the average speed is roughly 746 Km.
There is an 2 hour time difference between Sydney and Perth
The best day to arrive at Sydney is Thursday and it would be best to avoid Saturday, as prices are on average 113.12% higher than on Thursday. (Average prices, based on 7180566 datapoints.)
We have a lot more statistics for flights VA 557 and between Sydney and Perth.