Flight Sydney Airport departs from Sydney Sydney Airport at 07:15 and arrives at Perth Perth Airport at 09:20.
The flighttime is about 4h 05m. The distance travelled ("as the bird flies"): 3917 Km. So the average speed is roughly 959 Km.
There is an 2 hour time difference between Sydney and Perth
The best day to arrive at Sydney is Tuesday and it would be best to avoid Sunday, as prices are on average 11.65% higher than on Tuesday. (Average prices, based on 7239176 datapoints.)
We have a lot more statistics for flights GA 551 and between Sydney and Perth.