Flight Perth Airport departs from Perth Perth Airport at 08:35 and arrives at Melbourne Melbourne Airport at 15:10.
The flighttime is about 4h 35m. The distance travelled ("as the bird flies"): 3233 Km. So the average speed is roughly 705 Km.
There is an 2 hour time difference between Perth and Melbourne
The best day to arrive at Perth is Sunday and it would be best to avoid Thursday, as prices are on average 279.61% higher than on Sunday. (Average prices, based on 800929 datapoints.)
We have a lot more statistics for flights QF 772 and between Perth and Melbourne.