Flight Perth Airport departs from Perth Perth Airport at 06:45 and arrives at Melbourne Melbourne Airport at 12:15.
The flighttime is about 3h 30m. The distance travelled ("as the bird flies"): 3233 Km. So the average speed is roughly 924 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 Tuesday, as prices are on average 313.52% higher than on Sunday. (Average prices, based on 800996 datapoints.)
We have a lot more statistics for flights QF 770 and between Perth and Melbourne.