Flight Perth Airport departs from Perth Perth Airport at 07:30 and arrives at Melbourne Melbourne Airport at 13:05.
The flighttime is about 3h 35m. The distance travelled ("as the bird flies"): 3233 Km. So the average speed is roughly 902 Km.
There is an 2 hour time difference between Perth and Melbourne
The best day to arrive at Perth is Tuesday and it would be best to avoid Monday, as prices are on average 101.1% higher than on Tuesday. (Average prices, based on 801479 datapoints.)
We have a lot more statistics for flights GA 680 and between Perth and Melbourne.