Flight Sydney Airport departs from Sydney Sydney Airport at 11:45 and arrives at Melbourne Melbourne Airport at 13:20.
The flighttime is about 1h 35m. The distance travelled ("as the bird flies"): 787 Km. So the average speed is roughly 497 Km.
The best day to arrive at Sydney is Friday and it would be best to avoid Thursday, as prices are on average 62.88% higher than on Friday. (Average prices, based on 36728507 datapoints.)
We have a lot more statistics for flights QF 453 and between Sydney and Melbourne.