Flight Sydney Airport departs from Sydney Sydney Airport at 09:30 and arrives at Melbourne Melbourne Airport at 11:05.
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 Tuesday and it would be best to avoid Monday, as prices are on average 69.14% higher than on Tuesday. (Average prices, based on 33884623 datapoints.)
This graph shows the distribution of prices found in the past years for this flight. (Average prices, based on 140 datapoints.)
We have a lot more statistics for flights QF 431 and between Sydney and Melbourne.