Flight Sydney Airport departs from Sydney Sydney Airport at 19:15 and arrives at Melbourne Melbourne Airport at 20:50.
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 Saturday and it would be best to avoid Monday, as prices are on average 105.86% higher than on Saturday. (Average prices, based on 35869372 datapoints.)
This graph shows the distribution of prices found in the past years for this flight. (Average prices, based on 162 datapoints.)
We have a lot more statistics for flights QF 489 and between Sydney and Melbourne.