Flight Sydney Airport departs from Sydney Sydney Airport at 11:00 and arrives at Melbourne Melbourne Airport at 12:35.
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 Thursday and it would be best to avoid Tuesday, as prices are on average 82.45% higher than on Thursday. (Average prices, based on 36958242 datapoints.)
We have a lot more statistics for flights ZL 43 and between Sydney and Melbourne.