Flight Sydney Airport departs from Sydney Sydney Airport at 18:45 and arrives at Melbourne Avalon Airport at 20:20.
The flighttime is about 1h 35m. The distance travelled ("as the bird flies"): 839 Km. So the average speed is roughly 530 Km.
The best day to arrive at Sydney is Thursday and it would be best to avoid Sunday, as prices are on average 167.16% higher than on Thursday. (Average prices, based on 782894 datapoints.)
We have a lot more statistics for flights JQ 611 and between Sydney and Melbourne.