Flight Brisbane Airport departs from Brisbane Brisbane Airport at 10:00 and arrives at Melbourne Melbourne Airport at 12:25.
The flighttime is about 2h 25m. The distance travelled ("as the bird flies"): 1343 Km. So the average speed is roughly 556 Km.
The best day to arrive at Brisbane is Sunday and it would be best to avoid Friday, as prices are on average 54.68% higher than on Sunday. (Average prices, based on 1153391 datapoints.)
We have a lot more statistics for flights QF 615 and between Brisbane and Melbourne.