Flight Brisbane Airport departs from Brisbane Brisbane Airport at 10:20 and arrives at Melbourne Melbourne Airport at 13:40.
The flighttime is about 3h 20m. The distance travelled ("as the bird flies"): 1343 Km. So the average speed is roughly 403 Km.
The best day to arrive at Brisbane is Monday and it would be best to avoid Friday, as prices are on average 84.86% higher than on Monday. (Average prices, based on 1152764 datapoints.)
We have a lot more statistics for flights QF 617 and between Brisbane and Melbourne.