Flight Brisbane Airport departs from Brisbane Brisbane Airport at 06:15 and arrives at Sydney Sydney Airport at 08:00.
The flighttime is about 1h 45m. The distance travelled ("as the bird flies"): 680 Km. So the average speed is roughly 389 Km.
The best day to arrive at Brisbane is Saturday and it would be best to avoid Thursday, as prices are on average 99.51% higher than on Saturday. (Average prices, based on 6691425 datapoints.)
We have a lot more statistics for flights QF 503 and between Brisbane and Sydney.
