Flight Sydney Airport departs from Sydney Sydney Airport at 10:05 and arrives at Gold Coast Gold Coast Airport at 11:30.
The flighttime is about 1h 25m. The distance travelled ("as the bird flies"): 623 Km. So the average speed is roughly 440 Km.
The best day to arrive at Sydney is Thursday and it would be best to avoid Wednesday, as prices are on average 211.7% higher than on Thursday. (Average prices, based on 855856 datapoints.)
We have a lot more statistics for flights QF 592 and between Sydney and Gold Coast.