Flight Guangzhou Baiyun International Airport departs from Guangzhou Guangzhou Baiyun International Airport at 21:15 and arrives at Melbourne Melbourne Airport at 08:40.
The flighttime is about 9h 25m. The distance travelled ("as the bird flies"): 5195 Km. So the average speed is roughly 552 Km.
There is an 2 hour time difference between Guangzhou and Melbourne