Flight Bandaranaike International Airport departs from Colombo Bandaranaike International Airport at 00:25 and arrives at Melbourne Melbourne Airport at 14:40.
The flighttime is about 9h 45m. The distance travelled ("as the bird flies"): 6925 Km. So the average speed is roughly 710 Km.
There is an 4.5 hour time difference between Colombo and Melbourne