Flight Changi Airport departs from Singapore Changi Airport at 00:25 and arrives at Perth Perth Airport at 05:25.
The flighttime is about 5h 00m. The distance travelled ("as the bird flies"): 1789 Km. So the average speed is roughly 358 Km.
The best day to arrive at Singapore is Monday and it would be best to avoid Thursday, as prices are on average 183.16% higher than on Monday. (Average prices, based on 275312 datapoints.)
We have a lot more statistics for flights SQ 225 and between Singapore and Perth.