Flight Changi Airport departs from Singapore Changi Airport at 15:30 and arrives at Perth Perth Airport at 20:35.
The flighttime is about 5h 05m. The distance travelled ("as the bird flies"): 1789 Km. So the average speed is roughly 352 Km.
The best day to arrive at Singapore is Tuesday and it would be best to avoid Sunday, as prices are on average 1430.23% higher than on Tuesday. (Average prices, based on 225726 datapoints.)
We have a lot more statistics for flights TR 16 and between Singapore and Perth.