Flight Perth Airport departs from Perth Perth Airport at 17:15 and arrives at Singapore Changi Airport at 00:55.The flight has a short stop at Denpasar Bali.
The flighttime is about 7h 40m. The distance travelled ("as the bird flies"): 1789 Km. So the average speed is roughly 233 Km.
The best day to arrive at Perth is Sunday and it would be best to avoid Saturday, as prices are on average 327.48% higher than on Sunday. (Average prices, based on 267966 datapoints.)
We have a lot more statistics for flights QF 275 and between Perth and Singapore.