Flight Changi Airport departs from Singapore Changi Airport at 21:15 and arrives at Kuala Lumpur Kuala Lumpur International Airport at 22:15.
The flighttime is about 1h 00m. The distance travelled ("as the bird flies"): 256 Km. So the average speed is roughly 256 Km.
The best day to arrive at Singapore is Saturday and it would be best to avoid Sunday, as prices are on average 134.77% higher than on Saturday. (Average prices, based on 80482649 datapoints.)
We have a lot more statistics for flights QF 610 and between Singapore and Kuala Lumpur.