Flight Changi Airport departs from Singapore Changi Airport at 20:00 and arrives at Kuala Lumpur Kuala Lumpur International Airport at 20:55.
The flighttime is about 0h 55m. The distance travelled ("as the bird flies"): 256 Km. So the average speed is roughly 279 Km.
The best day to arrive at Singapore is Sunday and it would be best to avoid Tuesday, as prices are on average 155.52% higher than on Sunday. (Average prices, based on 80541984 datapoints.)
We have a lot more statistics for flights SQ 128 and between Singapore and Kuala Lumpur.