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 Thursday and it would be best to avoid Tuesday, as prices are on average 44.67% higher than on Thursday. (Average prices, based on 80796889 datapoints.)
We have a lot more statistics for flights SQ 128 and between Singapore and Kuala Lumpur.