Flight Changi Airport departs from Singapore Changi Airport at 09:00 and arrives at Kuala Lumpur Kuala Lumpur International Airport at 10:10.
The flighttime is about 1h 10m. The distance travelled ("as the bird flies"): 256 Km. So the average speed is roughly 219 Km.
The best day to arrive at Singapore is Saturday and it would be best to avoid Tuesday, as prices are on average 365.25% higher than on Saturday. (Average prices, based on 90519879 datapoints.)
We have a lot more statistics for flights SQ 8508 and between Singapore and Kuala Lumpur.