Flight Kuala Lumpur International Airport departs from Kuala Lumpur Kuala Lumpur International Airport at 18:40 and arrives at Singapore Changi Airport at 19:45.
The flighttime is about 1h 05m. The distance travelled ("as the bird flies"): 256 Km. So the average speed is roughly 236 Km.
The best day to arrive at Kuala Lumpur is Sunday and it would be best to avoid Friday, as prices are on average 431.79% higher than on Sunday. (Average prices, based on 91746230 datapoints.)
We have a lot more statistics for flights SQ 121 and between Kuala Lumpur and Singapore.