Flight Kuala Lumpur International Airport departs from Kuala Lumpur Kuala Lumpur International Airport at 19:10 and arrives at Singapore Changi Airport at 20:25.
The flighttime is about 1h 15m. The distance travelled ("as the bird flies"): 256 Km. So the average speed is roughly 205 Km.
The best day to arrive at Kuala Lumpur is Monday and it would be best to avoid Wednesday, as prices are on average 428.29% higher than on Monday. (Average prices, based on 84012223 datapoints.)
We have a lot more statistics for flights KL 4124 and between Kuala Lumpur and Singapore.