Flight Changi Airport departs from Singapore Changi Airport at 11:05 and arrives at Kuala Lumpur Kuala Lumpur International Airport at 12:25.
The flighttime is about 1h 20m. The distance travelled ("as the bird flies"): 256 Km. So the average speed is roughly 192 Km.
The best day to arrive at Singapore is Tuesday and it would be best to avoid Friday, as prices are on average 137.21% higher than on Tuesday. (Average prices, based on 90548346 datapoints.)
We have a lot more statistics for flights WY 5612 and between Singapore and Kuala Lumpur.