Flight Changi Airport departs from Singapore Changi Airport at 21:15 and arrives at Kuala Lumpur Kuala Lumpur International Airport at 22:15.
The flighttime is about 1h 00m. The distance travelled ("as the bird flies"): 256 Km. So the average speed is roughly 256 Km.
The best day to arrive at Singapore is Thursday and it would be best to avoid Monday, as prices are on average 181.36% higher than on Thursday. (Average prices, based on 81343571 datapoints.)
We have a lot more statistics for flights BA 7904 and between Singapore and Kuala Lumpur.