Flight Changi Airport departs from Singapore Changi Airport at 12:35 and arrives at London Heathrow Airport at 19:15.
The flighttime is about 13h 40m. The distance travelled ("as the bird flies"): 11049 Km. So the average speed is roughly 808 Km.
There is an 7 hour time difference between Singapore and London
The best day to arrive at Singapore is Thursday and it would be best to avoid Saturday, as prices are on average 57.24% higher than on Thursday. (Average prices, based on 166990 datapoints.)
We have a lot more statistics for flights SQ 318 and between Singapore and London.