Flight Changi Airport departs from Singapore Changi Airport at 09:00 and arrives at London Heathrow Airport at 15:40.
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 Wednesday and it would be best to avoid Friday, as prices are on average 153.25% higher than on Wednesday. (Average prices, based on 164448 datapoints.)
We have a lot more statistics for flights SQ 308 and between Singapore and London.