Flight Changi Airport departs from Singapore Changi Airport at 01:10 and arrives at London Heathrow Airport at 07:45.
The flighttime is about 13h 35m. The distance travelled ("as the bird flies"): 11049 Km. So the average speed is roughly 813 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 Saturday, as prices are on average 476.5% higher than on Wednesday. (Average prices, based on 166853 datapoints.)
We have a lot more statistics for flights SQ 306 and between Singapore and London.