Flight Changi Airport departs from Singapore Changi Airport at 09:25 and arrives at Tokyo Narita International Airport at 17:30.
The flighttime is about 7h 05m. The distance travelled ("as the bird flies"): 4385 Km. So the average speed is roughly 619 Km.
There is an 1 hour time difference between Singapore and Tokyo
The best day to arrive at Singapore is Saturday and it would be best to avoid Thursday, as prices are on average 65.47% higher than on Saturday. (Average prices, based on 495956 datapoints.)
This graph shows the distribution of prices found in the past years for this flight. (Average prices, based on 102 datapoints.)
We have a lot more statistics for flights SQ 12 and between Singapore and Tokyo.