Flight Changi Airport departs from Singapore Changi Airport at 06:15 and arrives at Tokyo Narita International Airport at 14:30.
The flighttime is about 7h 15m. The distance travelled ("as the bird flies"): 4385 Km. So the average speed is roughly 605 Km.
There is an 1 hour time difference between Singapore and Tokyo
The best day to arrive at Singapore is Sunday and it would be best to avoid Thursday, as prices are on average 420.94% higher than on Sunday. (Average prices, based on 510998 datapoints.)
We have a lot more statistics for flights NQ 802 and between Singapore and Tokyo.