Flight Changi Airport departs from Singapore Changi Airport at 06:40 and arrives at Tokyo Narita International Airport at 14:35.
The flighttime is about 6h 55m. The distance travelled ("as the bird flies"): 4385 Km. So the average speed is roughly 634 Km.
There is an 1 hour time difference between Singapore and Tokyo
The best day to arrive at Singapore is Thursday and it would be best to avoid Wednesday, as prices are on average 57.26% higher than on Thursday. (Average prices, based on 490295 datapoints.)
We have a lot more statistics for flights SQ 5904 and between Singapore and Tokyo.