Flight Narita International Airport departs from Tokyo Narita International Airport at 19:00 and arrives at Singapore Changi Airport at 00:55.
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 Tokyo and Singapore
The best day to arrive at Tokyo is Sunday and it would be best to avoid Saturday, as prices are on average 127.75% higher than on Sunday. (Average prices, based on 405197 datapoints.)
We have a lot more statistics for flights SQ 11 and between Tokyo and Singapore.
