Flight Narita International Airport departs from Tokyo Narita International Airport at 17:55 and arrives at Singapore Changi Airport at 00:20.
The flighttime is about 7h 25m. The distance travelled ("as the bird flies"): 4385 Km. So the average speed is roughly 591 Km.
There is an 1 hour time difference between Tokyo and Singapore
The best day to arrive at Tokyo is Thursday and it would be best to avoid Saturday, as prices are on average 41.08% higher than on Thursday. (Average prices, based on 203738 datapoints.)
We have a lot more statistics for flights JL 711 and between Tokyo and Singapore.