Flight Narita International Airport departs from Tokyo Narita International Airport at 17:00 and arrives at Singapore Changi Airport at 23:15.
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 Tokyo and Singapore
The best day to arrive at Tokyo is Thursday and it would be best to avoid Tuesday, as prices are on average 103.07% higher than on Thursday. (Average prices, based on 208808 datapoints.)
We have a lot more statistics for flights NQ 803 and between Tokyo and Singapore.