Flight Narita International Airport departs from Tokyo Narita International Airport at 09:00 and arrives at Singapore Changi Airport at 15:30.
The flighttime is about 7h 30m. The distance travelled ("as the bird flies"): 4385 Km. So the average speed is roughly 585 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 55.95% higher than on Sunday. (Average prices, based on 277214 datapoints.)
We have a lot more statistics for flights TR 809 and between Tokyo and Singapore.