Flight Kansai International Airport departs from Osaka Kansai International Airport at 15:50 and arrives at Singapore Changi Airport at 21:25.
The flighttime is about 6h 35m. The distance travelled ("as the bird flies"): 3803 Km. So the average speed is roughly 578 Km.
There is an 1 hour time difference between Osaka and Singapore
The best day to arrive at Osaka is Saturday and it would be best to avoid Friday, as prices are on average 513.47% higher than on Saturday. (Average prices, based on 263995 datapoints.)
We have a lot more statistics for flights TR 821 and between Osaka and Singapore.
