Flight Kansai International Airport departs from Osaka Kansai International Airport at 16:50 and arrives at Singapore Changi Airport at 22:40.
The flighttime is about 6h 50m. The distance travelled ("as the bird flies"): 3803 Km. So the average speed is roughly 557 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 Tuesday, as prices are on average 874.68% higher than on Saturday. (Average prices, based on 203285 datapoints.)
We have a lot more statistics for flights SQ 621 and between Osaka and Singapore.