Flight Kansai International Airport departs from Osaka Kansai International Airport at 06:45 and arrives at Tokyo Narita International Airport at 07:55.
The flighttime is about 1h 10m. The distance travelled ("as the bird flies"): 582 Km. So the average speed is roughly 499 Km.
The best day to arrive at Osaka is Sunday and it would be best to avoid Monday, as prices are on average 91.49% higher than on Sunday. (Average prices, based on 8276889 datapoints.)
We have a lot more statistics for flights NH 990 and between Osaka and Tokyo.