Flight Kansai International Airport departs from Osaka Kansai International Airport at 11:55 and arrives at Tokyo Narita International Airport at 13:25.
The flighttime is about 1h 30m. The distance travelled ("as the bird flies"): 582 Km. So the average speed is roughly 388 Km.
The best day to arrive at Osaka is Monday and it would be best to avoid Saturday, as prices are on average 240.17% higher than on Monday. (Average prices, based on 8293403 datapoints.)
We have a lot more statistics for flights JQ 228 and between Osaka and Tokyo.