Flight Kansai International Airport departs from Osaka Kansai International Airport at 21:05 and arrives at Tokyo Haneda Airport at 22:15.
The flighttime is about 1h 10m. The distance travelled ("as the bird flies"): 511 Km. So the average speed is roughly 438 Km.
The best day to arrive at Osaka is Saturday and it would be best to avoid Monday, as prices are on average 61% higher than on Saturday. (Average prices, based on 6471870 datapoints.)
We have a lot more statistics for flights EH 98 and between Osaka and Tokyo.