Flight Kansai International Airport departs from Osaka Kansai International Airport at 21:00 and arrives at Tokyo Haneda Airport at 22:15.
The flighttime is about 1h 15m. The distance travelled ("as the bird flies"): 511 Km. So the average speed is roughly 409 Km.
The best day to arrive at Osaka is Friday and it would be best to avoid Saturday, as prices are on average 100.4% higher than on Friday. (Average prices, based on 6022329 datapoints.)
We have a lot more statistics for flights EH 98 and between Osaka and Tokyo.