Flight Kansai International Airport departs from Osaka Kansai International Airport at 19:00 and arrives at Tokyo Haneda Airport at 20:15.
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 Sunday and it would be best to avoid Thursday, as prices are on average 145.52% higher than on Sunday. (Average prices, based on 5974476 datapoints.)
We have a lot more statistics for flights 7G 3828 and between Osaka and Tokyo.