Flight Haneda Airport departs from Tokyo Haneda Airport at 21:00 and arrives at Osaka Kansai International Airport at 22:20.
The flighttime is about 1h 20m. The distance travelled ("as the bird flies"): 511 Km. So the average speed is roughly 383 Km.
The best day to arrive at Tokyo is Sunday and it would be best to avoid Tuesday, as prices are on average 102.31% higher than on Sunday. (Average prices, based on 7546459 datapoints.)
We have a lot more statistics for flights NH 99 and between Tokyo and Osaka.
