Flight Haneda Airport departs from Tokyo Haneda Airport at 13:40 and arrives at Osaka Kansai International Airport at 15:05.
The flighttime is about 1h 25m. The distance travelled ("as the bird flies"): 511 Km. So the average speed is roughly 361 Km.
The best day to arrive at Tokyo is Sunday and it would be best to avoid Tuesday, as prices are on average 109.91% higher than on Sunday. (Average prices, based on 7538373 datapoints.)
We have a lot more statistics for flights NH 991 and between Tokyo and Osaka.
