Flight Haneda Airport departs from Tokyo Haneda Airport at 16:25 and arrives at Osaka International Airport at 17:35.
The flighttime is about 1h 10m. The distance travelled ("as the bird flies"): 485 Km. So the average speed is roughly 416 Km.
The best day to arrive at Tokyo is Sunday and it would be best to avoid Tuesday, as prices are on average 73.2% higher than on Sunday. (Average prices, based on 2270122 datapoints.)
We have a lot more statistics for flights JL 127 and between Tokyo and Osaka.
