Flight International Airport departs from Osaka International Airport at 16:25 and arrives at Tokyo Haneda 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 Osaka is Wednesday and it would be best to avoid Sunday, as prices are on average 39.2% higher than on Wednesday. (Average prices, based on 2214914 datapoints.)
We have a lot more statistics for flights JL 126 and between Osaka and Tokyo.