Flight International Airport departs from Osaka International Airport at 14:30 and arrives at Tokyo Haneda Airport at 15:35.
The flighttime is about 1h 05m. The distance travelled ("as the bird flies"): 485 Km. So the average speed is roughly 448 Km.
The best day to arrive at Osaka is Friday and it would be best to avoid Thursday, as prices are on average 102.68% higher than on Friday. (Average prices, based on 2210487 datapoints.)
We have a lot more statistics for flights JL 120 and between Osaka and Tokyo.