Flight International Airport departs from Osaka International Airport at 19:30 and arrives at Tokyo Haneda Airport at 20:45.
The flighttime is about 1h 15m. The distance travelled ("as the bird flies"): 485 Km. So the average speed is roughly 388 Km.
The best day to arrive at Osaka is Tuesday and it would be best to avoid Friday, as prices are on average 46.65% higher than on Tuesday. (Average prices, based on 1889404 datapoints.)
We have a lot more statistics for flights JL 134 and between Osaka and Tokyo.