Flight Narita International Airport departs from Tokyo Narita International Airport at 08:15 and arrives at Osaka Kansai International Airport at 09:50.
The flighttime is about 1h 35m. The distance travelled ("as the bird flies"): 582 Km. So the average speed is roughly 368 Km.
The best day to arrive at Tokyo is Monday and it would be best to avoid Sunday, as prices are on average 302.32% higher than on Monday. (Average prices, based on 3380300 datapoints.)
We have a lot more statistics for flights MM 312 and between Tokyo and Osaka.