Flight Narita International Airport departs from Tokyo Narita International Airport at 08:00 and arrives at Osaka Kansai International Airport at 09:35.
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 Tuesday and it would be best to avoid Saturday, as prices are on average 114.5% higher than on Tuesday. (Average prices, based on 3376711 datapoints.)
We have a lot more statistics for flights JQ 217 and between Tokyo and Osaka.