Flight International Airport departs from Osaka International Airport at 08:00 and arrives at Tokyo Narita International Airport at 09:15.
The flighttime is about 1h 15m. The distance travelled ("as the bird flies"): 556 Km. So the average speed is roughly 445 Km.
The best day to arrive at Osaka is Sunday and it would be best to avoid Tuesday, as prices are on average 15.48% higher than on Sunday. (Average prices, based on 408389 datapoints.)
We have a lot more statistics for flights NH 16 and between Osaka and Tokyo.