Flight International Airport departs from Osaka International Airport at 18:00 and arrives at Tokyo Narita International Airport at 19:15.
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 Friday and it would be best to avoid Sunday, as prices are on average 32.02% higher than on Friday. (Average prices, based on 380866 datapoints.)
We have a lot more statistics for flights NH 36 and between Osaka and Tokyo.