Flight Kansai International Airport departs from Osaka Kansai International Airport at 15:40 and arrives at Tokyo Haneda Airport at 16:55.
The flighttime is about 1h 15m. The distance travelled ("as the bird flies"): 511 Km. So the average speed is roughly 409 Km.
The best day to arrive at Osaka is Wednesday and it would be best to avoid Saturday, as prices are on average 52.93% higher than on Wednesday. (Average prices, based on 6520847 datapoints.)
We have a lot more statistics for flights NH 992 and between Osaka and Tokyo.