Flight Narita International Airport departs from Tokyo Narita International Airport at 17:35 and arrives at Osaka International Airport at 18:55.
The flighttime is about 1h 20m. The distance travelled ("as the bird flies"): 556 Km. So the average speed is roughly 417 Km.
The best day to arrive at Tokyo is Saturday and it would be best to avoid Tuesday, as prices are on average 83.72% higher than on Saturday. (Average prices, based on 593385 datapoints.)
We have a lot more statistics for flights EH 2177 and between Tokyo and Osaka.