Flight Haneda Airport departs from Tokyo Haneda Airport at 06:45 and arrives at Kagoshima Kagoshima Airport at 08:35.
The flighttime is about 1h 50m. The distance travelled ("as the bird flies"): 1048 Km. So the average speed is roughly 572 Km.
The best day to arrive at Tokyo is Sunday and it would be best to avoid Wednesday, as prices are on average 56.19% higher than on Sunday. (Average prices, based on 392239 datapoints.)
We have a lot more statistics for flights EH 619 and between Tokyo and Kagoshima.