Flight Haneda Airport departs from Tokyo Haneda Airport at 18:50 and arrives at Kagoshima Kagoshima Airport at 20:50.
The flighttime is about 2h 00m. The distance travelled ("as the bird flies"): 1048 Km. So the average speed is roughly 524 Km.
The best day to arrive at Tokyo is Monday and it would be best to avoid Friday, as prices are on average 185.41% higher than on Monday. (Average prices, based on 392668 datapoints.)
We have a lot more statistics for flights BC 309 and between Tokyo and Kagoshima.