The calculated distance (air line) between Hachiōji and Minamiuonuma is approximately 102 miles respectively 164 kilometers.
By car or train, the actual journey to Minamiuonuma is certainly longer, as only the direct route (as the crow flies) between Hachiōji and Minamiuonuma has been calculated here.
Air line (approximately)
164 kilometers
88 nautical miles