The calculated distance (air line) between Ryōtsu-minato and Hachiōji is approximately 174 miles respectively 281 kilometers.
By car or train, the actual journey to Hachiōji is certainly longer, as only the direct route (as the crow flies) between Ryōtsu-minato and Hachiōji has been calculated here.
Air line (approximately)
281 kilometers
151 nautical miles