The calculated distance (air line) between Starokostyantyniv and Khmelnytskyi is approximately 26 miles respectively 41 kilometers.
By car or train, the actual journey to Khmelnytskyi is certainly longer, as only the direct route (as the crow flies) between Starokostyantyniv and Khmelnytskyi has been calculated here.
Air line (approximately)
41 kilometers
22 nautical miles