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