The calculated distance (air line) between Kamianets-Podilskyi and Zastavna is approximately 36 miles respectively 57 kilometers.
By car or train, the actual journey to Zastavna is certainly longer, as only the direct route (as the crow flies) between Kamianets-Podilskyi and Zastavna has been calculated here.
Air line (approximately)
57 kilometers
31 nautical miles