The calculated distance (air line) between Ostroh and Ivano-Frankivsk is approximately 126 miles respectively 203 kilometers.
By car or train, the actual journey to Ivano-Frankivsk is certainly longer, as only the direct route (as the crow flies) between Ostroh and Ivano-Frankivsk has been calculated here.
Air line (approximately)
203 kilometers
110 nautical miles