The calculated distance (air line) between Mokotów and Ostrów Wielkopolski is approximately 142 miles respectively 229 kilometers.
By car or train, the actual journey to Ostrów Wielkopolski is certainly longer, as only the direct route (as the crow flies) between Mokotów and Ostrów Wielkopolski has been calculated here.
Air line (approximately)
229 kilometers
124 nautical miles