The calculated distance (air line) between Częstochowa and Ostrów Wielkopolski is approximately 82 miles respectively 132 kilometers.
By car or train, the actual journey to Ostrów Wielkopolski is certainly longer, as only the direct route (as the crow flies) between Częstochowa and Ostrów Wielkopolski has been calculated here.
Air line (approximately)
132 kilometers
71 nautical miles