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