The calculated distance (air line) between Radzyń Podlaski and Sosnowiec is approximately 184 miles respectively 297 kilometers.
By car or train, the actual journey to Sosnowiec is certainly longer, as only the direct route (as the crow flies) between Radzyń Podlaski and Sosnowiec has been calculated here.
Air line (approximately)
297 kilometers
160 nautical miles