The calculated distance (air line) between Szklarska Poręba and Sosnowiec is approximately 162 miles respectively 260 kilometers.
By car or train, the actual journey to Sosnowiec is certainly longer, as only the direct route (as the crow flies) between Szklarska Poręba and Sosnowiec has been calculated here.
Air line (approximately)
260 kilometers
140 nautical miles