The calculated distance (air line) between Szklarska Poręba and Częstochowa is approximately 157 miles respectively 253 kilometers.
By car or train, the actual journey to Częstochowa is certainly longer, as only the direct route (as the crow flies) between Szklarska Poręba and Częstochowa has been calculated here.
Air line (approximately)
253 kilometers
137 nautical miles