The calculated distance (air line) between Szczawno-Zdrój and Gliwice is approximately 112 miles respectively 180 kilometers.
By car or train, the actual journey to Gliwice is certainly longer, as only the direct route (as the crow flies) between Szczawno-Zdrój and Gliwice has been calculated here.
Air line (approximately)
180 kilometers
97 nautical miles