The calculated distance (air line) between Konstancin-Jeziorna and Gliwice is approximately 163 miles respectively 262 kilometers.
By car or train, the actual journey to Gliwice is certainly longer, as only the direct route (as the crow flies) between Konstancin-Jeziorna and Gliwice has been calculated here.
Air line (approximately)
262 kilometers
142 nautical miles