The calculated distance (air line) between Nowy Dwór Mazowiecki and Gliwice is approximately 172 miles respectively 276 kilometers.
By car or train, the actual journey to Gliwice is certainly longer, as only the direct route (as the crow flies) between Nowy Dwór Mazowiecki and Gliwice has been calculated here.
Air line (approximately)
276 kilometers
149 nautical miles