The calculated distance (air line) between Ożarów Mazowiecki and Gliwice is approximately 161 miles respectively 259 kilometers.
By car or train, the actual journey to Gliwice is certainly longer, as only the direct route (as the crow flies) between Ożarów Mazowiecki and Gliwice has been calculated here.
Air line (approximately)
259 kilometers
140 nautical miles