The calculated distance (air line) between Czerwionka-Leszczyny and Gliwice is approximately 10 miles respectively 16 kilometers.
By car or train, the actual journey to Gliwice is certainly longer, as only the direct route (as the crow flies) between Czerwionka-Leszczyny and Gliwice has been calculated here.
Air line (approximately)
16 kilometers
9 nautical miles