The calculated distance (air line) between Gliwice and Siemianowice Śląskie is approximately 16 miles respectively 25 kilometers.
By car or train, the actual journey to Siemianowice Śląskie is certainly longer, as only the direct route (as the crow flies) between Gliwice and Siemianowice Śląskie has been calculated here.
Air line (approximately)
25 kilometers
14 nautical miles