The calculated distance (air line) between Poznań and Siemianowice Śląskie is approximately 170 miles respectively 273 kilometers.
By car or train, the actual journey to Siemianowice Śląskie is certainly longer, as only the direct route (as the crow flies) between Poznań and Siemianowice Śląskie has been calculated here.
Air line (approximately)
273 kilometers
147 nautical miles