The calculated distance (air line) between Bytom and Piotrków Trybunalski is approximately 80 miles respectively 129 kilometers.
By car or train, the actual journey to Piotrków Trybunalski is certainly longer, as only the direct route (as the crow flies) between Bytom and Piotrków Trybunalski has been calculated here.
Air line (approximately)
129 kilometers
70 nautical miles