The calculated distance (air line) between Warsaw and Piotrków Trybunalski is approximately 80 miles respectively 128 kilometers.
By car or train, the actual journey to Piotrków Trybunalski is certainly longer, as only the direct route (as the crow flies) between Warsaw and Piotrków Trybunalski has been calculated here.
Air line (approximately)
128 kilometers
69 nautical miles