The calculated distance (air line) between Piotrków Kujawski and Olsztyn is approximately 118 miles respectively 191 kilometers.
By car or train, the actual journey to Olsztyn is certainly longer, as only the direct route (as the crow flies) between Piotrków Kujawski and Olsztyn has been calculated here.
Air line (approximately)
191 kilometers
103 nautical miles