The calculated distance (air line) between Piotrków Kujawski and Gdańsk is approximately 125 miles respectively 201 kilometers.
By car or train, the actual journey to Gdańsk is certainly longer, as only the direct route (as the crow flies) between Piotrków Kujawski and Gdańsk has been calculated here.
Air line (approximately)
201 kilometers
108 nautical miles