The calculated distance (air line) between Piotrków Kujawski and Bielany is approximately 104 miles respectively 168 kilometers.
By car or train, the actual journey to Bielany is certainly longer, as only the direct route (as the crow flies) between Piotrków Kujawski and Bielany has been calculated here.
Air line (approximately)
168 kilometers
90 nautical miles