The calculated distance (air line) between Piotrków Kujawski and Gdynia is approximately 136 miles respectively 219 kilometers.
By car or train, the actual journey to Gdynia is certainly longer, as only the direct route (as the crow flies) between Piotrków Kujawski and Gdynia has been calculated here.
Air line (approximately)
219 kilometers
118 nautical miles