The calculated distance (air line) between Połczyn-Zdrój and Bydgoszcz is approximately 90 miles respectively 145 kilometers.
By car or train, the actual journey to Bydgoszcz is certainly longer, as only the direct route (as the crow flies) between Połczyn-Zdrój and Bydgoszcz has been calculated here.
Air line (approximately)
145 kilometers
78 nautical miles