The calculated distance (air line) between Dobre Miasto and Bydgoszcz is approximately 115 miles respectively 185 kilometers.
By car or train, the actual journey to Bydgoszcz is certainly longer, as only the direct route (as the crow flies) between Dobre Miasto and Bydgoszcz has been calculated here.
Air line (approximately)
185 kilometers
100 nautical miles