The calculated distance (air line) between Bydgoszcz and Śródmieście is approximately 140 miles respectively 226 kilometers.
By car or train, the actual journey to Śródmieście is certainly longer, as only the direct route (as the crow flies) between Bydgoszcz and Śródmieście has been calculated here.
Air line (approximately)
226 kilometers
122 nautical miles