The calculated distance (air line) between Solec Kujawski and Bydgoszcz is approximately 9 miles respectively 15 kilometers.
By car or train, the actual journey to Bydgoszcz is certainly longer, as only the direct route (as the crow flies) between Solec Kujawski and Bydgoszcz has been calculated here.
Air line (approximately)
15 kilometers
8 nautical miles