The calculated distance (air line) between Solec Kujawski and Śródmieście is approximately 131 miles respectively 211 kilometers.
By car or train, the actual journey to Śródmieście is certainly longer, as only the direct route (as the crow flies) between Solec Kujawski and Śródmieście has been calculated here.
Air line (approximately)
211 kilometers
114 nautical miles