The calculated distance (air line) between Sępólno Krajeńskie and Łódź is approximately 142 miles respectively 228 kilometers.
By car or train, the actual journey to Łódź is certainly longer, as only the direct route (as the crow flies) between Sępólno Krajeńskie and Łódź has been calculated here.
Air line (approximately)
228 kilometers
123 nautical miles