The calculated distance (air line) between Bad Soden-Salmünster and Bielefeld is approximately 127 miles respectively 204 kilometers.
By car or train, the actual journey to Bielefeld is certainly longer, as only the direct route (as the crow flies) between Bad Soden-Salmünster and Bielefeld has been calculated here.
Air line (approximately)
204 kilometers
110 nautical miles