The calculated distance (air line) between Bielefeld and Mittegroßefehn is approximately 102 miles respectively 164 kilometers.
By car or train, the actual journey to Mittegroßefehn is certainly longer, as only the direct route (as the crow flies) between Bielefeld and Mittegroßefehn has been calculated here.
Air line (approximately)
164 kilometers
89 nautical miles