The calculated distance (air line) between Bielefeld and Bitterfeld-Wolfen is approximately 164 miles respectively 264 kilometers.
By car or train, the actual journey to Bitterfeld-Wolfen is certainly longer, as only the direct route (as the crow flies) between Bielefeld and Bitterfeld-Wolfen has been calculated here.
Air line (approximately)
264 kilometers
143 nautical miles