The calculated distance (air line) between Hoheluft-Ost and Dortmund is approximately 178 miles respectively 286 kilometers.
By car or train, the actual journey to Dortmund is certainly longer, as only the direct route (as the crow flies) between Hoheluft-Ost and Dortmund has been calculated here.
Air line (approximately)
286 kilometers
154 nautical miles