The calculated distance (air line) between Hessisch Oldendorf and Gelsenkirchen is approximately 103 miles respectively 165 kilometers.
By car or train, the actual journey to Gelsenkirchen is certainly longer, as only the direct route (as the crow flies) between Hessisch Oldendorf and Gelsenkirchen has been calculated here.
Air line (approximately)
165 kilometers
89 nautical miles