The calculated distance (air line) between Hessisch Oldendorf and Wiesbaden is approximately 151 miles respectively 243 kilometers.
By car or train, the actual journey to Wiesbaden is certainly longer, as only the direct route (as the crow flies) between Hessisch Oldendorf and Wiesbaden has been calculated here.
Air line (approximately)
243 kilometers
131 nautical miles