The calculated distance (air line) between Mīāndoāb and Oshnavīyeh is approximately 56 miles respectively 90 kilometers.
By car or train, the actual journey to Oshnavīyeh is certainly longer, as only the direct route (as the crow flies) between Mīāndoāb and Oshnavīyeh has been calculated here.
Air line (approximately)
90 kilometers
49 nautical miles