The calculated distance (air line) between Oer-Erkenschwick and Wiesbaden is approximately 116 miles respectively 187 kilometers.
By car or train, the actual journey to Wiesbaden is certainly longer, as only the direct route (as the crow flies) between Oer-Erkenschwick and Wiesbaden has been calculated here.
Air line (approximately)
187 kilometers
101 nautical miles