The calculated distance (air line) between Oberhausen-Rheinhausen and Düsseldorf is approximately 154 miles respectively 248 kilometers.
By car or train, the actual journey to Düsseldorf is certainly longer, as only the direct route (as the crow flies) between Oberhausen-Rheinhausen and Düsseldorf has been calculated here.
Air line (approximately)
248 kilometers
134 nautical miles