The calculated distance (air line) between Bonn and Vendin-le-Vieil is approximately 186 miles respectively 300 kilometers.
By car or train, the actual journey to Vendin-le-Vieil is certainly longer, as only the direct route (as the crow flies) between Bonn and Vendin-le-Vieil has been calculated here.
Air line (approximately)
300 kilometers
162 nautical miles