The calculated distance (air line) between Bochum-Hordel and Vlaardingen is approximately 125 miles respectively 201 kilometers.
By car or train, the actual journey to Vlaardingen is certainly longer, as only the direct route (as the crow flies) between Bochum-Hordel and Vlaardingen has been calculated here.
Air line (approximately)
201 kilometers
108 nautical miles