The calculated distance (air line) between Bonn and Sainghin-en-Weppes is approximately 184 miles respectively 297 kilometers.
By car or train, the actual journey to Sainghin-en-Weppes is certainly longer, as only the direct route (as the crow flies) between Bonn and Sainghin-en-Weppes has been calculated here.
Air line (approximately)
297 kilometers
160 nautical miles