The calculated distance (air line) between Bonn and Marchienne-au-Pont is approximately 121 miles respectively 194 kilometers.
By car or train, the actual journey to Marchienne-au-Pont is certainly longer, as only the direct route (as the crow flies) between Bonn and Marchienne-au-Pont has been calculated here.
Air line (approximately)
194 kilometers
105 nautical miles