The calculated distance (air line) between Bonn and Saint-Dié-des-Vosges is approximately 169 miles respectively 273 kilometers.
By car or train, the actual journey to Saint-Dié-des-Vosges is certainly longer, as only the direct route (as the crow flies) between Bonn and Saint-Dié-des-Vosges has been calculated here.
Air line (approximately)
273 kilometers
147 nautical miles