The calculated distance (air line) between Driebergen-Rijsenburg and Dordrecht is approximately 31 miles respectively 50 kilometers.
By car or train, the actual journey to Dordrecht is certainly longer, as only the direct route (as the crow flies) between Driebergen-Rijsenburg and Dordrecht has been calculated here.
Air line (approximately)
50 kilometers
27 nautical miles