The calculated distance (air line) between Saint-Quentin-en-Yvelines and Rueil-Malmaison is approximately 11 miles respectively 17 kilometers.
By car or train, the actual journey to Rueil-Malmaison is certainly longer, as only the direct route (as the crow flies) between Saint-Quentin-en-Yvelines and Rueil-Malmaison has been calculated here.
Air line (approximately)
17 kilometers
9 nautical miles