The calculated distance (air line) between Saint-Quentin-en-Yvelines and Les Essarts-le-Roi is approximately 7 miles respectively 11 kilometers.
By car or train, the actual journey to Les Essarts-le-Roi is certainly longer, as only the direct route (as the crow flies) between Saint-Quentin-en-Yvelines and Les Essarts-le-Roi has been calculated here.
Air line (approximately)
11 kilometers
6 nautical miles