The calculated distance (air line) between Douvres-la-Délivrande and Saint-Quentin-en-Yvelines is approximately 115 miles respectively 184 kilometers.
By car or train, the actual journey to Saint-Quentin-en-Yvelines is certainly longer, as only the direct route (as the crow flies) between Douvres-la-Délivrande and Saint-Quentin-en-Yvelines has been calculated here.
Air line (approximately)
184 kilometers
99 nautical miles