The calculated distance (air line) between Déville-lès-Rouen and Saint-Quentin-en-Yvelines is approximately 65 miles respectively 105 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 Déville-lès-Rouen and Saint-Quentin-en-Yvelines has been calculated here.
Air line (approximately)
105 kilometers
57 nautical miles