The calculated distance (air line) between Saint-Quentin-en-Yvelines and Saint-Cyr-l'École is approximately 3 miles respectively 5 kilometers.
By car or train, the actual journey to Saint-Cyr-l'École is certainly longer, as only the direct route (as the crow flies) between Saint-Quentin-en-Yvelines and Saint-Cyr-l'École has been calculated here.
Air line (approximately)
5 kilometers
3 nautical miles