The calculated distance (air line) between Saintry-sur-Seine and Saint-Quentin-en-Yvelines is approximately 25 miles respectively 40 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 Saintry-sur-Seine and Saint-Quentin-en-Yvelines has been calculated here.
Air line (approximately)
40 kilometers
22 nautical miles