The calculated distance (air line) between Lys-lez-Lannoy and Saint-Quentin-en-Yvelines is approximately 141 miles respectively 228 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 Lys-lez-Lannoy and Saint-Quentin-en-Yvelines has been calculated here.
Air line (approximately)
228 kilometers
123 nautical miles