The calculated distance (air line) between Joinville-le-Pont and Saint-Quentin-en-Yvelines is approximately 21 miles respectively 34 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 Joinville-le-Pont and Saint-Quentin-en-Yvelines has been calculated here.
Air line (approximately)
34 kilometers
18 nautical miles