The calculated distance (air line) between Saint-Quentin-en-Yvelines and Pantin is approximately 20 miles respectively 32 kilometers.
By car or train, the actual journey to Pantin is certainly longer, as only the direct route (as the crow flies) between Saint-Quentin-en-Yvelines and Pantin has been calculated here.
Air line (approximately)
32 kilometers
17 nautical miles