The calculated distance (air line) between Saint-Quentin-en-Yvelines and Sarcelles is approximately 23 miles respectively 36 kilometers.
By car or train, the actual journey to Sarcelles is certainly longer, as only the direct route (as the crow flies) between Saint-Quentin-en-Yvelines and Sarcelles has been calculated here.
Air line (approximately)
36 kilometers
20 nautical miles