The calculated distance (air line) between Téteghem and Saint-Quentin-en-Yvelines is approximately 156 miles respectively 252 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 Téteghem and Saint-Quentin-en-Yvelines has been calculated here.
Air line (approximately)
252 kilometers
136 nautical miles