The calculated distance (air line) between Saint-Lô and Paris 15 Vaugirard is approximately 155 miles respectively 249 kilometers.
By car or train, the actual journey to Paris 15 Vaugirard is certainly longer, as only the direct route (as the crow flies) between Saint-Lô and Paris 15 Vaugirard has been calculated here.
Air line (approximately)
249 kilometers
135 nautical miles