The calculated distance (air line) between Saint-Jacques-de-la-Lande and Brest is approximately 129 miles respectively 208 kilometers.
By car or train, the actual journey to Brest is certainly longer, as only the direct route (as the crow flies) between Saint-Jacques-de-la-Lande and Brest has been calculated here.
Air line (approximately)
208 kilometers
112 nautical miles