The calculated distance (air line) between Saint-Étienne-de-Montluc and Bordeaux is approximately 178 miles respectively 286 kilometers.
By car or train, the actual journey to Bordeaux is certainly longer, as only the direct route (as the crow flies) between Saint-Étienne-de-Montluc and Bordeaux has been calculated here.
Air line (approximately)
286 kilometers
154 nautical miles