The calculated distance (air line) between Bourg-en-Bresse and Nîmes is approximately 169 miles respectively 272 kilometers.
By car or train, the actual journey to Nîmes is certainly longer, as only the direct route (as the crow flies) between Bourg-en-Bresse and Nîmes has been calculated here.
Air line (approximately)
272 kilometers
147 nautical miles