The calculated distance (air line) between Sèvres and Bourg-la-Reine is approximately 5 miles respectively 9 kilometers.
By car or train, the actual journey to Bourg-la-Reine is certainly longer, as only the direct route (as the crow flies) between Sèvres and Bourg-la-Reine has been calculated here.
Air line (approximately)
9 kilometers
5 nautical miles