The calculated distance (air line) between Sèvres and Boulogne-Billancourt is approximately 1 miles respectively 2 kilometers.
By car or train, the actual journey to Boulogne-Billancourt is certainly longer, as only the direct route (as the crow flies) between Sèvres and Boulogne-Billancourt has been calculated here.
Air line (approximately)
2 kilometers
1 nautical miles