The calculated distance (air line) between Le Havre and Boulogne-Billancourt is approximately 107 miles respectively 172 kilometers.
By car or train, the actual journey to Boulogne-Billancourt is certainly longer, as only the direct route (as the crow flies) between Le Havre and Boulogne-Billancourt has been calculated here.
Air line (approximately)
172 kilometers
93 nautical miles