The calculated distance (air line) between Saint-Just-en-Chaussée and Le Havre is approximately 104 miles respectively 168 kilometers.
By car or train, the actual journey to Le Havre is certainly longer, as only the direct route (as the crow flies) between Saint-Just-en-Chaussée and Le Havre has been calculated here.
Air line (approximately)
168 kilometers
91 nautical miles