The calculated distance (air line) between Châlette-sur-Loing and Le Havre is approximately 157 miles respectively 253 kilometers.
By car or train, the actual journey to Le Havre is certainly longer, as only the direct route (as the crow flies) between Châlette-sur-Loing and Le Havre has been calculated here.
Air line (approximately)
253 kilometers
137 nautical miles