The calculated distance (air line) between Saint-Cyr-sur-Loire and Le Havre is approximately 147 miles respectively 236 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-Cyr-sur-Loire and Le Havre has been calculated here.
Air line (approximately)
236 kilometers
128 nautical miles