The calculated distance (air line) between Katwijk aan den Rijn and Hoofddorp is approximately 14 miles respectively 22 kilometers.
By car or train, the actual journey to Hoofddorp is certainly longer, as only the direct route (as the crow flies) between Katwijk aan den Rijn and Hoofddorp has been calculated here.
Air line (approximately)
22 kilometers
12 nautical miles