The calculated distance (air line) between Katwijk aan den Rijn and Almere Stad is approximately 36 miles respectively 57 kilometers.
By car or train, the actual journey to Almere Stad is certainly longer, as only the direct route (as the crow flies) between Katwijk aan den Rijn and Almere Stad has been calculated here.
Air line (approximately)
57 kilometers
31 nautical miles