Question: how to go from amsterdam airport to leiden?
Answer: Dutch Railways (NS) operates a train from Schiphol Airport to Leiden Centraal every 20 minutes. Tickets cost 7€ - 16€ and the journey takes 16 min. Alternatively, Arriva NL operates a bus from Schiphol, Airport to Leiden, Kooiplein hourly. Tickets cost 5€ - 6€ and the journey takes 40 min.