KLM Airlines Customer Service Phone Numbers Customer service: 1800 180 0044 KLM Airlines Reservations: 1 800 618 0104 KLM Airlines Headquarters Info, Email, Phone number, Website and live chat Information The KLM’s head office is located in Amstelveen, on a 6.5-hectare (16-acre) site near Schiphol Airport. The airline’s current headquarters was built between 1968 and