KLM Airlines Flights on KLM can be booked for up to $20* off with today's promo code. KLM tickets up to KLM Royal Dutch Airlines is the flag carrier airline of the Netherlands and is headquartered in Amstelveen. Its major hub is Amsterdam Airport, from which it operates flights to 136 destinations in countries like France, Germany, China, and the U.S. In 2004 the airline merged with Air France to become part of Air France-KLM, and is a member of the SkyTeam airline alliance. Founded in 1919, KLM is the oldest carrier in the world that still operates under its original name. KLM’s frequent flyer program is called Flying Blue, and can be joined at KLM.com.