Are you wondering if it costs anything to change a KLM flight? In case of change in plans or postponement, KLM Airlines has made it quite easy for its travelers to cancel or change their flights. Any changes made within 24 hours of booking are absolutely free and can be done via the website as well as over-call with the customer helpline executives. KLM flight change fee is however applied on the tickets changed beyond the time span of 24 hours. It includes the flight change fee in addition to that is the price difference that the travel will have to bear if there is any.