If you are looking to find out how much does KLM charge to change flight, then their guidelines will help you. KLM operates worldwide with branded flights on a dozen of destinations across Europe and Asia. The cost for changing a flight varies depending on the time left before departure, as well as upgrade class and routing. A customer pays more money if they request for an earlier flight because there will be additional costs like ticket fares and other charges that come with it such as baggage fees and meals. Supersessions are charged to passengers that request an earlier departure time than the scheduled departure of their flight.