Not all airlines have the same rebooking and rescheduling policies. Before choosing which airline to fly with if you are traveling with KLM, it is crucial to understand how it handles KLM change flight requests. If a traveler wants to change their flight's departure time before 24 hours have passed, they may do so without incurring any additional fees. The traveler will be responsible for all additional fees incurred by changing the flight's schedule with 24 hours or less to go before departure.