According to the https://www.cancellation-policy.com/klm-airlines-cancellation-polic... 24 hrs, you can cancel a KLM flight within 24 hours of booking it. If you decide to cancel your ticket within 24 hours, the airline will refund you the full amount paid at no extra charge. This KLM 24-hour free cancellation policy applies to all types of tickets and all domestic and international flights. However, the airline reserves the right to change its 24-hour cancellation policy at any time and without prior notice. Therefore, you should contact us to learn more about the latest KLM policy.
If a KLM airline cancels a free ticket within 24 hours, it allows for free cancellation and a full refund.
Non-refundable ticket: If you have booked non-refundable flights, neither part of the price nor the fees will be refunded.
Refundable: Refundable flight tickets can be canceled without additional charges.
The cancellation fee depends on the type of booking with KLM. Between $ 100 and $ 400 per cancellation fee
If a passenger wishes to cancel their ticket within 24 hours of booking, they can request a refund. The KLM flight was cancelled and passengers were not on alternate flights. Cancellation fees may apply during ticket cancellations. Refunds are available if the Intercontinental KLM flight is delayed for more than 3 hours.