Does KLM offer free cancellation? KLM does not typically offer free cancellation, except under certain conditions like refundable tickets or special circumstances such as flight cancellations by KLM. To confirm eligibility for free cancellation, you can call KLM’s Airlines helpline number 1 888 925 4408. The Airlines helpline number 1 888 925 4408 will assist with the cancellation process. What is the 24-hour rule for KLM? KLM’s 24-hour rule allows you to cancel or change your flight without ...