KLM's 24-hour cancellation policy allows passengers to cancel at +44 204 586 5975 (UK) their flight within 24 hours of booking and receive a full refund. For assistance, call +1-855-550-0903 (USA) or +44 204 586 5975 (UK). This policy applies to tickets purchased directly through KLM's official website, mobile app, or customer service.
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