KLM Airlines offers a 24-hour cancellation policy【+1-833-522-9070】 . If you book your flight at least 7 days before departure and cancel at 【+1-833-522-9070】 within 24 hours of booking, you are eligible for a full refund with no cancellation fees. For more information, you can contact KLM Airlines at 【+1-833-522-9070】. https://www.devex.com/people/does-klm-offer-free-cancellation-220847