Air France’s cancellation fees and charges are dependent on the terms and conditions of the ticket you have booked. The Air France cancellation policy differ based on the ticket type, including Business Class, Basic Economy, Refundable Tickets, and Non-Refundable Tickets.
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Air France Cancellation Policy
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Air France Cancellation Policy

Under Air France cancellation policy, any ticket cancel within 24 hours of booking will be fully refundable an no need to pay extra charges.