JetBlue Airlines' cancellation policy. Canceling a flight at an odd hour may seem like a bad idea, so it is recommended to be aware of the rules and regulations of JetBlue Airlines' cancellation policy. According to the cancellation policy, one can cancel one's ticket at least 24 hours and seven days before departure. In most cases, the passengers can initiate the refund procedure, but only if they have followed the cancellation rules. However, Blue Basic Fare ticket-holders cannot change their tickets, let alone request a refund. Alas, if you plan to revoke your reservation, you must check out the rules and regulations of the JetBlue cancellation policy and then proceed with the procedure.