If you have a booking with JetBlue flight and your travel plans has changed with the airlines then JetBlue always offers the privilege to cancel the flight via JetBlue Cancellation Policy. If JetBlue cancels your flight, then the airlines offer you 100% of the cancellation amount to the source account. All of the cancellations made within 24 hours of booking are liable to get 100% of the refund amount into the source account. All of the cancellation made within 4 hours of departure will not get any refund even if they wish to cancel the flight ticket.