JetBlue follows a 24-hour rule allowing passengers to make changes to their bookings or cancel their flights within 24 hours of purchase without incurring any penalty fees. Passengers can also cancel their JetBlue flights according to the airline's cancellation policy by calling their hotline at 1-800-JETBLUE (538-2583) or 1-844-604-2944 (Quick Connect) Depending on the fare type and timing of the cancellation, passengers may be eligible for a refund or a travel credit for future use.