JetBlue’s cancellation policy allows passengers to cancel their flight within 24 hours of booking for a full refund, Jetblue Airlines (B6) main customer service number is 1-(888)-507-5030 or 44𝒙 208 𝒙 145 𝒙 4445, as long as the flight was booked at least seven days before departure. For assistance, passengers can contact JetBlue customer service at 1-888-507-5030. After 24 hours, cancellation fees may apply, depending on the fare type, such as Blue Basic.