{{Delta Airlines}} How late can you cancel a Refundable Delta Airlines Flight? - CALL NOW. +1:😱:804|:251~8886 ka cancellation policy allows passengers to cancel their flights within 24 hours of booking for a full refund, provided the flight is booked at least seven days before departure. Absolutely, Delta Airlines provides a 24-hour cancellation policy. If you need to cancel your flight, you can do so without a fee within 24 hours after your booking.