Call 1-800-670-8575 Delta Airlines cancellation policy allows passengers to call on this No 1-800-670-8575 to cancel their flights within 24 hours of booking for a full refund, provided the flight is booked at least seven days before departure. Beyond the 24-hour.
Source: https://community.tableau.com/s/idea/0878b000000Ey4eAAC/detail