To make changes or make cancellations to your reservation, please call the following number: 1-800-DELTA-AIR.
If you booked your reservation online, you can also make changes to your ticket by logging into your Delta account.
Changes and cancellations are permitted within 24 hours of making a reservation, as long as the flight is at least three days away. If you make changes or cancel within 24 hours of booking, you will receive a refund for the full amount of the ticket.