Delta Airlines has a flexible cancellation policy, which allows a traveler to easily cancel a flight. However, most airlines offer 24-hour cancellation; for this, you ask for does Delta have a 24-hour cancellation policy? So, yes, Delta has a 24-hour cancellation policy, which will be stated under the points below. Simply read it.

Delta Airlines allows passengers to cancel tickets within 24 hours of booking, and the airline doesn't charge for this.

In addition, cancellation within 24 hours of departure of the time will be allowed, but Delta charges for making flight cancellations. 

As per the policy, a traveler can obtain a full refund if the ticket can be revoked within 24 hours of reservation, while if the ticket can be canceled within 24 hours after the flight, the traveler can acquire a partial refund.

Cancellation of the Delta flight after 24 hours of booking by paying some charges.

After acquiring the information on Delta Airlines cancellation policy, continue to cancel the itinerary, which you can do by using its official website's manage booking section or by calling the Delta Airlines customer service person at +1-802-538-7011 (OTA) || 1 (800) 221-1212 and requesting to cancel the ticket and after payment, get confirmation on registered device.