Are you looking up how to cancel delta flight? The Delta flights can be canceled online as well as by calling the customer care helpline number given on the official website. You become eligible for a complete refund upon cancellation if you’re canceling your flight within 24 hours of reservation. Once your cancellation is done you will get a confirmation email which will let you know whether or not the process was successful. Your refund amount will also be transferred back to you shortly after.