If you cancel a Delta SkyMiles award flight in 2026, the outcome depends on your ticket type, but generally, the miles are redeposited into your account and the taxes/fees are refunded. For "Main Cabin" and above tickets originating in the U.S. or Canada, Delta has eliminated most redeposit fees, meaning you get a full mileage refund as long as you cancel before departure. However, a supportive peer warning: if you booked a Basic Economy (Award) ticket, you will likely be charged a cancellation fee (often 9,900 miles or more), which is deducted from your refund. In 2026, the miles usually reappear in your account almost instantly, and the cash portion (taxes) is returned to your original form of payment within a few business days. Just ensure you hit "cancel" at least 10 minutes before the scheduled departure to avoid "no-show" forfeiture of the entire value.