Costs vary depending on the class of ticket you purchased and the type of seat you want to upgrade to. Seat availability at the time of upgrade may also affect the upgrade price. Upgrade pricing is available in the Delta app, online at Delta.com, or by calling customer service. Delta SkyMiles elite members could receive complimentary upgrades on eligible flights, depending on their status level. Redeeming Global and Regional Upgrade Certificates is another way to receive a complimentary upgrade on an eligible flight. These upgrade certificates are provided to Platinum and Diamond elite members each year. Keep in mind that Basic Economy tickets are not eligible for upgrades.