Delta has recently made certificates available online, making it very easy to use your upgrade certificate. In the past, you had to contact them by phone (which could lead to long waits). Here’s how online, phone, and Delta app redemptions work:
First, make sure you’re logged into your account so you can see which flights are available for upgrade.
Next, search for your desired flight and check first class availability under time. If a first class upgrade is available, you will see the phrase “First available with upgrade certificate”.
Regional upgrade certificates cannot be used for long-haul international flights. Instead, the message “Delta One Suites available with Global Upgrade Certificate” is displayed.
Once you’ve found the flight you’re looking for, you’ll need to make sure you’re booking the right class. To take advantage of regional upgrades, book at least the Main Cabin as Basic Economy flights do not count.
For Global Upgrade Certificates on international flights, booking Comfort+ will move you to a Premium Select cabin. Upgrade to Delta One when you book in Premium Select.
If your plane isn’t equipped with a Premium Select cabin, like some of the Airbus A350s leased by Delta from Latin America, booking Comfort+ will jump you up to a Delta One cabin.
Just before completing the booking process, you should be given the option to apply your upgrade instantly online.
phone and app
Auto-upgrades are not available when using the app as they are currently only displayed when booking on the website. To use a regional or global upgrade certificate, simply make a reservation as usual, call the Platinum or Diamond Medallion line and ask the caller to upgrade.
The ticket reissue process is a manual process between a Delta representative and the ticketing desk. You may have to wait for a while if you make a call during times of heavy call volume due to bad weather or other events. Try calling first thing in the morning or late at night.