The Merging of two Delta SkyMiles accounts is a non-reversible transaction once confirmed by the user and can only be done between accounts that are for the same person.

Yes, Delta Air Lines allows you to merge duplicate SkyMiles accounts, provided both accounts belong to the same person and have matching personal details such as full name and date of birth. To initiate the process in 2026, you can log in to your primary account on the Delta website and navigate to the "Merge Duplicate Accounts" page under the "Manage My Account" section. You will need to enter the secondary account number and password to validate the request. Once processed, all accumulated miles and any progress toward Medallion Status (MQDs) from both accounts will be consolidated into your primary account. It typically takes up to seven days for the merge to reflect in your profile. It is important to note that you cannot merge accounts belonging to different people (such as a spouse or child); in those cases, you would have to "transfer" miles, which incurs a fee of $0.01 per mile plus a processing charge, making a merge of personal duplicates the much more cost-effective "clean up" option.