https://www.dairyqueen.com/en-us/menu/original-cheeseburger-signature-stackburger/?size=single Diary Queen Rewards Members National Cheeseburger Day and offering their DQ Single Original Cheeseburger Signature Stackburger w/ Any Purchase of $1+ when you login to your account and apply your rewards offer at any partipcating locations through September 18, 2026.