McDonald's: No one sells more cheeseburgers than McDonald's, and on September 18, the restaurant will give out a free cheeseburger with a $1 purchase.
Today is the final day for users to vote on whether they want a traditional Cheeseburger, Double Cheeseburger, or McDouble for free.
On National Cheeseburger Day, Dairy Queen is giving $1 off any Signature Stackburger bought via the app.
Jack in the Box is commemorating National Cheeseburger Day with a $2 Jumbo Jack Cheeseburger with any in-app purchase.
Buy one get one free at Smashburger with discount code BOGO22 in-store and online.
Wayback Burgers will also offer a BOGO bargain on their classic burger on September 18 via their app.