Great Deals to Celebrate , National Cheeseburger Day.br September 18 is National Cheeseburger Day. To mark the occasion, some of the nation's top burger chains are celebrating with special deals, 'Today' reports.br Here are some of the delicious deals:.br All three of the burgers at Applebee's, the Classic br Cheeseburger, Classic Burger and Classic Bacon br Cheeseburger will be available at a reduced price of $8.99.br All three of the burgers at Applebee's, the Classic br Cheeseburger, Classic Burger and Classic Bacon br Cheeseburger will be available at a reduced price of $8.99.br Burger King is celebrating with a whole week of br special offers, including a free cheeseburger for br Royal Perks members with any purchase over $1.br Burger King is celebrating with a whole week of br special offers, including a free cheeseburger for br Royal Perks members with any purchase over $1.br At Carl's Jr., My Rewards members can br get half off Double Cheeseburgers if they br order online or use the Carl's Jr. app. .br At Carl's Jr., My Rewards members can br get half off Double Cheeseburgers if they br order online or use the Carl's Jr. app. .br At Dairy Queen, any order through br the app of $1 or more comes with a br free single Original Cheeseburger.br At Dairy Queen, any order through br the app of $1 or more comes with a br free single Original Cheeseburger.br Customers ordering through the br McDonald's app can get a Double br Cheeseburger for just 50 cents.br Customers ordering through the br McDonald's app can get a Double br Cheeseburger for just 50 cents.br Instead of a deal to celebrate National Cheeseburger br Day, Sonic is launching a brand new burger: br the Bacon Peppercorn Ranch Grilled Cheese Burger. .br Instead of a deal to celebrate National Cheeseburger br Day, Sonic is launching a brand new burger: br the Bacon Peppercorn Ranch Grilled Cheese Burger. .br At Wahlburgers, customers can get half off all br the popular chain's burgers, including some of br the brand's signature burgers like the O.F.D.br At Wahlburgers, customers can get half off all br the popular chain's burgers, including some of br the brand's signature burgers like the O.F.D.br Wendy's will be celebrating from September 18 br through 22, with a Jr. Bacon Cheeseburger br for just a penny with any purchase.br Wendy's will be celebrating from September 18 br through 22, with a Jr. Bacon Cheeseburger br for just a penny with any purchase.br White Castle's promotion goes from br September 18 to 20, offering BOGO Single br Cheese Sliders, limited to one per order. .br White Castle's promotion goes from br September 18 to 20, offering BOGO Single br Cheese Sliders, limited to one per order.