Big restaurant chains across the country are serving up special deals on National Cheeseburger Day, September 18, 2025. At Burger King, members can get a free bacon cheeseburger with just a $1 purchase. Whataburger throws in free sides with certain burgers. Applebee's offers burgers and fries for $8.99, while Red Robin includes unlimited sides for $9.99. Dairy Queen members get five days of special offers.