National Cheeseburger Day on September 18 is being celebrated with numerous deals at fast-food chains across the country. McDonald’s is offering 50-cent double cheeseburgers for app users, while Burger King provides a free cheeseburger with a purchase of $1, along with various other daily deals throughout the week. Wendy's is enticing customers with a Jr. Bacon Cheeseburger for just one cent with any purchase, valid from September 18 to 22. Additionally, Buffalo Wild Wings offers a buy-one-get-one-free burger deal for reward members on the holiday. Whataburger is celebrating by entering Rewards Members who order specific burgers into a sweepstakes for a chance to win free Whataburger for a year. This day not only highlights great deals but also commemorates the cheeseburger's nearly 100-year history since its creation in Pasadena, California.