The chain says the deal is valid at participating restaurants only, so be sure to call ahead.
Habit Burger Grill: Through Sept. 30, make a donation to No Kid Hungry and get a certificate for a free Charburger with cheese to redeem on a future visit through October 2.
See, there are so many National Cheeseburger Day deals for you to get your hands on.
Fatburger: If you're in Los Angeles, get free delivery from one of the 35 Fatburger restaurants in the area with Postmates.
Buy a beverage and get a Gourmet Cheeseburger & Bottomless Steak Fries for $5.
Anyone already ordering a cheeseburger at BurgerFi on September 18 can order an additional burger for just $1, but they must "mention or show offer to redeem".
Tilted Kilt: $10 Cheeseburger, fries, and a Bud Light - September 18th at participating locations only.
Culver's: Although there's not a nationwide promotion, individual locations may offer specials.
BURGER KING Download the chain's app to get a bunch of cheeseburger deals.
All you have to do is purchase a food or drink item with the My McD's app to claim your cheeseburger.
Get a free plate of buttermilk or pumpkin spice pancakes with any IHOP Ultimate Steakburger.
National burger establishments are definitely capitalizing on the day as well. The deal is good all day on September 18 and is for in-store orders only. They are also offering their Carhop Classic Quarter Pound Double Cheeseburger and Medium Tots, or their Classic Sonic Signature Slider and Medium Tots for $2.99 for a limited time. You must download the Wendy's app to redeem the digital coupon for this deal, which you'll find under "Offers". "Because one day of hot and juicy burgers is never enough, Wendy's believes you deserve to celebrate through the end of the month", the chain wrote in a press release. The restaurants are giving away a total of 10,000 free cheeseburgers today, no purchase required.