Burger King: Free cheeseburger with purchase
National Cheeseburger Day is a three-day occasion at Burger King. Starting Friday and through Sunday, get a free cheeseburger with a $1 or more purchase and an offer on the BK app.
The chain also has launched a new nationwide loyalty program and limited-time celebrity meals.
Wendy's: BOGO cheeseburger
Through Sunday, Wendy's has a buy-one-get-one free premium cheeseburger deal on its app, which includes the new Big Bacon Cheddar Cheeseburger.
Also, through Oct. 3, get $2 off premium combos with a separate app deal. There's a limit of one offer per customer per visit.
Wendy's has also brought back its "Boo! Books" ahead of Halloween. Through Oct. 31, get the books for $1, which include five coupons for free Jr. Frosty treats that are popular to give out for trick-or-treating. The Frosty coupons can be redeemed through Dec. 31.
McDonald's: 50-cent double cheeseburger
McDonald's is offering double cheeseburgers for 50 cents with a mobile app deal Saturday.
With the fast-food giant's app and new MyMcDonald's Rewards, you'll also earn a freebie after you make your first purchase now through Dec. 31.
After your first purchase, you'll automatically get 1,500 points, which is enough points to get a free item in the first tier on your next order and choice of an order of hash browns, vanilla cone, a McChicken or a free cheeseburger.
There are other deals on the McDonald's app. On Fridays through Jan. 2, get free medium fries with a minimum $1 purchase. Also, for a limited time, McDonald's Happy Meals have Disney toys inside in celebration of Walt Disney World's 50th anniversary.
Applebee's: $9.99 burger deal
For National Cheeseburger Day, Applebee's has a takeout and delivery deal. Get any handcrafted burger, fries and a 30-ounce soft drink for $9.99 Saturday.
One of the soda options is the new "MTN DEW Dark Berry Bash," which is exclusive to Applebee's and is a mix of blue raspberry and blackberry flavors with Mountain Dew's signature citrus blend.
Sonic Drive-In: Half-off Grilled Cheese Burger
Through Oct. 31, Sonic Drive-In has a deal on its app with half off its Grilled Cheese Burger, which the chain describes as "like a burger with a side of grilled cheese."
The app deal can only be used one time per account. Also every Tuesday after 5 p.m., Sonic has half-priced cheeseburgers when you order on the app or online. Drinks and slushes also are 50% off daily when ordered on the app in the "Happy Hour Any Time" offer.
The chain is holding an Instagram contest and giving away free A+ Meals for a year to one winner, who will be selected at random. To enter follow @burgerfi, like the photo posted Saturday and tag three friends in the comments. If you share on your stories, BurgerFi says you'll get extra entries. The contest ends Sept. 24, and you need to be 18 or older and a resident of the U.S. Learn more at Burgerfi.com/sweeps.
If you're signed up for the chain's email list, get a Big Carl small combo for $6.29 Saturday. Sign up for future offers at Carlsjr.com/email-signup.
Get the chain's signature cheeseburger for $5 in-store for dine-in or takeout Saturday. Other Haus Burgers do not apply to this offer and there's a limit of one per person.
Sweet Rewards Club members get a free medium sundae with the purchase of any cheeseburger. Join the club by downloading the Friendly's app or on the restaurant's website.
The Habit Burger Grill
On Friday and Saturday, get a free Charburger with Cheese when you place a $20 or more order through UberEats.
If you're signed up for the chain's email list, get a Western Bacon Cheeseburger small combo for $4.99 Saturday. Sign up for future offers at Hardees.com/email-signup.
The chain has a Cheesy Yumburger Snack Pack deal Saturday, which includes four Cheesy Yumburgers, and costs $10 to $12 depending on location.
New and existing rewards members can get any burger for $5 with a $5 minimum purchase on the chain's rewards app Friday through Sunday.
Get a $6 signature Pub Classic burger and fries Saturday.
Existing members of the chain's "royalty program" get a buy-one-get-one cheeseburger 50% off through Sunday. To get this deal members had to have joined before Sept. 13.
Get a $5 Double Classic Burger on Saturday.
Get a buy-one-get-one free deal on classic burgers when you order through the chain's app Saturday.
With a coupon, get a BOGO deal on double cheese sliders Saturday.