If you've already joined, then you can go on ahead and get your free cheeseburger.
Lots of restaurants are offering deals to celebrate.
Ruby Tuesday: Purchase an entrée between September 18 and 19, and receive a free Ruby Tuesday Cheeseburger.
According to a survey by Offers.com, 25 percent of consumers chose Five Guys as their favorite cheeseburger, 21 percent of consumers chose Wendy's and 20 percent McDonald's. BurgerFi is offering a buy one BurgerFi Cheeseburger get one for only $1 on National Cheeseburger Day.
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Tilted Kilt: $10 Cheeseburger, fries, and a Bud Light - September 18th at participating locations only.
Also, unlike previous year, you no-longer have to purchase other products to claim your burger.
Ted's Montana Grill: Get a cheeseburger and fries for $6 when you dine in.
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Get a free plate of buttermilk or pumpkin spice pancakes with any IHOP Ultimate Steakburger. They're giving away a free cheese slider with any purchase. Also, for a limited time, get a Carhop Classic, which is the choice of the Quarter Pound Double Cheeseburger or the Classic Signature Slinger, served with medium tots for only $2.99.
National burger establishments are definitely capitalizing on the day as well.
National Cheeseburger Day 2018 falls on a Tuesday, which is convenient - because every Tuesday Sonic offers half-price cheeseburgers from 5 p.m. until closing. You must download the Wendy's app to redeem the digital coupon for this deal, which you'll find under "Offers". One offer per customer per day.
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