Posted in Web Burger Day 2021: McDonald’s, Wendy’s, Burger King have … Burger King: For National Burger Day, get a free Whopper with an app offer and a $3 purchase Friday. Find additional deals on the Burger King app. For a limited time, the chain has a buy one, get … https://www.usatoday.com/story/money/food/2021/05/26/burger-day-deals-freebies-mcdonalds-wendys-burger-king/7417336002/