National Coffee Day 2024: How to get free coffee from Dunkin’, Krispy Kreme, Duck Donuts, more
Duck Donuts: Customers can get a free medium hot coffee or cold brew with any purchase on National Coffee Day. The offer is valid in-store and online, but for online orders, you must use the promo code COFFEEDAY24 at checkout. Dunkin’: Dunkin’ Rewards members can get a free medium iced or hot coffee with any purchase on Sunday, Sept. 29.