Why is coffee free at Dunkin’ on September 29?
Guests can set their alarms, because no matter how it’s poured – hot or iced – Dunkin’ is serving a free cup to Rewards members as the perfect way to celebrate National Coffee Day on Sept. Doubling Down to Perk Up Your Week: Dunkin’ Introduces Free Coffee Mondays and Brings Back Free Donut Fridays for DD Perks® Members. DD Perks® members can get a free medium hot or iced coffee with a food purchase on Mondays, and free classic donut with a beverage purchase on Fridays, for a limited time.