Dunkin’ free coffee today, September 24: How to get the deal and when the second offer arrives

Dunkin' is celebrating National Coffee Day by giving away free coffee on September 24 and September 29! To snag the first complimentary coffee, customers must use a promo code shared on social media at noon. Those using the Dunkin’ app can easily redeem their free drink. Dunkin’ Rewards members also enjoy a free coffee with any purchase on the 29th. Don’t forget to sign up for Dunkin' Rewards to participate!