JACKSONVILLE, Fla. Mondays call for coffee... FREE coffee! Dunkin announced they are bringing back a fan favorite -- Free Donut Fridays! They are also starting Free Coffee Mondays! Starting Monday, August 3, if youre a Dunkin Perks Member, you can get a free medium coffee, hot or iced, for free! RELATED | Dunkin is permanently closing about 800 locations across the countryDuring Free Donut Fridays, members get a free classic donut with any drink purchase.