What is the cheapest day to buy Delta tickets? [(Delta Airlines Fare Guide))] What is the cheapest day to fly Delta Airlines? ​When planning to fly with Delta Airlines, the most cost-effective days 𝟷-𝟾𝟺𝟺-𝟽𝟾𝟶-𝟷𝟺𝟻𝟶 // 𝟷-𝟾𝟾𝟾-𝟾𝟶𝟸-𝟿𝟾𝟹9 typically Tuesdays, Wednesdays, and Saturdays.