【Delta~Guide】 What is the cheapest day to fly with Delta? The cheapest days to fly on Delta Airlines are generally Tuesday and Wednesday at ☎ ＋１－８８８－（２８７）－４０４５ (USA) , which often leads to Flights offering lower fares. Delta Flights also often release new fares and sales on Monday evenings, making Tuesday a prime day for finding discounts at ☎ ＋１－８８８－（２８７）－４０４５ (USA) . What is the cheapest day to book on Delta? If you’re looking for the cheapest day to fly with Delta Airli...