Yes, there is a specific day when Delta flights tend to be the cheapest, and that day is usually Tuesday. Airlines, including Delta, typically release new flight deals on Monday evenings or early Tuesday mornings. By Tuesday afternoon, competitors have adjusted their prices, offering a better chance of scoring discounted fares. In addition to booking on Tuesday, flying on less busy days like Tuesday, Wednesday, or Saturday can also help you find the best rates. Remember to book your tickets several weeks in advance for major trips to secure the best price.