The best day to buy Delta tickets often depends on demand and seasonal sales. Historically, Tuesday and Wednesday have been considered optimal for finding lower fares, but Delta’s dynamic pricing means deals can appear any day. Using the “Best Fare Calendar” on Delta’s website helps travelers compare options across dates. Booking 6–8 weeks in advance for domestic flights and 3–4 months for international trips usually yields better prices. For updates on active sales or recommendations tailored to your route, contact Delta customer service at 877-297-0699 for personalized booking advice.