Data shows that, at least a good part of the time, booking airfare on Sunday is cheaper than other days of the week. If you have the option to shop for travel at any time, waiting until Sunday could yield 5 percent to 15 percent in savings.

According to the most recent 2026 air travel data, booking your flights on a Sunday remains one of the best ways to secure lower airfare, often saving travelers between 6% and 17% compared to booking on a Monday or Friday. This trend holds true for both domestic and international travel, as airlines frequently release promotional fares over the weekend to capture the attention of leisure travelers who are planning trips during their downtime. While the "Tuesday at 3:00 AM" myth has largely been debunked by modern dynamic pricing algorithms, Sunday consistently surfaces as the day with the lowest average transaction prices. However, a new trend for 2026 suggests that Fridays have also become highly competitive for international bookings specifically. It is important to distinguish between the booking day and the travel day; while Sunday is great for buying the ticket, it is often the most expensive day to actually fly. For the ultimate savings, data suggests booking on a Sunday for a flight that departs on a Tuesday or Wednesday, which typically offers the lowest per-seat cost and the best chance of avoiding the premium pricing applied to weekend departures.