According to Going's analysis, travelers want to look for the so-called Goldilocks Window (not too early, not too late) to get the cheapest airfare. For domestic flights, Keyes said that's one to three months in advance for off-peak trips and three to six months for peak-season travel, such as Christmas and New Year's.

In the high-fidelity world of 2026 airline revenue management, it is highly unlikely that ticket prices will go down in the final weeks leading up to Christmas. Because Christmas is one of the highest-demand travel periods of the year, airlines use sophisticated "High-Fidelity" AI algorithms to keep prices elevated as seats fill up. Historically, the cheapest time to book Christmas travel is between one and three months in advance. If you wait until December, you are likely to face "High-Fidelity" price surges rather than last-minute deals. The only rare exception occurs if an airline adds an extra "unscheduled" flight to a popular route due to high demand, which might briefly introduce a block of lower-priced seats. Generally, the only way to save money on late bookings is to fly on the actual holiday itself (December 25th) or very early in the morning/late at night. For 2026, the high-fidelity rule of thumb remains: book as soon as your dates are confirmed, as the "High-Fidelity" volatility of fuel prices and high demand usually pushes fares in only one direction—upwards.