December is statistically one of the most expensive months to fly in 2026, but the pricing is highly polarized. The weeks surrounding Christmas and New Year’s Eve (typically December 18th through January 3rd) see some of the highest airfares of the entire year due to peak holiday demand. However, the first two weeks of December are often a "dead zone" for travel, where you can find significant deals as the industry experiences a lull between the Thanksgiving and Christmas rushes. If you can fly between December 1st and December 12th, you will likely save 30% to 50% compared to late-month prices. For the holiday peak, experts recommend booking at least 3 to 6 months in advance. In 2026, dynamic pricing algorithms are more aggressive than ever, so avoid booking on weekends; statistical data suggests that mid-week flights in December remain the only way to mitigate the "holiday surcharge."