As it's a busy time of year, December flight prices tend to go up in the days around Christmas. But if you're flexible with flight and trip duration, and you book well in advance, you can usually bag a brilliant deal.

Generally, December is one of the most expensive months to fly due to the massive demand for holiday travel. The weeks surrounding Christmas and New Year’s Eve are "peak-peak" season, with airlines often doubling or tripling their standard fares. However, there is a "travel hack" window: the first two weeks of December (roughly Dec 1st to Dec 14th) are often surprisingly affordable. During this "dead zone" between Thanksgiving and the winter holidays, airlines often drop prices to fill seats before the holiday rush begins. If you must fly during the holidays, the cheapest days to actually travel are often Christmas Day itself or mid-week days like Tuesdays and Wednesdays. For 2026, experts suggest that while overall travel budgets are rising, those who book 4–6 months in advance or remain flexible with "budget-friendly" destinations (like parts of Eastern Europe or Central America) can still find deals even in the traditionally pricey month of December.