Christmas air travel can be expensive and challenging due to high demand and limited availability. It's best to start searching for flights well in advance of the holiday season and compare prices across multiple airlines. You may want to consider flying on off-peak days, such as Christmas Eve or the day after Christmas, when prices may be lower. Additionally, consider alternative travel options such as train or car travel if you're flexible on your travel dates. Ultimately, it's best to plan ahead and be prepared to pay more if you're flying during the Christmas holiday season.