Early this month, the average price for a domestic flight around Thanksgiving was down about 9 percent from a year ago. And flights around Christmas were about 18 percent cheaper, according to Hopper, a booking and price-tracking app. Kayak, the travel search engine, looked at a wider range of dates around the holidays and found that domestic flight prices were down about 18 percent around Thanksgiving and 23 percent around Christmas. "In a lot of cases, we're seeing some of the lowest fares that we've seen really since travel started coming back after the drop-off in 2020," said Kyle Potter, executive editor of Thrifty Traveler, a travel blog and deal-watching service. Domestic ticket prices fell over the summer, Mr. Potter said, and deals on international travel, particularly to Europe, have become more common recently.