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Google Flights Travel Trends and Insights
James Byers, on Google:
International flights: If you’re traveling abroad, you should probably book as early as you can. While average prices have been lowest 101 days before departure, the historical low price range is anytime 50 days or more before takeoff. In other words, for international travel from the U.S., average prices don’t meaningfully drop anytime before departure, but they usually do start to rise within 50 days of the flight itself.
I’m a big user for Google Flights for prices tracking and deciding routes. Great post if you’re tracking multiple flights for the upcoming holidays.