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Historical data from Google Flights reveals when airline ticket savings are largest. Markus Mainka / Shutterstock.com
If you want a great deal on a holiday flight, try to buy your ticket about 38 days before a domestic departure. That is when you are most likely to find rock-bottom pricing, according to four years of aggregated Google Flights data. Historically, domestic travelers get the best deals in a window between 21 and 52 days before takeoff, Google says. Prices tend to be lowest for Thanksgiving…