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Cheap Thanksgiving airfare is going to be harder to come by this year than last - 9 percent harder, according to some estimates. That's how much higher airfare over the holiday is this year than last, according to Travelocity.

The average, round-trip domestic fare is $386, roughly equal to what Americans paid to fly over July 4th. But not all cities are created equal. Take a look at the chart below to find out how much the average airfare is from the top 20 origination markets over the holiday. Then, use that number while you're shopping for flights. Travelocity calls it "the price to beat."

The online booking site said you can save up to $288 by being flexible with your travel dates. The cheapest days to fly are Thanksgiving Day, the Friday following, and Tuesday, Nov. 27.