As millions of Americans prepare for Thanksgiving and Christmas getaways, a new analysis of more than 40,000 flights reveals the travel days that will hit your wallet hardest—and the ones that could save you money .

An analysis by Upgraded Points has compared fares on the 10 busiest domestic routes in early November with prices during the 10-day windows around both Thanksgiving and Christmas.

Across the routes analyzed, the average one-way fare rose from $178 during the control week to $276 during the 10-day Thanksgiving window, revealing a 55 percent increase in travel cost over the holiday season .

The analysis pulled Google Flights fare data for the 10 busiest U.S. domestic routes, comparing a control week in early November with the 10-day windows surrounding Thanksgiving and C

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