The average price of a gallon of regular gasoline fell below $2 on Monday for the first time since 2009, AAA reported.
The national average for gas was $1.998 per gallon. gas prices last fell below $2 a gallon between November 2008 and March 2009 during the height of the Great Recession, according to AAA.
Cheaper gas prices has saved Americans more than $115 billion so far this year, AAA said, or more than $550 per driver.
"Drivers across the country are celebrating the historic return of cheaper gas prices," said Marshall Doney, AAA's president and CEO, said in a statement. "The lowest gas prices in nearly seven years are a holiday gift that few consumers could have imagined when gasoline was $4 a gallon."
AAA estimates that more than 91 million Americans plan to drive 50 miles or more during the holiday season.
More than two-thirds of U.S. stations already are selling gas under $2 per gallon, and drivers can find at least one station selling gas for less than that price in 47 states. The most common price nationwide is $1.899 per gallon. The national average price of gas is about 41 cents less than a year ago.
The lowest one percent of U.S. stations are selling gas for an average of $1.59 per gallon, and more than 13,000 stations are selling gas for less than $1.75 per gallon.
The states with the cheapest gas prices include: Missouri ($1.77), Oklahoma ($1.78), South Carolina ($1.78), Tennessee ($1.79), and Kansas ($1.79).
Kansas City, Missouri has the cheapest metro average in the country at $1.68 per gallon.