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Dec. 11 (Bloomberg) -- U.S. spending online for the holiday season has climbed 15 percent to $24.6 billion from the year- earlier period, ComScore Inc. said.

E-commerce sales have topped $1 billion six separate days, ComScore said today in a statement. Last week’s sales were $5.9 billion, up 15 percent from the year-earlier period.

This year’s holiday season has been helped by a 22 percent gain on Cyber Monday to $1.25 billion, and a 16 percent increase in sales during the Thanksgiving weekend to $1.03 billion, ComScore said.

The data measured the 39-day period from Nov. 1 to Dec. 9.

ComScore, based in Reston, Virginia, compiles Internet traffic data from about 2 million consumers in 170 countries, according to its own website.

--Editors: Sylvia Wier, Patrick McKiernan

To contact the reporter on this story: Dan Hart in Washington at dahart@bloomberg.net

To contact the editor responsible for this story: Sylvia Wier at swier@bloomberg.net