UPDATE 1-U.S. sales continue to slip, ShopperTrak says

* Sales at U.S. retailers fell 0.3 percent last week

* Foot traffic at U.S. retailers down 6.1 in November

CHICAGO, Dec 9 (Reuters) - Sales at U.S. retailers fell 0.3 percent last week and slipped 0.1 percent in November, ShopperTrak said on Wednesday, echoing earlier data that showed consumers have cut back on holiday-season spending.

Foot traffic at U.S. retailers in November fell 6.1 percent, according to ShopperTrak, a private firm that monitors such data.

ShopperTrak expects to see some spending late next week as shoppers head out to grab a particular item while it is still in stock, followed by heavy shopping on Saturday, Dec. 19, and during the week leading into Christmas, Co-founder Bill Martin said in a statement.

Sales in the week ended Dec. 5 fell 0.3 percent from a year earlier and plunged 18 percent from the previous week, which included the busy Friday after Thanksgiving.

While many stores have seen sales slump, U.S. online holiday spending have risen 3 percent so far this holiday season, analytics firm comScore Inc SCOR.O said on Tuesday. For the week ended Dec. 6, comScore said online holiday spending rose 3 percent, to $4.6 billion. [ID:nN08143036] (Reporting by Jessica Wohl; editing by John Wallace)