By Lauren Pollock And Michael Calia 

The gift of lower gasoline prices helped U.S. retailers post stronger-than-expected sales over the holiday-shopping season as consumers were more inclined to open their wallets to take advantage of promotions at the mall.

Retailers have been battling steep and persistent drops in store traffic as shoppers make more purchases online. That decline has prompted chains to slow store openings and forced a few apparel retailers to close their doors in recent months.

The stronger holiday sales won't necessarily translate into higher earnings, though, as promotions and other efforts to clear inventory threaten to dent the companies' bottom lines.

Urban Outfitters Inc. Chief Executive Richard Hayne said Thursday that "this year's holiday environment in the fashion apparel industry was more promotional than any I can recall."

Many retailers, including the major department stores and most big-box retailers, stopped reporting monthly metrics some time ago, making it difficult to gain perspective about the entire industry. However, on Thursday, more chains than usual reported their holiday sales, many to tout strong results.

Among the standouts that reported Thursday were Costco Wholesale Corp. and L Brands Inc.

Costco, which sells groceries and other items in bulk, is also one of the largest fuel retailers in the U.S. The company posted an 8% increase in sales, excluding gasoline, in December, topping estimates of 7.1% growth. However, it indicated lower gasoline prices knocked its sales growth in the U.S. by three percentage points.

L Brands posted a stronger-than-expected 4% increase in sales for December, but the operator of Victoria's Secret and Bath & Body Works offered a somewhat cautious outlook for January that sent its shares slightly lower.

Family Dollar Stores Inc., another retailer thought to benefit from low gas prices, said its December sales at existing locations rose 1.2% as customer traffic grew despite fewer markdowns from seasonal promotions. Family Dollar's core customers are typically low-income shoppers who are particularly sensitive to fluctuating prices at the pump.

Auto club AAA has estimated the average U.S. household saved $115 on gasoline last year, mostly in the year's final months as crude oil prices dropped about 50% from their summer highs.

In all, the Thomson Reuters sales index indicated retail sales rose 5.1% in December, excluding newly opened and closed stores. Factoring in Gap Inc., which is expected to report after the market close, Thomson Reuters had projected the 10 retailers it tracks to post 3.8% growth.

Even the long-struggling teen apparel sector reported widespread sales growth.

American Eagle Outfitters Inc. and AĆ©ropostale Inc. boosted their bottom-line guidance for the current quarter, and Urban Outfitters said it posted record sales for the holiday-shopping season, with each of its brands delivering positive comparisons.

Trendy apparel chains Zumiez Inc. and Pacific Sunwear Inc. also outperformed expectations.

The relatively positive news from some teen retailers comes at an otherwise dire time for the sector. Wet Seal Inc. said Wednesday that it would close two-thirds of its stores and lay off 3,695 employees. Catalog retailer Delia's Inc., meanwhile, filed for Chapter 11 protection last month, and Deb Shops has moved to liquidate its merchandise.

Elsewhere, Signet Jewelers Ltd., the operator of Zale, Sterling Jewelers and its namesake locations, said sales rose across all of its divisions over the eight-week holiday period. It pointed to its merchandise assortment and resistance to deep promotions.

But long-struggling Barnes & Noble Inc. said Nook sales plunged 55% in the holiday season, hurt by lower sales of devices and accessories, as well as digital content.

Regional discount merchandise chain Fred's Inc. also disappointed. Though Chief Executive Jerry Shore said the pharmacy department continued to do well, Fred's sales of general merchandise were hurt by declining traffic, which the retailer blamed on aggressive marketing programs by competitors.

Other pharmacy companies including Walgreen Boots Alliance Inc. and Rite Aid Corp. also posted strong results in recent days, benefiting from an early start to the flu season.

And J.C. Penney Co. became the first of the big department-store retailers to weigh in, reporting earlier this week a 3.7% increase in sales for the nine-week holiday period, an indication its turnaround efforts are paying off.

Write to Lauren Pollock at lauren.pollock@wsj.com and Michael Calia at michael.calia@wsj.com

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