Priceline gets U.S. approval to buy Kayak WASHINGTON (Reuters) - Priceline.com Inc has won U.S. antitrust approval to buy Kayak Software Corp, the Federal Trade Commission said on Tuesday. The acquisition, announced in early November, is valued at $1.8 billion. The deal was one of several on a list of approved transactions that the FTC issues several times a week. The listing is put out by the FTC, but the approvals could come from either that agency or the Justice Department. Kayak, which offers a website and mobile applications to help consumers compare prices for airlines, hotels and rental cars, went public in July with shares priced at $26. It operates like a search engine, letting consumers compare pricing along with other websites such as Priceline.com rivals Expedia Inc and Orbitz Worldwide Inc. Priceline, which is known for its name-your-own-price auction, has the largest market capitalization of online travel agencies. Kayak will be operated independently under the leadership of its current management, which includes company co-founders Steve Hafner and Paul English, Priceline said in November. Reporting By Diane Bartz; editing by John Wallace