Expedia Inc., the online-travel booking service, will acquire Orbitz Worldwide Inc. for $12 a share in cash, adding brands such as CheapTickets, ebookers and HotelClub to take on industry leader Priceline Group Inc.

The deal price represents a premium of 25 percent to Orbitz’s closing price Wednesday. The transaction is valued at about $1.6 billion, including net debt, the companies said in a statement. Bellevue, Washington-based Expedia is adding consumer travel brands, including CheapTickets, as well as business-to- business sites such as Orbitz Partner Network.

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