The Priceline Group has completed its acquisition of the Momondo Group, which operates the European travel metasearch engine Momondo and flight-comparison site Cheapflights.

Priceline acquired all of Momondo's outstanding shares in the $550 million cash transaction. The acquisition was announced in February.

Momondo, headquartered in the U.K. and Copenhagen with an office in Boston, will operate under Priceline's travel search site Kayak and its CEO, Steve Hafner.

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