Priceline to buy Kayak for $1.8B By Danny King / November 08, 2012 Share 1 -- Online travel agency Priceline.com will buy travel metasearch company Kayak for $1.8 billion.Priceline will pay $40 a share for Kayak, including $1.3 billion in stock and $500 million in cash, the companies said Thursday afternoon. The purchase price represents a 29% premium over Kayak’s closing price Thursday. Kayak, founded in 2004, went public at $26 a share last July, 20 months after first filing for its initial public offering. Kayak said Thursday that its third-quarter net income rose 14% from a year earlier to $8 million, while revenue jumped 29% from a year earlier to $78.6 million. Year to date, Kayak’s net income jumped fivefold from a year earlier to $19.4 million. Revenue was up 34% to $228.9 million.Priceline in 2010 overtook Expedia to become the world’s largest online travel agency by sales, though Expedia has about four times Priceline’s share among U.S. travelers.Follow Danny King on Twitter @dktravelweekly.