Microsoft bought Seattle-based airfare prediction and travel site Farecast earlier this month for around $115 million, according to a person familiar with the transaction.

A Microsoft spokeswoman would not comment on the terms of the deal, but did confirm the purchase, which closed April 9.

"Farecast has been a partner of ours on MSN Travel and we look forward to working closely with the Farecast team to incorporate and apply its technology in new and interesting ways," Whitney Burk, a spokeswoman with Microsoft's Online Services business, said in a statement.