Travel planning site Kayak has bought rival SideStep for a reported $200 million, reports TechCrunch.

Kayak is making use of the $196 million it raised from a recent round of financing. The deal brings SideStep's affiliate program, display ad and email marketing businesses under Kayak's control, which according to the report will make the combined company fairly profitable.

While Kayak is currently the more profitable entity — sporting $50 million in revenue compared to SideStep's $35 million — SideStep has grown significantly in the last couple years. It also operates in part via VC funding.