Kayak.com announced the completion of a $11.5 million Series C financing round led by Accel Partners, a technology-focused private equity firm with offices in London and Silicon Valley. Kayak.com will use this investment to fund extensive offline and online marketing campaigns launching this June and for European expansion scheduled for the fall.

"Kayak.com is eager to reshape the European online travel market in the same way we have improved how Americans search and book travel," said Paul English, Kayak.com CTO and co-founder. "We are delighted to add two stellar London-based Accel executives to our team. Already our product plans have seen the benefit of their expertise in mobile applications and community/social networking, and their on-the-ground leadership and relationships in European markets will be essential to Kayak.com's global growth."

Judy Gibbons, Accel Partner Advisor added, "Accel Partners always looks to work with genuinely innovative entrepreneurs, especially in the fast-moving consumer Internet space. Kayak.com has come a long way in a short time and we look forward to working with its experienced management to take the business to the next level with their expansion into Europe."

Accel's Harry Nelis joins the Kayak.com Board of Directors and Judy Gibbons, formally corporate vice president in Microsoft MSN's Division, joins as Advisor. Current Kayak.com Board of Directors include: Chairman Terry Jones, founder and former CEO of Travelocity; Greg Slyngstad, founder and former senior vice president at Expedia.com; Joel Cutler, managing director at General Catalyst Partners; Steve Hafner, Kayak.com co-founder and CEO and former executive vice president at Orbitz; and Paul English, Kayak.com co-founder and CTO and former vice president at Intuit, Inc.

Accel Partners joins existing investors General Catalyst Partners, Sequoia Capital and America Online. Kayak.com has raised a total of $30 million since the company launched in January 2004.