My favorite flight search site Hipmunk is raising $5.9M

Updated

Hipmunk, the recently-launched travel startup that I now use to book most of my flights, is raising a $5.9 million round of funding, according to a filing with the Securities and Exchange Commission.

The site was launched by cofounders Adam Goldstein and Steve Huffman in August. (Huffman previously cofounded social news site Reddit.) They seemed to be directly addressing many of the complaints that I have about most other online ticketing options.

Instead of giving you page after page of similar flights, Hipmunk lays out all your options in a customizable grid, making it easy to focus on the flights in the price range or time that you’re interested in. It also lets you sort by “agony”, so you can find flights that are shorter or have fewer stops, even if they’re a little more expensive.

For now, Hipmunk just features flight listings that it pulled from ticket site Orbitz, although Goldstein told me last year that he eventually plans to expand to other services.

I’ve emailed Hipmunk and will update this post if I hear back. The filing says that the San Francisco company has raised $4.7 million so far, but it doesn’t list any investors. Hipmunk was incubated by Y Combinator and earlier raised a $1 million angel round from Ashton Kutcher, Gmail creator Paul Buchheit (now a partner at YC), WordPress founder Matt Mullenweg, famous angel Ron Conway, and others.

Update: Goldstein responded: “We don’t have any comments right now, but we’ll be able to share details later this week or early next.”