Flight search engine company Hipmunk has raised $5.9 million in funding according to an SEC filing. Hipmunk was co-founded by Adam Goldstein and Steve Huffman this past August. Huffman is a co-founder in Reddit. Hipmunk is known for laying out flight information in a customizable grid after conducting a search. Hipmunk has raised a total of $4.7 million in funding. The company was incubated by Y Combinator and they have raised a $1 million angel round from Ashton Kutcher, Paul Buchheit, Matt Mullenweg, Ron Conway, etc. The investors in this round was undisclosed.

Three years ago, Conde Nast bought out Reddit. Reddit is a website where a community of users vote on the most interesting stories. The most interesting recent stories land on the Reddit homepage and receive a large number of visits. Conde Nast has been taking a hit lately as its been discovered that they may lose $1 billion in ad revenue this year.

Steve Huffman and Alexis Ohanian both founded Reddit after launching it from Y-Combinator. Christopher Rowe and Aaron Swartz joined the team shortly after the company was founded. Y-Combinator is an incubation firm started by Paul Graham. Both of the Reddit founders are leaving for personal reasons.

Huffman is moving back to Virginia to spend more time with his wife. Ohanian plans to spend some time traveling. Rowe will be staying with Reddit for a while. Swartz was fired from Reddit two years ago for not respecting the company rules after being acquired by Wired Magazine.