Skiplagged is a new site that helps you find the lowest airfares including the kinds of fares that Kayak will not come up with… hidden cities and throwaways.

Instead of having to come up with cheaper cities to fly to through the city you’re actually planning to go to, this site does the work for you and suggests the itinerary. I’m not sure the website will last because it is helping customers to act contrary to the ticketing rules of airlines (and they certainly won’t be able to sustainably earn commissions from driving bookings, if that is indeed their model).

Last summer I wrote an extensive primer on hidden city and throwaway ticketing.

Airlines often price tickets from one city to another through a hub cheaper than flights that terminate at the hub. Flying United New York to Milwaukee through Chicago is often much cheaper than just flying New York to Chicago. But if you get off the plane in Chicago and don’t board your connection to Milwaukee, you’ve potentially saved yourself a lot of money. This is called hidden city ticketing.

This isn’t illegal but it is against most airline rules. Nonetheless, read my primer before considering trying this yourself.

I asked Skiplagged to find me a flight from New York LaGuardia to Washington National airport, and it came back with this $121 option:

It’s a flight from New York to Washington to Orlando, and tells you to skip the flight from Washington to Orlando. They also remind you “no checked bag” because of course any checked bag would go to Orlando.

This site gave me the option in seconds. I’ll probably still use ITA Software’s Matrix to ‘do-it-yourself’ these sorts of queries, but for folks who ask me “how do you know what cities to search for?” here is one tool.

You can join the 30,000+ people who see these deals and analysis every day — sign up to receive posts by email (just one e-mail per day) or subscribe to the RSS feed. It’s free . You can also follow me on Twitter for the latest deals. Don’t miss out!