How it works
As you would with any search engine, enter your beginning and end cities and travel dates on Skiplagged. It sifts through the routes to your destination city and the routes that connect through it.
So say you're trying to fly from Cleveland to New York. It'll bring up all the flight itineraries from CLE to JFK, LaGuardia, and Newark. Then it goes a step further by also listing all the "hidden city routes," where a flight from Cleveland to, say, Baltimore, has a connection through Newark. Showing all the results in a handy matrix organized by price, duration, or number of legs.
You can't book the flight through Skiplagged, but you're more than welcome to go to the airline's website, book that Cleveland-to-Baltimore flight, then when you get to Newark, just walk your happy ass right out of the terminal and save a fat $107. You, one. Chimpanzees, zero.