One of two major airports serving the greater Chicago area, O'Hare International can be found in the northwestern-most corner of the city. It's regarded so highly that in 2012 it was awarded the Global Traveler Award for Best Airport in North America for the 13th year in a row. With eight runways, O'Hare is the second-largest hub for United Airlines, carrying more than 45 percent of all passengers into and out of the facility. As a centrally located airport that transports more than 65 million passengers annually, it's not hard to find cheap flights through this major hub.