4. Chicago O'Hare International
chicago ohare worst airports
% of on-time departures: 76.6%
% of on-time arrivals: 79.6%

Chicago's O'Hare International was the nation's second busiest airport in 2012, with more than 310,000 flights.

O'Hare itself was developed to ease overcrowded conditions at Midway, which for years was the world's busiest airport.

The airport's on-time departure performance improved in 2012, rising to 76.6% of all departures from 74.4% in 2011.


Source: United States Department of Transportation's Ranking of Major Airport On-Time Departure Performance January 1-December 31, 2012.
- Last updated May 02 2013 10:37 AM ET
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