According to the Department of Transportation, only about half of the flights took off when they were supposed to. That put Midway in last place among the 29 airports tracked by the U.S. Bureau of Transportation Statistics.
It appears much of the problem can be linked to Southwest Airlines, the main carrier at the airport.
More than 67 percent of the flights arriving at Midway were on time. That puts Midway in 21st place among the 29 airports. O'Hare was 19th.
Chicago-based United Airlines ranked first in on-time arrivals when compared to other major domestic carriers.