Midway and O'Hare airports both ranked in the top 10 for on-time arrivals for the month of September, according to the Bureau of Transportation Statistics survey.
Planes arrived on-time about 87 percent of the time at each Chicago airport in September. However, at Midway, planes took off on-time only about 82 percent of the time, putting that airport near the bottom of the list of major airports.
At 86 percent on-time departures, O'Hare placed near the middle of that list.
September 2010 Major Airport On-Time Performance
The nation's 29 major airports
Source: Research and Innovative Technology Administration, Bureau of Transportation Statistics
O'Hare 16th (86.27 percent on time)
Midway 26th (81.78)
Best: Portland (91.77)
Worst: JFK (78.14)
O'Hare 8th (87.05)
Midway 4th (87.82)
Best: Denver (90.02)
Worst: San Francisco (75.79)