Due to low visibility from fog in the Chicago area, flights were not arriving at Midway Airport Wednesday afternoon.
The airport tweeted the news just before 3 p.m., telling travelers delays were "anticipated."
"Confirm flight status w/ airline," the tweet read.
By 4 p.m., the fog was still limiting arrivals, with delays averaging 20 minutes or more and at least 14 flights canceled.
Several counties, including Cook, were under a dense fog advisory until 9 p.m.
Visibility was expected to sit at a quarter-mile or less.
Parts of the area were also under a freezing rain advisory from 5 p.m. to 9 a.m. Thursday, warning of ice accumulations of up to a tenth of an inch.