There have been 417 delayed flights coming into or leaving O'Hare on Monday. Midway Airport has experienced 120 delayed flights in the same time frame.
Over 2,700 flights have already been canceled Monday across the U.S.
The cancelations this past weekend were fueled by the massive winter storm that stretched from the Great Lakes area to the Mexican border. About 60% of the U.S. population faced some sort of winter weather advisory or warning, and temperatures plummeted drastically below normal from east of the Rocky Mountains to the Appalachians, the National Weather Service said.
Travelers going through Chicago on Christmas Eve were hit the hardest with over 400 flights canceled between the two airports.
The Christmas Eve cancelations in Chicago were among more than 2,300 canceled nationwide, according to FlightAware. Arrival delays at Midway were close to two hours on Dec. 24.
Over 250 flights going through Chicago were canceled on Christmas Day.
Check here for the latest numbers on the total number of cancelations and delays in Chicago airports.