FlightAware reported that 792 flights into or out of Chicago's O'Hare International Airport had been canceled as of 9 p.m. local time, with another 426 flights experiencing delays. Another 124 flights into or out of Chicago Midway International Airport were canceled, with 83 other flights experiencing delays. Kansas City International Airport closed to arriving flights at approximately 2:30 p.m. local time due to visibility that was reduced to less than a quarter-mile. A total of 188 flights into and out of Kansas City were canceled as of 9 p.m. local time, with another 35 flights experiencing delays. In St. Louis, a tornado warning was issued for an area including Lambert International Airport shortly before 5 p.m. local time.

Source: Fox News November 25, 2018 22:03 UTC