CHICAGO (CBS)– Chicago airports have canceled over 300 flights amid an ice storm warning.

As of 9:29 p.m. Tuesday, 261 flights have been canceled at O’Hare International Airport, and 74 flights have been canceled at Midway Airport.

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Average delays at O’Hare are about 31 minutes and less than 15 minutes at Midway.

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An ice storm is expected to move through the Chicago area Tuesday evening, with up to four-tenths of an inch of ice possible.

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