More than 600 flights were cancelled at O'Hare International Airport on Saturday morning ahead of a major winter storm expected to wallop the region with around 10 inches of snow.

According to the flight-tracking website FlightAware.com, 627 flights scheduled to arrive at or depart from O'Hare had been cancelled as of 9:45 a.m. In addition, 331 flight delays were reported.

Delays at the airport were averaging 37 minutes, the Chicago Department of Aviation said on its website.

Due to the snow and ice, the Federal Aviation Administration instated a ground delay at O'Hare, which was averaging five hours. Similarly, a ground stop was put in place for a period of the morning but had been lifted by 9:45 a.m.

The situation was better at Midway Airport, where 29% of flights had been canceled

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