As of about 1:30 p.m. ET Wednesday, a total of 1,445 flights in and out of the US had been canceled, according to flight tracking site FlightAware. Regional carrier SkyWest, which operates through partnerships with United, Delta, American and Alaska Airlines, had canceled more than 300 flights. Delta and Southwest had both canceled about 250 flights.
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MinneapolisSaint Paul International Airport, Denver International Airport and Detroit Metropolitan Wayne County Airport were the most heavily affected, according to FlightAware. Chicago O'Hare International Airport, Toronto Pearson International Airport and Milwaukee Mitchell International Airport were also experiencing disruption.
O'Hare has 67 delays and 128 cancelations, as of 1:30 p.m. ET.
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Southwest Airlines has issued winter weather waivers for about a dozen airports.
Delta Air Lines has issued waivers for Upper Midwest winter weather and Rockies and Mountain regions winter weather.
American Airlines and United have also issued winter weather waivers for travel this week.
The flight disruption comes after winter weather alerts were issued across 29 states, including California, Minnesota and Maine, with warnings of severe icing, extreme cold and sleet as part of the three-day storm, CNN reported.
The Minneapolis area of Minnesota is at risk of picking up at least 15 inches of snow, with the National Weather Service in Minnesota's Twin Cities warning the powerful storm "will bring widespread accumulating snow, with blowing and drifting snow mainly Wednesday through Thursday."
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