A blizzard wreaking havoc in America’s Midwest has been predicted to cause flight delays and cancellations.

United Airlines and American Airlines are offering affected customers flexible travel options and alternatives.

United said customers planning to visit airports in Chicago, Cedar Rapids, Des Moines, Grand Rapids, Lincoln, Madison, Milwaukee, Moline, Omaha and Wichita should check flight status updates regularly.

“Customers ticketed on flights to, from or through airports in the path of the storm may reschedule their itineraries with a one-time date or time change, and the airline will waive the change fees,” United Airlines said in a statement.

Passengers can source details, eligible travel dates, updates and make changes on the United Airlines website.

Alternatively, customers can contact United Reservations at 800-UNITED-1.

Customers ticketed on American Airlines, American Eagle or AmericanConnection flights on either 20 or 21 December to, from, or through the cities listed below, and whose ticket was issued no later than Dec. 19, may have their ticket reissued without a change fee for one ticket change.

Cedar Rapids, Chicago, Des Moines, Grand Island, Grand Rapids, Green Bay, La Crosse, Madison, Manhattan, Marquette, Milwaukee, Moline, Omaha, Rochester, Sioux City, Traverse City, Waterloo, Wausau and Wichita.

To change travel dates, contact American Reservations at 1-800-433-7300 within the U.S. or Canada.

Customers outside the U.S. or Canada are encouraged to check American’s website for more information.

AccuWeather has reported rapidly deteriorating roadway conditions from eastern Colorado to central Nebraska and northwestern Kansas.