A massive snowstorm has been wreaking havoc across the Midwest, creating problems from Kansas to Michigan and leaving more than a foot of snow in some places. Jason Samenow of the Capital Weather Gang reports that the storm should fizzle before it reaches Washington.

Winter_Storm_0a4f6_image_1024w (Matt Reid/Associated Press)

But this storm has created major headaches for air travelers. More than 200 flights to or from Chicago O’Hare International Airport have been canceled, according to FlightAware.

Airlines have begun to let people flying to or from certain cities rebook without the customary fee. US Airways, American Airlines, United AirlinesDelta and Southwest Airlines have all announced that some tickets can be changed without an additional charge, though the specific airports and the dates vary from airline to airline.

If you’re flying today or Saturday, make sure to check with your airline to see how you may be affected. Even if your flight isn’t canceled and you don’t have to rebook, watch for delays.