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Travelers heading to or from Colorado this weekend might have to rearrange their plans thanks to a big spring snowstorm.

As of 3 p.m. Saturday, the flight tracking website FlightAware.com reported that 849 flights into and out of Denver International Airport had been canceled. 

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The Denver airport is encouraging passengers to check their flight statuses via Twitter early and often, CNN reported.

Colorado’s capital city is expected to get 8-16 inches of slushy snow by Sunday, according to CNN. In fact, most of the state as well as southeastern Wyoming will likely get at least 24 inches of snow this weekend.

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Southwest, United and Frontier airlines are offering change-fee waivers or refunds to passengers affected by the cancellations, CNN said. United plans to proceed with flights on Sunday.

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