More than 11,400 flights canceled Sunday as massive winter storm sweeps across US01/26/2026NASHVILLE, Tenn. (AP/WBCL) — A massive winter storm set the stage for a brutal travel day Sunday, with airlines warning of widespread cancellations and delays at some of the nation’s busiest airports. More than 11,400 flights canceled Sunday as massive winter storm sweeps across US, according to flight tracking site FlightAware. Aviation analytics company Cirium says their data shows that Sunday will be the highest cancellation event since the pandemic — with over 29% of all U.S. departing flights axed. As of Monday morning, more than 4,300 flights were cancelled and more than 9,400 were delayed. Click here to visit FlightAware for the latest cancellation and delay numbers.