At least 599 flights were canceled or delayed Thursday at Denver International Airport as blowing snow buffeted Colorado. As of 3:45 p.m., 536 flights at DIA had been delayed and 63 were canceled, according to data from the flight tracking company FlightAware.

A winter storm in Texas is causing widespread flight cancellations, particularly in Dallas, a major airline hub.

According to FlightAware, there are 13,031 flights delayed and 1,650 total cancellations as of Thursday morning.

As of 2 p.m. Tuesday, 600 flights at DIA had been delayed and another 14 were canceled, according to data from flight tracking software FlightAware.

Nearly half of all flights in and out of DFW International Airport and Dallas Love Field are canceled with snow and sleet falling throughout the region and more expected through Thursday. The FAA issued a ground stop for all flights departing for DFW Airport from other airports,