Dozens more flights were canceled in Denver and in Austin, Texas. Nearly 800 flights had been canceled nationwide and more than 2,000 others delayed.
Southwest and American Airlines have cancelled dozens of northern Texas-bound flights, anticipating wintry conditions for most of the week. (AP Photo/Charles Dharapak, file)
Southwest scrubbed more than 330 flights, or about 8% of its entire schedule, while American had dropped nearly 180 flights, 5% of its schedule, according to FlightAware.
The National Weather Service issued the winter storm warning for parts of north Texas starting on Monday afternoon.
High temperatures are expected to stay in the 30s until Thursday.
Beyond Texas, forecasters said ice could accumulate in neighboring Oklahoma and Arkansas and stretch east into the Deep South and Midwest this week.