DALLAS (AP) — Southwest Airlines and American Airlines canceled dozens of flights Monday in north Texas, which is expected to get cold, wet weather most of the week, including a chance of freezing rain.

About 30% of all flights at Dallas Love Field Airport, home to Southwest, were canceled by early afternoon, according to tracking service FlightAware. At nearby Dallas Fort Worth International Airport, which is dominated by American, nearly 15% of flights had been scrubbed.

Dozens more flights were canceled in Denver and in Austin, Texas. Nearly 800 flights had been canceled nationwide and more...