Thunderstorms in the south and central United States caused flight delays during Memorial Day weekend, the beginning of the summer travel season.

May 26, 2025, 7:42 p.m. ET
Hundreds of thousands of people traveling in parts of the Southeast and central United States faced delays and uncertainty on Monday because of severe thunderstorms that caused damaging winds and heavy rains during the busy Memorial Day weekend.
There were more than 5,000 delayed flights to, from and within the United States on Monday, according to FlightAware, a company that tracks flight information. The airports most affected were in Texas and Colorado.
Dallas Fort Worth International Airport had warned that it was expecting a busy period of travel, estimating that about 1.4 million passengers would pass through the airport from May 22 through May 27. More than 1,000 flights to and from the airport were delayed on Monday.
Another 600 flights were delayed in Houston, flying to and from George Bush Intercontinental Airport.
Denver International Airport, where nearly 1,000 flights were delayed on Sunday, said it expected 443,000 passengers to travel through the airport during the holiday weekend. On Monday, nearly 1,000 flights were delayed to and from the airport.
The Denver airport said in a statement that it had received a report that a flight was struck by lightning on its descent on Sunday. The flight arrived safely and no injuries were reported, the airport said. Southwest Airlines operated the flight, which departed from Tampa, and said the plane had been taken out of service for inspection.
The storms on Monday could result in large hail, damaging winds and flash floods in parts of the Southern Plains and Lower Mississippi River Valley, forecasters said.
The potential for tornadoes loomed in some areas, and tornado warnings were issued on Monday in parts of Texas, Alabama and Mississippi. In parts of east-central New Mexico and western Oklahoma, there was a slight risk of hail and strong winds.
In Texas and Mississippi, more than 29,000 customers in each state were without power on Monday night, according to PowerOutage.us. In Louisiana, more than 14,000 customers were without power.
More storm activity was expected on Tuesday.
For the five days that started on May 22 and will end on Tuesday, AAA forecast that a record 45.1 million people in the United States would travel at least 50 miles from home. AAA said it expected 3.61 million people to travel by plane and 39.4 million people to travel by car.
Amanda Holpuch covers breaking news and other topics.