United Airlines planes at Denver International Airport in Denver, Colorado on Wednesday, July 2, 2025.

United Airlines on Wednesday said that it has suspended flights due to a tech issue, and anticipates additional flight delays in the evening.

“Due to a technology issue, we are holding United mainline flights at their departure airports,” the airline said.

The U.S. Federal Aviation Administration earlier said it issued a ground stop for United Airlines flights at several U.S. airports.