United Airlines has halted flights at major airports across the US over a "technology issue", according to the company, BBC reported.

A ground stop was issued for the company's mainline flights from departure airports, causing issues at airports including Chicago, Denver, Houston, San Francisco and New Jersey, the US Federal Aviation Administration's website shows. 

"We expect additional flight delays this evening as we work through this issue," United told the BBC's US partner CBS News. 

"Safety is our top priority, and we'll work with our customers to get them to their destinations," the company said, according to BBC.