United Airlines has rough on-time record in June

United is having some on-time performance issues. Photo: United Airlines.

United is having some on-time performance issues. Photo: United Airlines.

United Airlines struggled with its June on-time performance, according to metrics an industry source shared on Tuesday night. 

About half of all United flights in June arrived on time, statistics compiled earlier this week show. That's using a metric the industry calls 'A:00,' meaning the flight arrived exactly on time or early. Remember that the Department of Transportation only considers flights late if they arrive 15 minutes or more behind schedule, so United's official on-time rate will be a little better than this when it's announced. 

United ranked behind the three other major U.S. carriers in 'A:00' on-time arrival performance. According to United's data, Delta led the nation with an A:00 rate of about 66%, with American second at 60%. Southwest was third at about 53%. 

United's 'D:00 rate' - or departures that left exactly on time or early - was even worse. It was about 42% in June, according to the airline's internal numbers. United's 'D:00' goal for June was 54.9%.

So what's United's problem? I can't say for sure, but Brett Snyder at Cranky Flier suggests the issues are partly related to a labor dispute the airline is having with its mechanics.