US passenger airlines canceled 1.6% of scheduled domestic flights in July—8,390 out 520,880 scheduled flights—according to the US Department of Transportation’s (DOT) Air Travel Consumer Report and the Bureau of Transportation Statistics (BTS).

The number of cancellations largely kept pace with June (down 0.4 point) and with July 2013 (down 0.1 point).

July’s overall on-time arrival performance for US domestic scheduled flights was 75.6%, improving on June by 3.8 points and bettering July 2013 by 2.5 points.

Two domestic flights experienced a tarmac delay exceeding three hours—a July 3 US Airways flight from Charlotte, North Carolina (CLT), to New York JFK, held on the CLT tarmac for 186 minutes before taking off; and a July 17 Spirit Airlines flight from Baltimore-Washington International Airport (BWI) to Dallas-Fort Worth International Airport (DFW) diverted to Houston Bush Intercontinental Airport (IAH), due to heavy rainstorms deluging north Texas.  The Spirit aircraft waited on the IAH tarmac for 218 minutes before getting clearance to carry on to DFW.

There were no July reports of international flights with tarmac delays exceeding four hours.

US airlines with the lowest percentage of canceled July flights were: Hawaiian Airlines and Virgin America (both at 0.1%), Delta Air Lines and Frontier Airlines (both at 0.2%) and Alaska Airlines (0.4%). Envoy Airlines had the highest percentage of July cancellations (3.7%), followed by ExpressJet Airlines at 3.3% and JetBlue Airways at 3%.

Hawaiian Airlines topped the list for on-time arrivals in July, at 93.3%, followed by Delta Air Lines at 86.3% and Alaska Airlines at 84.1%. JetBlue Airways had the month’s weakest on-time arrival performance, at 65.8%, bettered moderately by Southwest Airlines (70.2%) and ExpressJet Airlines (73.4%).

In July, 9% of systemwide delays were due to late-arriving aircraft (i.e., the previous flight with the same aircraft arrived late, causing the present flight to depart late); 6.6% of delays were caused by the air carrier (i.e., circumstances within the airline’s control, such as maintenance or crew problems); 6.2% of the month’s flights were affected by national aviation system delays (i.e., non-extreme weather conditions, airport operations, heavy traffic volume, air traffic control, etc.); extreme weather was the cause of 0.7% of the month’s delays; and 0.03% of July’s delays were due to security reasons.