Delayed are increasing on U.S. airlines.

The Department of Transportation said Wednesday that 80 percent of domestic flights arrived on-time in October, down from 81.1 percent in September and 84.1 percent in October of last year.

Industry trade group Airlines for America says many of the delays were due to a fire that reduced operations at an air traffic control center in Chicago for 12 days in late September and early October.

Hawaiian Airlines, Alaska Airlines and Delta had the best ratings, while regional carrier Envoy Air had the worst.

About 1.1 percent of October flights were canceled. That was better than September but worse than the previous October.

Photo Credit: Hawaiian has yet another month on top as the most on-time carrier in the U.S. Hawaiian Airlines