Airlines are doing a better job of arriving on time, although more than one in five flights still run late.

The U.S. Transportation Department said Tuesday that the nation’s biggest airlines achieved an on-time arrival rating of 79.6 percent in April. That is up from 77.6 percent in March and 77.3 percent in April 2013.

The most punctual airlines were Hawaiian, Alaska and Virgin America. The most likely to be late were ExpressJet, Southwest Airlines and Envoy, which used to be called American Eagle.

The government says canceled flights were down, and no domestic flights were stuck on the ground for more than three hours.

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Photo Credit: In this Tuesday, Nov. 29, 2011, file photo, a passenger walks through an American Airlines baggage claim area at O'Hare International Airport in Chicago. Nam Y. Huh / AP Photo