Hundreds of flights headed in and out of Denver International Airport on Sunday were delayed amid afternoon thunderstorms.
The ground delay, a traffic management program issued by the Federal Aviation Administration, started just before 3 p.m. Sunday and was scheduled to last through 9 p.m., according to the federal agency.
As of 3:15 p.m. Sunday, flights were seeing average delays of roughly an hour, according to the FAA. Those delay times were expected to increase after 4 p.m., officials said.
At that same time, 474 flights had been delayed and four had been canceled, according to data from flight tracking software FlightAware.
Southwest delayed the most flights on Sunday, 211, and 107 United flights failed to leave the gate on time.
Other DIA delays included 79 SkyWest flights, 27 Frontier flights and 18 American Airlines flights. Nearly a dozen other airlines delayed between one and 10 flights.
Southwest also canceled two flights at DIA on Sunday, according to FlightAware. United and Delta each canceled one.
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