Following a foggy Sunday morning, more than 400 flights were delayed out of Denver International Airport.

As of 7 p.m., airline and airport tracker site FlightAware showed a total 419 flights delayed throughout the day. Notably, those delays affected three major airlines.

Throughout Sunday, SkyWest saw 129 delays, while United Airlines experienced 116. Southwest Airlines had 83 delays. Other airlines saw between one and 37 delays (Frontier), including a United flight cancelation.

By 3 p.m., the number of delayed flights reached over 300.

International carriers were also affected. Air Canada had four delays and British Airways two.

A patchy fog clouded the airways and metro Denver for the better parts of Sunday morning. The DIA area experienced a half mile or less visibility from about 7:35 a.m. to 10:10 a.m., 9News meteorologist Chris Bianchi told The Denver Gazette.