At least 413 flights were canceled or delayed Tuesday morning at Denver International Airport as snow fell across Colorado. National Weather Service meteorologists said 1 1/2 inches of snow stacked up at the Denver International Airport and another 2 to 5 inches is expected by 11 p.m. As of 11:00 a.m. Tuesday, 399 flights at DIA had been delayed and 14 were canceled, according to data from flight tracking software FlightAware. Southwest delayed the most flights Tuesday morning at 122 and 115 United flights failed to leave the gate on time.