Just as the holiday travel season gets underway, daily dense fog here has played havoc with passengers’ flight plans in and out of San Diego International Airport. And the potential for more disruption remains in play. Over the past three days, nearly 800 flights coming into and leaving the airport were delayed, according to the flight tracking service FlightAware. While the National Weather Service is seeing signs that lowered visibility from fog may be moving inland, there remains the possibility of a late-night advisory. “We think closer to the Interstate15 corridor we may see areas of dense fog tonight, but there’s still the question of when it becomes widespread enough for it to be an issue,” said Casey Oswant, a lead forecaster with the National Weather Service, on Friday. “The fog can be kind of finicky, but now most of the dense fog has dissipated from the coast, so we need to see dense fog observed along the coast before we pull the trigger on an advisory.” By early evening, there were only low clouds emerging near the coast, although dense fog could still form overnight, said National Weather Service meteorologist Brandt Maxwell. It’s still too early to say exactly where there may be fog, although it could be most prevalent slightly inland, east of Interstate 5, as opposed to west of the freeway, which was the case Thursday night, Maxwell said. San Diego airport officials are forecasting that as many as 1.3 million people will fly in and out of the airport over an 18-day holiday period that began Thursday. Some of the busiest times at the airport are expected to be Friday through Monday. The airport posted a travel alert Friday morning on social media advising passengers to be “aware we’re experiencing some flight delays due to fog. Check with your airline before leaving for the airport.” Visibility could be as low as 1 mile Friday evening as a result of fog, Oswant said, but that’s not nearly as bad as Thursday night when visibility dropped to just a quarter-mile around the airport at 8 p.m. It later fell to below a quarter-mile up until 4 a.m. Friday, she added. Related Articles Business | Be prepared, San Diegans, the holiday traffic rush is upon us. Here are the best and worst times to drive and fly Business | It’s official: San Diego gets coveted nonstop flight to Washington, D.C. Business | This Coronado resort hotel is planning a $220M makeover. So what’s in it for locals? Business | San Diego reaches settlement with SeaWorld on pandemic back rent. Here’s what they’ll pay Business | San Diego has a new nonstop flight to Toronto — with no middle seats There were more than 300 flight delays in and out of the airport on Friday alone, according to FlightAware. Part of that is due to the ripple effect of consecutive days of delayed flights as airlines try to get passengers on later flights. “Year-round weather conditions can impact both departing and arriving flights,” airport spokesperson Nicole Hall said Friday. “Beginning on Thursday and continuing into Friday, a dense low fog cover impacted visibility at the San Diego International Airport. Consequently, more than 100 flights were diverted to other airports and about 30 were canceled. It is possible that fog will persist and continue to create challenges.” She noted that Airport Authority staff and volunteers will be onsite to help passengers and minimize crowding in the airline gate areas. As a precaution, she said that passengers should continue to check the status of their flights before getting to the airport. Fog or no fog, she added, delays are a fact of life when it comes to air travel, especially during one of the airport’s busiest seasons.