SAN DIEGO - Tens of thousands of travelers are heading back home on Sunday after the long Thanksgiving Day weekend.

There has been a consistent flow of people outside and inside Lindbergh Field. Nearly 60,000 people will have flown in and out of Lindbergh Field on Sunday, making it the busiest travel day in San Diego.

"We had to get here extra early but we had to wait here because of long lines," said traveler Merissa Holliday.

Traveler Leon Bartolino told 10News, "Well, we expected this line. We're from Las Vegas. We expected it. We're just grateful there are no cancellations or delays."

However, that could all change. The National Weather Service in San Diego has issued a dense fog advisory for the coastal areas and western valleys. It will be in effect from 9 p.m. Sunday until 10 a.m. Monday.

So far, there are few delays. Only a few flights have been delayed that are scheduled to depart within the next few hours. There are about a dozen arrival delays, with most originating from the East Coast. It is unclear if the delays have anything to do with the fog. Click here to check the status of flights at Lindbergh Field.