Thanksgiving travelers pack Chicago’s O’Hare International Airport, Terminal 3 on Wednesday. (Credit: Susanna Song/CBS)

CHICAGO (CBS) — A fog blanketing Chicago affected Thanksgiving travel plans on Wednesday.

UPDATED: 11/21/2012 11:20 a.m.

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Travelers had problems at both O’Hare and Midway airports, as a dense fog, delayed hundreds of flights and made for a slow morning drive through the city.

CBS 2’s Megan Glaros says dense fog will continue through much of the morning with slow gradual improvement in conditions possibly beginning as early as mid to late morning but possibly not improving until afternoon in some areas.

Visibility in some locations was down to just a few feet on Wednesday morning. Most locations had visibility at about a quarter-mile early Wednesday.

As of 11 a.m., O’Hare saw more than 100 flights cancelled and 302 flights delayed. Delays were averaging about 20 to 60 minutes for flights arriving and departing, according to the Chicago Aviation Department.

At Midway, flights were experiencing “major delays,” earlier on Wednesday morning. The airport saw 107 delays and 35 cancellations, according to

As of 11 a.m., Midway was starting to get back on schedule.

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Gara Lander, ironically, was traveling from a city famous of fog: San Francisco.

She said she was trying to get from O’Hare to Peoria, but her connecting flight there was canceled. The only way home now is to take a bus or stay here.

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O’Hare ranks No. 1 in terms of the most travelers passing through the airport over the Thanksgiving holiday.

WBBM Newsradio’s Nancy Harty found this group of O’Hare travelers who are escaping the fog and headed to Jamaica. (Credit: Nancy Harty/WBBM Newsradio)

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Other travelers were nervously watching the departure boards, hoping that once the fog clears that flights will get back on schedule.

Hannah Ducey, of Algonquin, was traveling to Nashville. She said the drive to the airport was dicey.

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“We couldn’t see any road signs in front of us, or the house next door, so we left three hours early,” she said.