The low visibility from the fog kept planes from landing at the airport.
The hazy conditions started Tuesday morning.
Many passengers spent the night made several trips to the airport over the past two days just to learn their flights had been canceled or delayed.
Some passengers spent the night in the airport.
"Missing my family and you get aggravated as everything gets delayed and so on," said P.J. Visser.
Delta Airlines provided a chartered bus to the Memphis airport to help passengers get to their destinations.
Passengers are urged to check their flights before heading out to the airport