The disruption began yesterday (May 28) when travellers were met with extremely busy roads and cancelled Easyjet flights ahead of their half-term holidays.
Now it has only gotten worse as French border police open just two passport gates to deal with the incoming travellers.
P&O Ferries said delays were “out of their control” as the border controls were operated by French border police.
In a statement the Port of Dover said the situation was likely to remain in place for “a number of hours”.
It said: “The Port is working with its French counterparts to move tourist traffic through the Border Controls as quickly as possible.
“The Port is very busy working with all the Ferry Operators to minimise delays once through the Border Controls.”