Gatwick says the electronic boards were displaying incorrect information because of a damaged fibre-optic cable.
According to the BBC, Gatwick staff had to bring out whiteboards (like the ones you had in school) to notify passengers of their flight statuses due to all the digital screens in the airport being downed by technical issues.
Airport staff had to write out flight information on whiteboards instead.
He said a "handful of people" had missed their flights as a result of the problem.
Photos posted on social media showed people crowding around the boards to find out the latest on their flights.
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Helen Walsh tweeted that the situation was "absolute carnage", while CheerfulChappy said Gatwick Airport was "an embarrassment to the United Kingdom, letting a simple IT problem knock out all of the departure info screens".
"Gatwick would like to apologise to any passengers affected and expects Vodafone to resolve the issue as quickly as possible".
Ollie Hurley, who said he was flying to Budapest, added: "We are having to check our flight departure time on a whiteboard? We are keeping Gatwick Airport constantly informed of progress".
The problem was caused by a damaged cable used by the airport to display flight information, a spokeswoman told Business Insider in a statement.