Flights were suspended from taking off and landing at Stansted Airport from 6am to 8.20am as the runway was closed due to heavy snow, a spokesman said.
It's one of our busiest times of the day, the first wave of flights. Obviously there will be a knock-on effect but at the moment we are just concentrating on getting things back to normal.
Passengers are advised to check with their airline before they travel and are urged to take extra time to get to the airport as the roads surrounding the area are "treacherous".
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The annual event has earned a place in the record books ahead of the grand final of the 60th anniversary show in Austria this evening.
Local authorities said the move is necessary to "avert the growing number of deaths and increasing harm linked to psychoactive substances".
Some students argued that the centuries-old tradition of wearing gowns, suits and mortarboards to exams was 'archaic' and looked elitist.