Videos posted on social media showed passengers huddled outside the terminal with the luggage.
According to one passenger the fire alarm went off inside the airport.
Passengers were made to stay outside in the cold until they were given the all-clear.
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A woman is escorted by police during Mad Friday in Newcastle
Passengers are now being let slowly back into the terminal, but it isn't clear what caused the evacuation or what delays this may cause for travellers today.
Leeds Bradford Airport were approached for comment.
Last year Leeds Bradford was one of Britain's top 15 busiest airports, with over 3.6 million passengers.