Airport authorities say some flights have been delayed but they are trying to avoid any cancellations.
Terminal 1 at Berlin Brandenburg Airport (BER) has been reopened after a hazardous materials incident was triggered on Thursday night, prompting the evacuation of the building.
"The police operation has ended," an airport spokesperson said.
The closure and evacuation was prompted by a report from a woman who allegedly told federal police she was carrying toxic substances in her handbag.
A police spokesperson confirmed to the Tagesspiegel daily that Terminal 1 was then evacuated.
Passengers were ordered to leave the building and flights were temporarily suspended.
According to the federal police, the woman had mentioned the allegedly dangerous substances at the service desk.
As it was initially unclear what substance was involved, a precautionary hazardous materials alert was declared.
Police gave no information as to the nature of the substance the woman was allegedly carrying and results of an analysis are expected in the coming days.
A security cordon was then set up around the handbag. Large numbers of emergency responders were deployed to BER. Alongside the airport fire brigade, several fire services from the Dahme-Spreewald district were also involved in the operation.
According to Tagesspiegel and the dpa news agency, rail services to and from the airport were also temporarily suspended.
An airport spokesperson insisted that "flights were not stopped," and said that full airport operations would resume by Friday.