Munich airport was forced to close on Thursday evening after several drones were spotted hovering over the travel hub.
At least 20 flights were grounded as a result, German news outlet Bild reported.
The travel disruption could affect thousands of passengers as the German city has been welcoming revellers from around the globe for its world famous Oktoberfest beer festival.
Federal police confirmed the drone sightings, but said no information on the type and size of the devices could be provided.
According to local reports, the first drones were spotted at around 9.30pm on Thursday and reported to police.
