The disruption comes as Munich hosts its world-famous Oktoberfest beer festival, which runs until Sunday. Last week, Denmark and Norway closed airports due to drones.
This had prompted the cancellation of 17 flights, disrupting travel for nearly 3,000 passengers at the airport in the southern German state of Bavaria.
Another 15 arriving flights were diverted to Stuttgart, Nuremberg, Vienna and Frankfurt, the airport said in a statement.
German police said the airport’s runways were closed late in the evening as a precaution.
Police officers searched the area for suspicious individuals but found nothing. A police helicopter was also deployed.
Munich airport reopened later on Friday after the disruption. The development comes after sightings temporarily shut airports in Denmark and Norway last week.
The incident comes as Germany’s Oktoberfest, which draws hundreds of thousands of people every day to Munich, is approaching its final weekend.
