Bus from Munich Airport
Quick answer: The Lufthansa Express Bus runs from both terminals to the city center every 20 minutes, 06:25–22:25 daily, taking about 45 minutes. A one-way ticket is €12 online or €13 from the driver.
Lufthansa Express Bus
Despite the name, it's open to any passenger, not just Lufthansa flyers. It runs on a fixed schedule from both Terminal 1 and Terminal 2 to central Munich stops.