Can you travel to Germany with your expired German Passport?

Answer 1

It is normally not possible to travel on an expired passport. In view of current concerns about security on international flights, I would be astonished if you would even be allowed to board a plane (on an international flight) with an invalid passport. Enquire locally, but you would be well advised to renew your passport.

Answer 2

If you have a German passport, whether it is expired or not, then you are a German citizen. German citizens have the legal right to enter Germany (as do citizens of most countries have the right to re-enter their own country).

If you are a German citizen, then you also have a German ID card, which is also proof of citizenship which you can use to re-enter Germany.

If you are flying to Germany from outside the EU, then there is the additional question of what documentation the airline requires.