When do I have to be at the airport, at the very latest?
90 minutes prior to the scheduled departure time. Boarding starts 30 minutes prior to departure. If you have checked in early, you should be at the airport (passport control) no later than 60 minutes prior to the scheduled departure time.
If you have already checked in and are travelling without baggage, the latest time you have to be at the departure gate is the time printed on your boarding pass.