For a 6:30 AM flight you should be at the terminal at least 2-2.5 hours beforehand, for domestic flights 2 hours is often enough, but for international flights I'd plan the full 2.5 hours 🛫 That gives you enough buffer for check-in, security, and getting to your gate without stressing out. If you're driving and don't know where Frankfurt airport gets particularly crowded, I'd factor in an extra 30-45 minutes beforehand just for finding a parking spot - with such early flights the airport itself is less busy, but the drive there can be tricky depending on traffic conditions.