It seems the Danish are early risers, as the airport starts getting busy at 06:00. The morning peak period is usually between 06:30 and 12:00, while the afternoon peak starts around 15:00 until 18:30. If you are worried about queues, try and time your arrival or departure before or after the busiest times. For extra convenience, try and book a car that allows online check-in. Search rental cars on KAYAK