Originally Posted by
CaptainMiles
Stay at the airport Hilton which is attached to the terminal. Next morning you can check the bags to OSL first thing in the morning, then take the metro to downtown Copenhagen for some sightseeing without your bags. You should be able to walk around some and see the changing of the guard before heading back to the airport for your 2:40 flight.
Good suggestion to do the check-in first before heading into the city center. There may be some morning guided tours that start around 9 a.m. and finish by noon. Otherwise walking around by yourself with a map and some guide book may work out well enough.
And as security at the airport should take no longer than 10-15 minutes to clear at that time of day, an arrival back to the airport by 1:45 or even 2 p.m. should be more than sufficient even if having to deal with lines at security and passport control.