15 hours in Copenhagen…then 6am flight?

You absolutely got this!

The good news is that public transport is safe, reliable and can get you to the airport 24/7. Naturally there are less departures overnight, but check journeyplanner.dk to find your options. While you can trust the frequencies the metro run at, the exact departure times seem to be arbitrary in my experience. So it can be a good idea to leave a little bit earlier to avoid running late, especially if traveling by metro.

I know it is standard recommendation to be at the airport 2h30m before departure, but if you don't leave the Schengen area or travel without checked luggage, there would be no harm in arriving a little later. Copenhagen Airport is relatively efficient, e.g. waiting times at security are often less than 10 minutes, and rarely above 15-20 minutes - at least in my experience.

I would take a look at the hotels at the airport, Clarion and Comfort. You should be able to check in on arrival, leave your bags and head into town with just a day bag. Then you can have a nap and a shower before your next flight. You don't say if you're coming or going, but if you're on your way home, this is the time to check your bag(s) through and just have a change of clothes and minimal toiletries to deal with.

I had a 6 am flight from CPH to LAX a couple of years ago and showed up at the airport about 4:45 am. No problem. But I don't recommend that others be so irresponsible.

I usually stay at the Clarion at the airport before such an early flight. Quick and easy walk to check into the hotel and then to the airport the next morning. It's pricey, though. If you book a "capsule" hotel like CitizenM (one of my favorite chains) or Wakeup Copenhagen (not as nice as CitizenM imho; I suggest the Borgergade location), the 24/7 subway will take about 25-30 minutes to the airport (plus time waiting for the train.) Both hotels are a 10-minute walk to the subway station. You will get almost an extra hour of sleep if you stay at the airport.

Hello newdouglas- I saw your reply and was curious as to what subway is closest to the Wake Up Copenhagen, Borgergade location when going to/from the airport. Thanks.

. My flight leaves at 6am

What is the destination? Important to know if you need to clear passport control to get to your flight.

https://www.publictransport.dk/journey-planner will give you the answer.

You can either walk to "Walk 5 minutes to Marmorkirken St. (Metro)", take the metro to Kongens Nytorv St. (Metro) and change to the metro to the airport

OR "Walk 10 minutes to Kongens Nytorv St. (Metro)".

I am headed towards Mallorca! The tickets on SAS were very inexpensive and I figured a 15 hour layover might actually be fun. I am an optimist I guess. On the way home there in no layover fortunately.

Sorry narcuhc—just saw this. I think it’s easiest to walk to the Kongens Nytorv station. No need to take the long escalators to change metro lines.