We flew with Scandinavian Airlines from Helsinki to Copenhagen. You can book online, which is what I did.
Everything went smoothly, the flight and the price were both good.
We would use them again.
This is absolutley the best way to go to Copenhagen. The airport, also called Kastrup was the world's best airport in 2002 and no. in 2003.
Best way to get home from Denmark/to Denmark is take a plane. Prices are inexpensive at summertime, and flight to Finland is only 1½ hours.
SAS fly directly from Dublin to Copenhagen Kastrup.
You can see the Oresund bridge to Malmo from the air, it looks extremely impressive.
From Kristiansand in Norway, its only a 50 min flight to Copenhagen. The only airline is the 'Maersk', but it is a SAS / United Airlines partner.