DFDS (click here for their web site) sail from Harwich to Esbjerg in Denmark.

Ferries to Denmark from Norway

• Kristiansand to Hirtshals (ColorLine Ferries). Up to 2 sailings per day. Duration 2 hours 15 minutes.
• Larvik to Hirtshals ferries (ColorLine Ferries). Up to 2 sailings per day. Duration 2 hours 45 minutes.
• Oslo to Copenhagen (DFDS Seaways). Up to 7 sailings per week. Duration 16 hours 30 minutes.
• Oslo to Frederikshaven (Stena Line). Up to 7 sailings per week. Duration 12 hours 15 minutes.