The "Rerum Danicarum Historica" (1631) claims that the history of Helsingør can be traced back to 70 BC, but this information is highly dubious.
The fast option is a 600 km (7 hr) drive using the Øresund Bridge and going north on the E20, turning onto the E6 toward Oslo in Göteborg. The second option is a 800 km (10 hr) drive from Copenhagen to Oslo across Århus and Ålborg in North Jutland (E20 west/E45 north).There are several types of transportation you can use to get from Copenhagen to Oslo and back, and each option has its own pros and cons that may make it more or less suitable for you to get from Copenhagen to Oslo or vice versa.With a flight time of just over an hour, flying directly from Copenhagen to Oslo is a time-saver.Take the ferry from Hirtshals (or Frederikshavn) across the Skagerrak to Larvik and drive to Oslo from there.A scenic drive, but you'll have to submit to ferry schedules. Several options here, among them a direct ferry connection from Copenhagen to Oslo in a whopping 16.5 hour trip with DFDS Seaways.
They depart in each city at 5 pm daily, arriving the next morning.
Depending on the type of cabin and season, the ferry starts around €90 for a round-trip ticket (without a vehicle).
The pricing of this option is higher than bus fares, though, but still very affordable from around 0 / £90: A great option to get from Copenhagen to Oslo or from Oslo to Copenhagen within about 8 hours.
Taking the train to Oslo (or Copenhagen) is a very comfortable and reliable method of transportation.
Other options include driving to the northern tip of Denmark and taking one of the ferries to Norway from there (see Copenhagen to Oslo by Car). Select the bus stops KÖPENHAMN (Copenhagen in Swedish) and OSLO.
Swebus Express bus line 820 is a direct bus connection of Ingerslevsgade in Copenhagen and Oslo's Busterminal/Galleriet, with several stops in Sweden. Pick this option if you're low on money and have time to spare.