Unless you're connecting from an incoming flight into Copenhagen I would not recommend flying. Best choice would be either the train or to rent a car, and that choice really depends on what's most convenient for you. For instance:
Do you need a rental car before or after the drive? Do you want to do some sightseeing along the way? If the answer is 'no' to both questions, then you're better off taking the train. And if the answer is 'yes' to one of the questions, you should probably rent a car.
Traffic in Denmark and Sweden is on the right, just like the USA. You will have about a four hour drive from Copenhagen to Gothenburg. That's just the driving time, and it depends a bit on where in Copenhagen you start out. You should drive across the bridge between Denmark and Sweden. The other choice would be to head north out of Copenhagen and take the 20 minute ferry from Helsingør to Helsingborg. Distance somewhat shorter, but more complications since you have to wait a bit for the ferry. In other words, no time saved.
Anyway, my recommendation: follow Highway E20 from Copenhagen through the tunnel and across the bridge, and then the entire way to Gothenburg (Göteborg in Swedish). It's a freeway the entire distance. As long as you pay attention to signs with "Göteborg" and "E20" you'll be fine. And just so you don't get confused, Highway E6 along this stretch is identical to E20. In other words, it is one and the same freeway here. (North of Gothenburg, E6 and E20 will split up and go in different directions).
If you take the train, bring as much luggage as you can carry! The website of the Swedish Railway system:
http:/www.sj.se
Make sure you go to the English version!
Edited: 14 years ago