How to take the rail journey from Copenhagen / København to Stockholm

Hopefully only for the time being, the Swedish national rail operator, SJ, has withdrawn its direct Snabbtåg train services between the Danish and Swedish capital cities.

So this journey currently involves taking Øresundståg train service to Malmo C station, and transferring there into a Snabbtåg train on to Stockholm.
Though these Øresundståg trains also depart from the city centre at
Nørreport station and Østerport station.

The connecting time between trains in Malmo is typically around 30 - 40mins; Though the trains on to Stockholm will depart from the upper level platforms in Malmo C station and the Øresundståg trains will arrive at the lower level platforms / tracks.
Though reservations are not required on the Øresundståg trains, so an option is to leave Copenhagen on an earlier train.

By direct train - hopefully resuming in summer 2025:

Final Destination: Stockholm

All trains also call at: Norrköping and Linköping

It is not possible to use these trains for journeys between København/Copenhagen and Malmo.

Book early and save: Yes

Online bookings usually open: around 6 months ahead

Seats will automatically be assigned when booking tickets for this journey, but rail pass users will need to be pay a reservation fee prior to boarding (see below).

Try to book for a date too far ahead on SJ and 'Not Available' will be displayed.
If you see this, check back and find the furthest date ahead that tickets are on sale for.

If you can be flexible with departure and arrival times, search through the day's departures to see which have the cheapest fares.
Trains leaving earlier/later on the same day can be 3 x more expensive than others.

DSB (the Danish national rail operator) does NOT sell tickets for this journey.

Rail Pass Users:

Booking reservations in advance online on the SJ website is highly recommended - particularly if you will be travelling between Friday and Sundays and around holiday dates.
It's not unknown for the most popular trains to sell out completely days in advance in both 1st and 2nd class.

The instructions for how to do this are here.

Or it's possible to avoid the rail pass fees by taking a longer alternative route.

Final Destination: Stockholm

The train also calls at: Linköping, Norrköping and Södertälje

The independent rail operator, Snälltåget, has launched a new daily direct train service from Copenhagen to Stockholm.

It is usually scheduled to depart from København H station shortly after 16:05 and arrive in Stockholm at around 22:15.

Online bookings open: around 3 months ahead

Despite not being operated by SJ, the Swedish national rail operator, journeys by these Snälltåget trains can now be booked on the SJ website.
So prices can be compared with the journey by Snabbtåg trains; and this Snälltåget train is usually cheaper.
Though it will list all of the departure options available per day and doesn't have a departure time filter, so hone in on the train which typically departs shortly before 09:15.