The journey by train from the Düsseldorf Hauptbahnhof to the main railway station of Cologne (Köln Hauptbahnhof) takes only half an hour. The ticket to the second class of the direct high-speed train InterCity (IC) will cost 11.50 EUR. Another 4 EUR will need to be paid if you want to pre-select and book a place for yourself. The trip in the first class will cost 18.50 EUR, plus 4 EUR for choosing the place yourself.

There are trains that come to the second railway station of Cologne, Köln-Deutz (sometimes written by Köln Messe / Deutz). Express train InterCityExpress (ICE) arrives on it, the ticket for which is somewhat more expensive. The fare in the second class is 17 EUR, and in the first 27.50. Additional payment for the seat selection is 4 EUR

Also it is possible to get on the regional trains (RE), but to check the ticket prices and buy them online will not work