Diabolo infrastructure provides a quick and direct link between the SNCB station under the airport terminal and the main stations in Brussels (Brussels-Nord, Brussels-Central and Brussels-Midi). Direct trains run every 15 minutes in both directions. It takes just 17 minutes to travel into Central Brussels. To pay for this new infrastructure, every passenger travelling to or from Brussels National Airport has to pay a Diabolo supplement on top of the ticket price.
The standard ticket price for travel between the airport and the Brussels Zone is €8.60 per day (return trip €17,20), which includes the Diabolo fee. If you already have an SNCB ticket, you will have to pay the Diabolo fee separately.