The cheapest way in. Nothing listed is quicker.
Bus 721 to the Hauptbahnhof
721 · RheinbahnPickup, hours & luggage
Boards at. The bus station in front of the central arrivals hall
The same Preisstufe A single, EUR 3.80, valid 90 minutes; a child EUR 2.10. Bought from the driver with small change, or in the app beforehand.
Luggage. A city bus with no hold; luggage rides with you.
Hours. Weekdays every 20 minutes from 04:35 to about 20:00, then every 30 minutes; the last is 01:09, or 01:24 on Friday and Saturday nights. Sunday from 05:09, every 30 minutes.