Köln Bonn Airport is 20km north of central Bonn and has direct flights to 130 cities across Europe. Express bus SB60 shuttles between here and Bonn's Hauptbahnhof every 20 minutes (€7.90, 30 minutes). A taxi ride costs about €55.
Flixbus stops on Joseph-Beuys-Allee near the museums, about 2km south of the city centre.
Bonn is linked to Cologne many times hourly by U-Bahn lines U16 and U18 (€7.90, 54 minutes) as well as by regional trains (26 minutes) and long-distance IC and ICE trains.