Overview
There is a suburban (S-Bahn line S13) train service connecting the airport station to the city and nearby centres. See http://reiseauskunft.bahn.de/bin/bhftafel.exe/dn?input=K%F6ln/Bonn%20Flughafen&boardType=arr&time=actual&productsDefault=1111101&start=yes for more details.
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