The cheapest way to the airport. Nothing listed is quicker.
S19 or RE6 to Köln Hauptbahnhof
S19RE6 · DB Regio NRW (S19) and National Express (RE6), RheinlandtarifPickup, hours & luggage
Boards at. Köln Hauptbahnhof — the S19 from platform 10, the RE6 from platform 3
EUR 4.00 an adult, EUR 1.80 a child aged 6 to 14, EUR 9.60 for a 24hTicket, EUR 19.20 for the 24hTicket 5 Personen (up to five people, 24 hours, on every bus, tram, S-Bahn and regional train in the city) — cheaper than five singles at EUR 20.00. The EUR 2.90 Kurzstrecke is not sold for S-Bahn or regional trains. The KölnCard covers the same area for EUR 9.00 (one person) or EUR 19.00 (five), sold at the same machines.
Luggage. Commuter trains with racks and standing room; full at rush hour.
Hours. Every 20 minutes from 04:01, dropping to every 30 minutes through the night on the same S19 that runs all night the other way; the RE6 adds an hourly service by day. On the same dated engineering nights as the airport-bound S19, this direction stops early too and a replacement bus covers it.