The closest airport to Cologne Martin Church is the Cologne Bonn Airport (CGN). Upon arriving at the airport, you can take a taxi or use public transportation to reach the church.
Köln Hauptbahnhof (Cologne Central Station) is the main train station and is well connected to most major cities in Germany and other European countries. From there, you can take a short walk, hop on a tram, bus, or take a taxi to Cologne Martin Church.
If you're traveling by car, you can use navigation systems and set the destination to "An St. Martin 8, 50667 Köln", which is the address of Cologne Martin Church. Parking is available in nearby public parking lots, such as Heumarkt or the old town parking.
If you are arriving by a river cruise on the Rhine, you'll likely dock at the Passenger Ship Terminal Cologne which is within walking distance or a short taxi ride away from the church.