This information about transportation options in Marl might help your romantic getaway go off without a hitch: To get to Marl, book a flight to Dortmund (DTM), which is the closest major airport, located 24 mi (38.7 km) from the city center. Local metro stations include Marl Mitte S-Bahn and Marl-Hamm S-Bahn. If you want to venture outside of the area, hop aboard a train at Marl-Sinsen Station.