The average train between Cologne and Flensburg takes 6h 51m and the fastest train takes 6h 14m. There is a train service every few hours from Cologne to Flensburg. The journey time may be longer on weekends and holidays; use the search form on this page to search for a specific travel date.
Trains run hourly between Cologne and Flensburg. The earliest departure is at 2:09 AM at night, and the last departure from Cologne is at 8:11 PM which arrives into Flensburg at 7:43 AM. All services require a transfer, and take on average 6h 51m. The schedules shown below are for the next available departures.

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6h 30m • 1 changeWant to know about travelling from Cologne to Flensburg? We have put together a list of the most frequently asked questions from our users such as: What is the cheapest mode of transport? What is the quickest option? How much do tickets usually cost? and many more.
No, there is no direct train from Cologne to Flensburg. However, there are services departing from Köln Hbf station and arriving at Flensburg station via Hamburg Hbf station. The journey, including transfers, takes approximately 6h 51m.
Cologne to Flensburg train services, operated by Deutsche Bahn Intercity (DB IC), depart from Köln Hbf station.
Cologne to Flensburg train services, operated by Deutsche Bahn Regio (DB Regional), arrive at Flensburg station.
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The distance between Cologne and Flensburg is 459.6 km. The road distance is 569 km.
You can take a train from Köln Hbf to Flensburg via Hamburg Hbf in around 6h 43m.