There are 2 train companies operating 5 routes - ME, MEr, 131, 131, 131, 131. The cheapest train costs $46 and is 3h 59min.
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There are 3 ways to travel from Achim to Flensburg. 4 buses, 1 train and 1 by car are possible between the two areas. The by car from Achim to Flensburg is the cheapest. The by car from Achim to Flensburg is the fastest. The train operated by running from Oyten to Flensburg is the most convenient.
It's important to check each mode when booking your ticket so that you can find the best method for you. The cost of each type varies differently, so be sure to use Faretrotter to keep an eye out!