Quickest 3h 4min
There are 4 buses2 train companies operating 3 routes - IC60, 975, ICE42 from Heilbronn to Sonthofen. The cheapest train costs $40 and is 3h 23min.
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There are 3 ways to travel from Heilbronn to Sonthofen. 4 buses, 1 train and 1 by car are possible between the two areas. The by car from Heilbronn to Sonthofen is the cheapest. The by car from Heilbronn to Sonthofen is the fastest. The train operated by running from Vaihingen an der Enz to Immenstadt im Allgäu 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!