Quickest 3h 4min
There are 4 buses1 flight1 train company operating 5 routes - ICE43, CNL 1258, EC62, ICE42, IC62 from Köln to Heidelberg. The cheapest train costs $98 and is 7h 35min.
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There are 4 ways to travel from Köln to Heidelberg. 4 buses, 1 flight, 2 trains and 1 by car are possible between the two areas. The by car from Köln to Heidelberg is the cheapest. The by car from Köln to Heidelberg is the fastest. The train operated by running from Porz-Wahn to Heidelberg 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!