Quickest 2h 35min
There are 4 buses1 flight1 train company operating 3 routes - ICE42, ICE82, ICE43 from Köln to Kaiserslautern. The cheapest train costs $37 and is 3h 38min.
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There are 4 ways to travel from Köln to Kaiserslautern. 4 buses, 1 flight, 2 trains and 1 by car are possible between the two areas. The by car from Köln to Kaiserslautern is the cheapest. The by car from Köln to Kaiserslautern is the fastest. The train operated by running from Porz-Wahn to Kaiserslautern 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!