Quickest 1h 8min
There are 1 train company operating 4 routes - RE9, ICE10, ICE43, RE1 from Aachen to Köln. The cheapest train costs $17 and is 1h 25min.
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There are 3 ways to travel from Aachen to Köln. 3 buses, 2 trains and 1 by car are possible between the two areas. The by car from Aachen to Köln is the cheapest. The by car from Aachen to Köln is the fastest. The train operated by DB running from Aachen to Porz (Rhein) 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!