Quickest 2h 17min
There are 2 flights 4 buses1 train company operating 4 routes - RE5, CNL 1258, ICE28, IC26 from TXL to RLG. The cheapest train costs $37 and is 2h 46min.
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There are 4 ways to travel from TXL to RLG. 2 flights, 4 buses, 5 trains and 1 by car are possible between the two areas. The by car from TXL to RLG is the cheapest. The train operated by DB running from Berlin to Huckstorf is the fastest. The train operated by DB running from Berlin Hbf to Mistorf 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!