Quickest 3h 25min
There are 1 train company operating 4 routes - ICE91, ICE11, EC62, 930, 4 buses from Regensburg to Reutlingen. The cheapest train costs $79 and is 6h 40min.
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There are 3 ways to travel from Regensburg to Reutlingen. 2 trains, 4 buses and 1 by car are possible between the two areas. The by car from Regensburg to Reutlingen is the cheapest. The by car from Regensburg to Reutlingen is the fastest. The train operated by DB running from Regensburg to Wernau 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!