Quickest 3h 0min
There are 1 train company operating 3 routes - EC62, ICE42, IC62, 1 bus from Heidelberg to Augsburg. The cheapest train costs $70 and is 3h 2min.
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There are 3 ways to travel from Heidelberg to Augsburg. 3 trains, 1 bus and 1 by car are possible between the two areas. The by car from Heidelberg to Augsburg is the cheapest. The train operated by DB running from Heidelberg to Westheim (Schwab) is the fastest. The train operated by DB running from Heidelberg Hbf to Augsburg Hbf 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!