Quickest 7h 21min
There are 1 train company operating 2 routes - Empire Builder, Southwest Chief, 4 flights from DDG to SPT. The cheapest train costs $393 and is 2d 1h 17min.
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There are 3 ways to travel from DDG to SPT. 4 trains, 4 flights and 1 by car are possible between the two areas. The by car from DDG to SPT is the cheapest. The flight from DDC to FCA is the fastest. The train operated by Amtrak running from DDG to SPT 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!