Quickest 7h 20min
There are 1 train company operating 2 routes - Empire Builder, California Zephyr, 3 buses and 3 flights from PRO to TOH. The cheapest train costs $267 and is 1d 8h 36min.
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There are 4 ways to travel from PRO to TOH. 4 trains, 3 buses, 3 flights and 1 by car are possible between the two areas. The by car from PRO to TOH is the cheapest. The flight from PVU to RST is the fastest. The train operated by Amtrak running from PRO to TOH 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!