Quickest 7h 18min
There are 3 buses1 train company operating 2 routes - Empire Builder, Southwest Chief, and 3 flights from Kansas City to Missoula. The cheapest train costs $322 and is 1d 15h 53min.
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There are 4 ways to travel from Kansas City to Missoula. 3 buses, 4 trains, 3 flights and 1 by car are possible between the two areas. The by car from Kansas City to Missoula is the cheapest. The flight from MCI to HLN is the fastest. The train operated by Amtrak running from KCY to ESM 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!