Quickest 7h 18min
There are 3 buses 4 flights1 train company operating 2 routes - Southwest Chief, Empire Builder from Missoula to Kansas City. The cheapest train costs $325 and is 1d 16h 15min.
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There are 4 ways to travel from Missoula to Kansas City. 3 buses, 4 flights, 3 trains and 1 by car are possible between the two areas. The by car from Missoula to Kansas City is the cheapest. The flight from HLN to MCI is the fastest. The train operated by Amtrak running from ESM to KCY 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!