Quickest 7h 23min
There are 4 buses1 train company operating 3 routes - Hiawatha Service, California Zephyr, Empire Builder, 3 flights from Grand Junction to Milwaukee. The cheapest train costs $225 and is 1d 3h 2min.
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There are 4 ways to travel from Grand Junction to Milwaukee. 4 buses, 2 trains, 3 flights and 1 by car are possible between the two areas. The by car from Grand Junction to Milwaukee is the cheapest. The flight from GJT to MSN is the fastest. The train operated by Amtrak running from GJT to MKE 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!