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