There are 2 airlines, 1 train company operating 3 routes - Hiawatha Service, Empire Builder, California Zephyr, 1 bus company from ORD to Milwaukee. The cheapest flight costs $270 and is 10h 9min. The cheapest train costs $31 and is 1h 22min. The cheapest bus costs $7 and is 2h 20min.
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There are 4 ways to travel from ORD to Milwaukee. 2 flights, 3 trains, 1 bus and 1 by car are possible between the two areas. The bus operated by Greyhound running from Chicago to Milwaukee is the cheapest. The flight operated by United running from ORD to MKE is the fastest. The train operated by Amtrak running from GLN 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!
There is only one bus company, Greyhound, with routes running from ORD to Milwaukee. One train provider, Amtrak, runs trains from ORD to Milwaukee. Because the bus is cheapest, we recommend taking the bus.