Quickest 7h 31min
There are 4 flights1 train company operating 2 routes - California Zephyr, Texas Eagle, and 3 buses from SLC to GGG. The cheapest train costs $368 and is 1d 22h 2min.
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There are 4 ways to travel from SLC to GGG. 4 flights, 3 trains, 3 buses and 1 by car are possible between the two areas. The by car from SLC to GGG is the cheapest. The flight from SLC to TYR is the fastest. The train operated by Amtrak running from SLC to LVW 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!