Quickest 7h 35min
There are 4 flights1 train company operating 2 routes - Southwest Chief, Empire Builder from GEG to LBL. The cheapest train costs $407 and is 2d 3h 8min.
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There are 3 ways to travel from GEG to LBL. 4 flights, 4 trains and 1 by car are possible between the two areas. The by car from GEG to LBL is the cheapest. The flight from GEG to LBL is the fastest. The train operated by Amtrak running from SPK to GCK 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!