Quickest 7h 35min
There are 4 flights1 train company operating 2 routes - Southwest Chief, Empire Builder from LBL to GEG. The cheapest train costs $407 and is 2d 3h 8min.
Faretrotter is a travel aggregation resource that gathers travel company amenities and statistics and compares modes of transportation between cities. Use Faretrotter to plan your next trip, or purchase a ticket your next city.
There are 3 ways to travel from LBL to GEG. 4 flights, 4 trains and 1 by car are possible between the two areas. The by car from LBL to GEG is the cheapest. The flight from LBL to GEG is the fastest. The train operated by Amtrak running from GCK to SPK 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!