Quickest 7h 20min
There are 3 buses1 train company operating 2 routes - Empire Builder, Southwest Chief, 3 flights from Flagstaff to Fargo. The cheapest train costs $351 and is 1d 19h 47min.
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There are 4 ways to travel from Flagstaff to Fargo. 3 buses, 4 trains, 3 flights and 1 by car are possible between the two areas. The by car from Flagstaff to Fargo is the cheapest. The flight from PGA to FAR is the fastest. The train operated by Amtrak running from FLG to FAR 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!