Quickest 5h 49min
There are 1 train company operating 2 routes - Silver Star, Adirondack from Montreal to Washington, D.C.. The cheapest train costs $113 and is 12h 16min.
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There are 4 ways to travel from Montreal to Washington, D.C.. 4 buses, 4 trains, 4 flights and 1 by car are possible between the two areas. The by car from Montreal to Washington, D.C. is the cheapest. The flight from PBG to DCA is the fastest. The train operated by Amtrak running from MTR to WAS 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!