Amtrak will cost you $73. You would take a Northeast Regional train from Union Station to Penn Station in New York, and then transfer to Amtrak s Adirondack, which goes from New York to Montreal.The train is definitely more comfortable than the bus.It would require, though, that you catch the 4:00am train out of Washington Union Station.Here s a link to Amtrak s website. You re going from WAS to MTR . You can purchase a single ticket for the trip. Note that there is a stop at the border crossing where passports and such are checked.http://www.amtrak.com
Greyhound one way is 104.55 US bought on internet for immediate travel Maybe if you went to the station and bought a 7 day in advance it might be cheaper.U.S. Airways is $US326.00 one way.AMTRAC is more.
cheapest is bus.