You can take Amtrak s Adirondack Service from Central Station in Montreal to New York s Penn Station. The one way fare from Montreal to NYC will cost you $62 ($124 round trip) and the trip take about 11 hour each way.I hope this infomration is very helpful.Bonne chanceNative New Yorker
You can take Megabus from Montreal to Toronto and then from Toronto to New York. It s one of the best buses you can be on for a long trip, but that s way out of the way so probably not a great option. If you can get to Albany, you can take a Megabus from there to New York. There are also trains, but they are a lot more expensive. Megabus has power outlets and free wifi as well as really cheap prices. I ve never ridden it, but I ve taken their competitor, Bolt Bus several times and Megabus is supposed to be just as good and they have a wider map.
You can rent a bus depending on how many people you have in the past I have used the company Corporate Express, Inc. their link is below and they have provided me with charter buses that were 54 passenger if you have a smaller group i think they have 25 seater mini bus too.htttp://www.corporateexpressinc.com
i do not recommend the bus, but try greyhound or go to the actual bus station near metro berri-uqam, as for the train, theres information on either the via website or amtrak.com, or go to gare central for tickets, make sure it goes to either the port authority by bus or penn station by train.