Like many major cities, Montreal has a problem with vehicular traffic congestion, especially from cities in the west island such as Pointe-Claire and Beaconsfield, and off-island suburbs such as Laval on Île Jésus, and Longueuil on the south shore. The width of the Saint Lawrence River has made the construction of fixed links to the south shore expensive and difficult. There are only four road bridges along with one road tunnel, two railway bridges, and a metro line. The far narrower Rivière des Prairies, separating Montreal from Laval, is spanned by eight road bridges (six to Laval and two directly to the north shore) and a metro line.
The island of Montreal is a hub for the Quebec Autoroute system, and is served by Quebec Autoroutes A-10 (known as the Bonaventure Expressway on the island of Montreal), A-15 (aka the Decarie Expressway south of the A-40 and the Laurentian Autoroute to the north of it), A-13 (aka Chomedey Autoroute), A-20, A-25, A-40 (part of the Trans-Canada Highway system, and known as "The Metropolitan" or simply "The Met" in its elevated mid-town section), A-520, and A-720 (aka the Ville-Marie Autoroute). Many of these Autoroutes are frequently congested at rush hour. However, in recent years, the government has acknowledged this problem and is working on long-term solutions to alleviate the congestion. One such example is the extension of Quebec Autoroute 30 on Montreal's south shore, which will serve as a bypass.

Public local transport is served by a network of buses, subways, and commuter trains that extend across and off the island. The subway and bus system is operated by the Société de transport de Montréal (STM). The STM bus network consists of 165 daytime and 20 night-time service routes, and provides adapted transport and limited wheelchair-accessible buses. Montreal's Metro was inaugurated in 1966 and today has 68 stations spread out along its four lines. Each station was designed by different architects with individual themes and features original artwork, and the trains themselves run on rubber tires, making the system quieter than most. The project was initiated by Montreal Mayor Jean Drapeau, who would later bring the Summer Olympic Games to Montreal in 1976. The metro system has long had a station on the South Shore in Longueuil, and has only recently been extended to the city of Laval, north of Montreal with 3 new stations. The commuter rail system is managed and operated by the Agence métropolitaine de transport, and reaches the outlying areas of Greater Montreal. Montreal's commuter rail network had 15.7 million passengers in 2007, making it the sixth busiest in North America following New York City, Chicago, Boston, Philadelphia, and Toronto.

air:
Montreal has two international airports, one for passenger flights only, and the other for cargo. Montréal-Pierre Elliott Trudeau International Airport (also known as Dorval Airport) in the City of Dorval serves all commercial passenger traffic and is the headquarters for Air Canada and Air Transat. To the north of the city is Montréal-Mirabel International Airport in Mirabel, which was envisioned as Montreal's primary airport but which now serves cargo flights along with MEDEVACs and general aviation as well as some passenger services. In 2009, Montreal-Trudeau was the third busiest airport in Canada by passenger traffic and fourth by aircraft movements, behind Toronto Pearson, and Vancouver . In 2009 the airport handled 12.2 million passengers, and 211,999 aircraft movements. With 60.8% of its passengers being on non-domestic flights it has the largest percentage of international flights of any Canadian airport. Trudeau airport is served by 40 carriers to over 100 destinations worldwide. Airlines servicing Trudeau offer flights to Africa, Central America, the Caribbean, Europe, the United States, Mexico and other destinations within Canada. It is the only Canadian airport that offers non-stop service to Africa and it also contains the largest duty free shop in North America.

rail:
Montreal-based VIA Rail, provides rail service to other cities in Canada, particularly to Quebec City and Toronto along the Quebec City-Windsor Corridor. Amtrak, the U.S. national passenger rail system, also provides service to Montreal, operating its Adirondack daily between Montreal and New York City. All intercity trains and most commuter trains operate out of Central Station.
Canadian Pacific Railway (CPR), which is now headquartered in Calgary, Alberta, was founded here in 1881. Its corporate headquarters occupied Windsor Station at 910 Peel Street until 1995. With the Port of Montreal kept open year round by icebreakers, lines to Eastern Canada became surplus, and now Montreal is the railway's eastern and intermodal freight terminus. CPR connects at Montreal with the Port of Montreal, the Delaware & Hudson Railway to New York, the Quebec-Gatineau Railway to Quebec City and Buckingham, the Montreal, Maine & Atlantic to Halifax, and CN Rail. The CPR's flagship train, The Canadian, once ran daily from Windsor Station to Vancouver, all passenger services have since been transferred to VIA Rail Canada.
Montreal-based Canadian National Railways (CN) was formed during in 1919 by the Canadian Government following a series of country-wide rail bankruptcies. CN was formed from the lines of the Grand Trunk, Midland and Canadian Northern Railways, and has risen to become CPR's chief rival in freight carriage in Canada. Like the CPR, CN has divested itself of passenger services in favour of VIA Rail Canada.