Montreal Trudeau YUL: the complete layover guide

Montreal Trudeau, officially Pierre Elliott Trudeau International Airport, is a single terminal split into three watertight compartments: domestic Canada, international, and a transborder zone for the United States.

The building reads as one long concourse. Domestic gates sit at one end, international gates 50 to 68 occupy the international jetty, and the transborder gates fill the far end past US preclearance. Landside, you can walk the whole public level in about 10 minutes. Airside is a different story, because the three zones do not connect to each other. There is no airside bus, no transit corridor, no shortcut. If your connection changes zones, you pass through an immigration or security control to do it, and that control is where your layover time goes.

The transborder zone deserves its own paragraph because it confuses more travelers than anything else here. Every flight from YUL to the United States goes through US preclearance: you present yourself to US Customs and Border Protection officers in Montreal, before boarding. You answer the questions, your bags are screened to US standards, and when you land in the US you walk off the plane as a domestic arrival, no further checks. The catch is the front loading. The airport tells passengers to arrive 3 hours before a US departure, and queues at preclearance swing hard with the morning and late afternoon banks. Once you are through, you cannot wander back to the rest of the airport for a better lounge or a forgotten meal. Buy your water, eat your lunch, then cross.

Connections in plain numbers: same zone connections at YUL are usually relaxed, and international to international works on a 1 hour connection when your inbound is on time. International to US is the hard one, because you clear Canadian border formalities, change zones, then queue for US preclearance; treat 2 hours as the floor and 3 as comfortable. On separate tickets, give yourself 3 hours minimum whatever the routing. Arriving from abroad, Canadian passport control uses self serve kiosks and moves reasonably well outside the early afternoon arrival bank.

Getting downtown is currently a road trip. The 747 bus runs around the clock between the airport and downtown Montreal; the fare is 11.25 Canadian dollars and doubles as a 24 hour pass on the city transit network. Budget 45 to 70 minutes each way depending on traffic. The REM light rail will eventually fix this: an airport station is under construction, and the operator expects this segment to enter service in 2027, with a ride of roughly 25 minutes to Central Station once it opens. Until that day, exact REM fares and timings from the airport are to be confirmed, and the bus is the transit answer. If you meet Canadian entry requirements, a 6 hour layover is enough for Old Montreal and a proper meal; verify before travel, since entry rules depend on your nationality and may require an eTA or visa.