Montreal (YUL) to Mexico City (MEX): 2,307 miles (3,712 km) great-circle, about 5h 05m nonstop by our estimate. Cheapest fare observed: $355 round-trip on United Airlines, with 2 stops, departing June 30, 2026.
$355 round-trip, United Airlines UA3414, departing 2026-06-30 at 14:20, returning 2026-08-11. The recorded itinerary left on a Tuesday, returning on a Tuesday 42 nights later; the fare was observed 66 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $355, it ranked 6th of the 30 round-trip fares we recorded from YUL (median $752). That is 15.4 cents per great-circle mile (round-trip price over one-way distance), below the YUL median of 21.8 cents across 30 round-trip routes.
Routes from YUL of similar length: Vancouver (2,288 mi) at $360 and Guatemala City (2,347 mi) at $486.
YUL to MEX is the only one of 30 YUL routes where United Airlines priced cheapest. It is the 22nd longest of the 30 routes we track from YUL.
Of 24 departure airports with a fare to Mexico City, Montreal (YUL) ranked 14th at $355. Lowest: $73 from Guadalajara (GDL); highest: $1375 from Addis Ababa (ADD); 13 nonstop. Cheapest-fare airlines (routes): Volaris (6), Viva Aerobus (5), Aeromexico (4), Arajet (2), Copa (1) and Ethiopian (1), plus 5 more.
The reverse, Mexico City (MEX) to Montreal (YMQ), was $478 round-trip on United Airlines, 2 stops, departing May 1, 2026. Mexico City to Montreal flights.
That depends on your passport and trip, so check the official source for Mexico: Instituto Nacional de Migracion (Mexico). Connecting elsewhere? Check that country's transit rules too.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/Toronto, America/Mexico_City; flight time is our estimate.