Montreal (YUL) to Cancun (CUN): 1,845 miles (2,969 km) great-circle, about 4h 10m nonstop by our estimate. Cheapest fare observed: $518 round-trip on WestJet, with 1 stop, departing May 13, 2026.
$518 round-trip, WestJet WS859, departing 2026-05-13 at 06:45, returning 2026-05-18. The recorded itinerary left on a Wednesday, returning on a Monday 5 nights later; the fare was observed 18 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $518, it ranked 11th of the 30 round-trip fares we recorded from YUL (median $752). That is 28.1 cents per great-circle mile (round-trip price over one-way distance), above the YUL median of 21.8 cents across 30 round-trip routes.
Routes from YUL of similar length: Punta Cana (1,884 mi) at $510 and Havana (1,628 mi) at $435.
WestJet had the cheapest fare on 7 of 30 YUL routes. It is the 25th longest of the 30 routes we track from YUL.
Of 25 departure airports with a fare to Cancun, Montreal (YUL) ranked 20th at $518. Lowest: $127 from Mexico City (MEX); highest: $2060 from Perth (PER); 4 nonstop. Cheapest-fare airlines (routes): Frontier (6), Aeromexico (4), Air Canada (3), American Airlines (2), Viva Aerobus (2) and AirAsia (1), plus 7 more.
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/Cancun; flight time is our estimate.