AirHint found the following cheapest return flights from Montreal (YUL) to Cancun (CUN) in August 2025 (see full year).

Return flights

28 Aug - 09 Sep	United
28 Aug - 05 Sep	United
31 Aug - 05 Sep	United
28 Aug - 04 Sep	Air Transat
28 Aug - 14 Sep	Air Transat
28 Aug - 07 Sep	Air Transat
28 Aug - 06 Sep	Air Transat
31 Aug - 21 Sep	Air Canada
31 Aug - 03 Sep	United
30 Aug - 08 Sep	Air Transat
29 Aug - 30 Aug	Air Transat
28 Aug - 28 Aug	Air Canada
28 Aug - 29 Aug	Air Transat
29 Aug - 31 Aug	Air Transat
28 Aug - 31 Aug	Copa
28 Aug - 29 Aug	Air Canada	direct
29 Aug - 30 Aug	Air Transat	direct
29 Aug - 31 Aug	Air Transat	direct

Also check the deals for one-way flights from Montreal to Cancun in August.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

Book a cheap hotel in Cancun

Cheap car rent in Cancun

Cheapest return flights from Montreal to Cancun in August from $349

Return flights