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

Return flights

22 Aug - 05 Sep	United
27 Aug - 06 Sep	United
26 Aug - 09 Sep	United
31 Aug - 04 Sep	United
22 Aug - 07 Sep	United
20 Aug - 07 Sep	United
31 Aug - 07 Sep	United
14 Aug - 07 Sep	United
11 Aug - 18 Aug	Arajet
27 Aug - 06 Sep	Air Transat	direct
30 Aug - 06 Sep	Air Transat	direct
20 Aug - 24 Aug	Aeromexico
20 Aug - 27 Aug	Aeromexico
07 Aug - 13 Aug	WestJet
04 Aug - 11 Aug	Arajet
07 Aug - 10 Aug	WestJet
05 Aug - 13 Aug	WestJet
13 Aug - 19 Aug	United
13 Aug - 25 Aug	Aeromexico
13 Aug - 20 Aug	Aeromexico

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.

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Cheapest return flights from Montreal to Cancun in August from $313

Return flights