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

Return flights

26 Aug - 04 Sep	United
26 Aug - 12 Sep	United
23 Aug - 06 Sep	United
26 Aug - 27 Aug	Air Transat
26 Aug - 03 Sep	Air Transat
26 Aug - 02 Sep	Air Transat
27 Aug - 03 Sep	Air Transat
31 Aug - 07 Sep	Aeromexico
26 Aug - 12 Sep	Air Transat	direct
22 Aug - 27 Aug	Air Transat
30 Aug - 03 Sep	Air Transat
30 Aug - 13 Sep	Air Transat
19 Aug - 27 Aug	WestJet
20 Aug - 27 Aug	Air Canada
21 Aug - 27 Aug	Air Transat
24 Aug - 27 Aug	Avianca
19 Aug - 28 Aug	WestJet
19 Aug - 29 Aug	WestJet
22 Aug - 29 Aug	Arajet
21 Aug - 29 Aug	Air Transat

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 310€

Return flights