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

Return flights

31 Aug - 14 Sep	Air Canada
31 Aug - 07 Sep	Air Canada
28 Aug - 06 Sep	United
27 Aug - 10 Sep	Air Europa
26 Aug - 09 Sep	United
26 Aug - 06 Sep	United
29 Aug - 11 Sep	United
30 Aug - 06 Sep	United
27 Aug - 31 Aug	Air Europa
25 Aug - 26 Aug	Air Europa
21 Aug - 27 Aug	TAP
20 Aug - 27 Aug	TAP
23 Aug - 31 Aug	Vueling Airlines
18 Aug - 24 Aug	TAP
18 Aug - 27 Aug	TAP
20 Aug - 28 Aug	TAP
21 Aug - 28 Aug	TAP
19 Aug - 28 Aug	TAP

Also check the deals for one-way flights from Porto 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 Porto to Cancun in August from $654

Return flights