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

Return flights

19 Sep - 27 Sep	SWISS
14 Sep - 22 Sep	Air Canada
07 Sep - 22 Sep	Air Canada
04 Sep - 15 Sep	Air Canada
22 Sep - 29 Sep	United
08 Sep - 15 Sep	United
15 Sep - 22 Sep	United
16 Sep - 23 Sep	United
04 Sep - 10 Sep	Air Canada
21 Sep - 28 Sep	Air Canada
16 Sep - 14 Oct	United
16 Sep - 01 Oct	United
25 Sep - 03 Oct	Air Europa
30 Sep - 07 Oct	British Airways

Also check the deals for one-way flights from Porto to Cancun in September.

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 September from $550

Return flights