AirHint found the following cheapest return flights from Portland (PDX) to Cancun (CUN) in December 2025 (see full year).

Return flights

05 Dec - 13 Dec	Alaska Airlines
14 Dec - 11 Jan	Alaska Airlines
29 Dec - 05 Jan	Alaska Airlines
09 Dec - 05 Jan	Aeromexico
28 Dec - 05 Jan	Alaska Airlines
21 Dec - 31 Dec	Sun Country Airlines
30 Dec - 04 Jan	Volaris
20 Dec - 31 Dec	Sun Country Airlines
27 Dec - 02 Jan	Air Canada

Also check the deals for one-way flights from Portland to Cancun in December.

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 Portland to Cancun in December from $333

Return flights