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

Return flights

09 Dec - 12 Dec	Alaska Airlines
03 Dec - 10 Dec	American Airlines
08 Dec - 16 Dec	Delta
11 Dec - 15 Dec	Frontier Airlines
08 Dec - 15 Dec	Hawaiian Airlines
20 Dec - 22 Dec	Aeromexico
12 Dec - 17 Dec	Hawaiian Airlines
11 Dec - 14 Dec	Hawaiian Airlines
16 Dec - 16 Dec	Hawaiian Airlines
15 Dec - 22 Dec	Hawaiian Airlines
15 Dec - 05 Jan	Hawaiian Airlines
10 Dec - 02 Jan	Hawaiian Airlines
17 Dec - 08 Jan	Hawaiian Airlines
16 Dec - 03 Jan	Alaska Airlines
11 Dec - 02 Jan	Hawaiian Airlines
17 Dec - 02 Jan	Hawaiian Airlines
21 Dec - 03 Jan	American Airlines

Also check the deals for one-way flights from Portland to Mexico City 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.

Book a cheap hotel in Mexico City

Cheap car rent in Mexico City

Cheapest return flights from Portland to Mexico City in December from $376

Return flights