AirHint found the following cheapest return flights from Portland (PDX) to Cancun (CUN) in March 2026 (see full year).

Return flights

06 Mar - 11 Mar	Frontier Airlines
07 Mar - 12 Mar	Frontier Airlines
02 Mar - 12 Mar	Hawaiian Airlines
01 Mar - 06 Mar	Delta
13 Mar - 18 Mar	Frontier Airlines
07 Mar - 15 Mar	Frontier Airlines
25 Mar - 31 Mar	Hawaiian Airlines
13 Mar - 16 Mar	Hawaiian Airlines
18 Mar - 23 Mar	Aeromexico
24 Mar - 30 Mar	Aeromexico
28 Mar - 04 Apr	Frontier Airlines
29 Mar - 04 Apr	Frontier Airlines
28 Mar - 05 Apr	Frontier Airlines
25 Mar - 05 Apr	Aeromexico
27 Mar - 05 Apr	Frontier Airlines

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

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 March from 290€

Return flights