AirHint found the following cheapest return flights from Portland (PDX) to Cancun (CUN) in May 2026 (see full year).
Return flights
| 07 May - 11 May | Frontier Airlines | ||
| 16 May - 23 May | United | ||
| 20 May - 30 May | United |
Also check the deals for one-way flights from Portland to Cancun in May.
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