AirHint found the following cheapest return flights from Portland (PDX) to San Juan (SJU) in September 2026 (see full year).
Return flights
| 25 Sep - 08 Oct | Southwest Airlines | ||
| 23 Sep - 08 Oct | Southwest Airlines | ||
| 24 Sep - 08 Oct | Southwest Airlines | ||
| 23 Sep - 07 Oct | United | ||
| 22 Sep - 07 Oct | United |
Also check the deals for one-way flights from Portland to San Juan in September.
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