AirHint found the following cheapest return flights from Portland (PDX) to San Juan (SJU) in January 2026 (see full year).
Return flights
| 23 Jan - 01 Feb | Frontier Airlines | ||
| 14 Jan - 18 Jan | Delta | ||
| 02 Jan - 09 Jan | United |
Also check the deals for one-way flights from Portland to San Juan in January.
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