AirHint found the following cheapest return flights from Portland (PDX) to San Juan (SJU) in December 2025 (see full year).
Return flights
| 05 Dec - 07 Dec | Frontier Airlines | ||
| 30 Dec - 06 Jan | Frontier Airlines | ||
| 14 Dec - 20 Dec | Frontier Airlines | ||
| 10 Dec - 16 Dec | American Airlines | ||
| 24 Dec - 31 Dec | Frontier Airlines |
Also check the deals for one-way flights from Portland to San Juan in December.
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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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