AirHint found the following cheapest return flights from Seattle (SEA) to San Juan (SJU) in January 2026 (see full year).
Return flights
| 22 Jan - 29 Jan | Frontier Airlines | ||
| 27 Jan - 03 Feb | Alaska Airlines | ||
| 22 Jan - 25 Jan | Frontier Airlines | ||
| 20 Jan - 29 Jan | Delta |
Also check the deals for one-way flights from Seattle to San Juan in January.
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