AirHint found the following cheapest return flights from Seattle (SEA) to San Juan (SJU) in March 2026 (see full year).
Return flights
| 11 Mar - 23 Mar | United | ||
| 24 Mar - 28 Mar | United | ||
| 25 Mar - 28 Mar | United | ||
| 23 Mar - 30 Mar | United |
Also check the deals for one-way flights from Seattle to San Juan in March.
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