AirHint found the following cheapest return flights from Seattle (SEA) to San Juan (SJU) in May 2026 (see full year).
Return flights
| 01 May - 07 May | Delta | ||
| 07 May - 13 May | United | ||
| 20 May - 30 May | Alaska Airlines |
Also check the deals for one-way flights from Seattle to San Juan in May.
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