Cheapest return flights from Seattle to San Juan in October from $329

AirHint found the following cheapest return flights from Seattle (SEA) to San Juan (SJU) in October 2025 (see full year).

Return flights

03 Oct - 07 Oct Alaska Airlines
24 Oct - 27 Oct American Airlines
16 Oct - 27 Oct American Airlines
08 Oct - 13 Oct Frontier Airlines
09 Oct - 13 Oct Frontier Airlines
16 Oct - 26 Oct American Airlines
02 Oct - 05 Oct United

Also check the deals for one-way flights from Seattle to San Juan in October.

Skyscanner

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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