Cheapest return flights from Seattle to San Juan in August from $435

Best time to book flights for Seattle (SEA) to San Juan (SJU) flights at AirHint

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

Return flights

01 Aug - 15 Aug Southwest Airlines
08 Aug - 13 Aug Southwest Airlines
30 Aug - 06 Sep United
30 Aug - 02 Sep Southwest Airlines
30 Aug - 01 Sep Delta
28 Aug - 01 Sep Southwest Airlines
28 Aug - 03 Sep Delta

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

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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