Cheapest return flights from Seattle to San Juan in August from $433

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

Return flights

29 Aug - 03 Sep United
02 Aug - 08 Aug Spirit Airlines
08 Aug - 11 Aug Spirit Airlines
02 Aug - 11 Aug Spirit Airlines
29 Aug - 07 Sep United
02 Aug - 07 Aug Spirit Airlines
28 Aug - 03 Sep United
02 Aug - 03 Aug Spirit Airlines
27 Aug - 01 Sep American Airlines
18 Aug - 25 Aug United
01 Aug - 15 Aug United
28 Aug - 31 Aug United

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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