Cheapest return flights from Seattle to San Juan in August from 338€

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

Return flights

24 Aug - 04 Sep United
30 Aug - 06 Sep United
18 Aug - 22 Aug Alaska Airlines
01 Aug - 15 Aug United
18 Aug - 25 Aug Alaska Airlines
22 Aug - 26 Aug United
23 Aug - 26 Aug Alaska Airlines
24 Aug - 28 Aug Southwest Airlines
28 Aug - 03 Sep Alaska Airlines
28 Aug - 31 Aug Alaska Airlines

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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