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

Return flights

30 Jul - 06 Aug	United
29 Jul - 06 Aug	Spirit Airlines
29 Jul - 10 Aug	Spirit Airlines
29 Jul - 07 Aug	Spirit Airlines
29 Jul - 04 Aug	Spirit Airlines
30 Jul - 02 Aug	Spirit Airlines
30 Jul - 10 Aug	Spirit Airlines
28 Jul - 06 Aug	Spirit Airlines
28 Jul - 02 Aug	Spirit Airlines
30 Jul - 07 Aug	Spirit Airlines
29 Jul - 31 Jul	Spirit Airlines
30 Jul - 31 Jul	Spirit Airlines
28 Jul - 31 Jul	Spirit Airlines
27 Jul - 31 Jul	Spirit Airlines
27 Jul - 29 Jul	Spirit Airlines

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

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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Cheapest return flights from Seattle to San Juan in July from 598€

Return flights