Cheapest return SEA–SJU flights, July

AirHint found the following cheapest return flights from Seattle (SEA) to San Juan (SJU) in July 2026 (see full year).

Return flights

30 Jul - 02 Aug Southwest Airlines
15 Jul - 05 Aug Southwest Airlines
24 Jul - 03 Aug Frontier Airlines
01 Jul - 12 Jul Frontier Airlines
20 Jul - 28 Jul Frontier Airlines
25 Jul - 03 Aug Frontier Airlines
25 Jul - 02 Aug Southwest Airlines
01 Jul - 14 Jul Frontier Airlines
19 Jul - 25 Jul Frontier Airlines
26 Jul - 01 Aug Frontier Airlines
25 Jul - 01 Aug Frontier Airlines
06 Jul - 12 Jul Frontier Airlines
28 Jul - 04 Aug Southwest Airlines
01 Jul - 10 Jul Southwest Airlines

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

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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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