Cheapest return flights from Seattle to San Juan in September from 320€

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

Return flights

20 Sep - 27 Sep United
17 Sep - 21 Sep United
18 Sep - 21 Sep United
24 Sep - 28 Sep United
25 Sep - 28 Sep United
02 Sep - 06 Sep United
26 Sep - 29 Sep United
10 Sep - 15 Sep Alaska Airlines

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

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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