Cheapest return flights from Seattle to San Juan in January from $234

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

Return flights

06 Jan - 22 Jan Frontier Airlines
10 Jan - 15 Jan Frontier Airlines
20 Jan - 29 Jan American Airlines
27 Jan - 03 Feb American Airlines
22 Jan - 25 Jan Frontier Airlines
29 Jan - 02 Feb Alaska Airlines
15 Jan - 20 Jan Frontier Airlines
14 Jan - 18 Jan American Airlines
16 Jan - 19 Jan Alaska Airlines

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

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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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