Cheapest return flights from Seattle to San Juan in March from $337

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

Return flights

02 Mar - 12 Mar Frontier Airlines
21 Mar - 25 Mar American Airlines
28 Mar - 01 Apr American Airlines
29 Mar - 03 Apr American Airlines
23 Mar - 27 Mar American Airlines
27 Mar - 02 Apr American Airlines
05 Mar - 14 Mar Frontier Airlines
15 Mar - 21 Mar Frontier Airlines
25 Mar - 30 Mar Alaska Airlines
14 Mar - 22 Mar Frontier Airlines
26 Mar - 30 Mar Alaska Airlines
25 Mar - 29 Mar Alaska Airlines
26 Mar - 29 Mar Alaska Airlines

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

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