Cheapest return flights from Seattle to San Juan in March from 309€

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

Return flights

03 Mar - 10 Mar Frontier Airlines
04 Mar - 11 Mar United
02 Mar - 07 Mar Frontier Airlines
25 Mar - 31 Mar Frontier Airlines
10 Mar - 24 Mar Frontier Airlines
19 Mar - 24 Mar Alaska Airlines
23 Mar - 30 Mar Frontier Airlines
18 Mar - 23 Mar Alaska Airlines
26 Mar - 31 Mar Frontier Airlines
25 Mar - 29 Mar Frontier Airlines

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

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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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