Cheapest return SEA–SJU flights, June

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

Return flights

01 Jun - 07 Jun Frontier Airlines
01 Jun - 09 Jun Frontier Airlines
10 Jun - 15 Jun Frontier Airlines
14 Jun - 18 Jun Frontier Airlines
24 Jun - 29 Jun Frontier Airlines
18 Jun - 25 Jun Frontier Airlines
19 Jun - 22 Jun Frontier Airlines
12 Jun - 14 Jun Frontier Airlines
18 Jun - 22 Jun Frontier Airlines
24 Jun - 28 Jun Frontier Airlines
30 Jun - 05 Jul Frontier Airlines

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

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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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