Cheapest one-way SEA–SJO flights, June

AirHint found the following cheapest one-way flights from Seattle (SEA) to San Jose (SJO) in June 2026 (see full year).

One-Way flights

20 Jun Southwest Airlines

Also check the deals for return flights from Seattle to San Jose 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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