Boise (BOI) to San José (SJO) flight deal from $298 USD in economy class

UAUnited Airlines

Round Trip•Economy

BOI

Boise Air Terminal (Gowen Field)

Boise, United States

SJO

Juan Santamaría International Airport (SJO)

San José, Costa Rica

$558 USD

-47%$298 USD

Verified Nov 25, 2025 at 10:14 PM

December 2025

Today

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1$328 2$401 3$316 4$320 5$298 6$298 7$298 8$298 9$298 10$366 11$333 12$298 13$455 14$463 15$474 16$537 17$495 18$658 19$745 20$807 21$944 22$819 23$944 24$801 25$1,126 26$1,245 27$1,136 28$873 29$740 30$602 31$418 1 2 3 4

Limited Availability

16% of dates checked are available within 10% of the lowest price

Monday, December 29th, 2025

10 round-trip options

Returning

Sat, Jan 3, 2026•5 Day Trip

$1,577 USD

Google Flights

Returning

Sun, Jan 4, 2026•6 Day Trip

$1,483 USD

Google Flights

Returning

Mon, Jan 5, 2026•7 Day Trip

$1,229 USD

Google Flights

Returning

Tue, Jan 6, 2026•8 Day Trip

$1,084 USD

Google Flights

Returning

Wed, Jan 7, 2026•9 Day Trip

$899 USD

Google Flights

Returning

Thu, Jan 8, 2026•10 Day Trip

$893 USD

Google Flights

Returning

Fri, Jan 9, 2026•11 Day Trip

$886 USD

Google Flights

Returning

Sat, Jan 10, 2026•12 Day Trip

$951 USD

Google Flights

Returning

Sun, Jan 11, 2026•13 Day Trip

$894 USD

Google Flights

Returning

Mon, Jan 12, 2026•14 Day Trip

$740 USD

Google Flights