BOS to SJO from $376 in economy

UAUnited Airlines

Round Trip•Economy

BOS

Logan International Airport

Boston, United States

SJO

Juan Santamaría International Airport (SJO)

San José, Costa Rica

$628 USD

-40%$376 USD

Verified 14 days ago

September 2026

Today

Mon

Tue

Wed

Thu

Fri

Sat

Sun

31$406 1$406 2$381 3$413 4$405 5$381 6$381 7$454 8$381 9$381 10$381 11$381 12$381 13$424 14$381 15$376 16$376 17$386 18$490 19$429 20$504 21$412 22$376 23$417 24$376 25$376 26$376 27$478 28$376 29$376 30$417 1$386 2$376 3$400 4$376

Fair Availability

20% of dates checked are available within 10% of the lowest price

Thursday, September 3rd, 2026

7 round-trip options

Returning

Tue, Sep 8, 2026•5 Day Trip

$459 USD

Google Flights

Returning

Wed, Sep 9, 2026•6 Day Trip

$552 USD

Google Flights

Returning

Fri, Sep 11, 2026•8 Day Trip

$443 USD

Google Flights

Returning

Sun, Sep 13, 2026•10 Day Trip

$474 USD

Google Flights

Returning

Mon, Sep 14, 2026•11 Day Trip

$413 USD

Google Flights

Returning

Tue, Sep 15, 2026•12 Day Trip

$454 USD

Google Flights

Returning

Wed, Sep 16, 2026•13 Day Trip

$413 USD

Google Flights

Boston (BOS) to San José (SJO) flight deal in economy from $376

Logan International Airport

Juan Santamaría International Airport (SJO)

September 2026

Thursday, September 3rd, 2026