SFO to BOS from $245 in economy

UAUnited Airlines

Round Trip•Economy

SFO

San Francisco International Airport

San Francisco, United States

BOS

Logan International Airport

Boston, United States

$424 USD

-42%$245 USD

Verified 14 days ago

December 2026

Today

Mon

Tue

Wed

Thu

Fri

Sat

Sun

30$474 1$397 2$397 3$397 4$397 5$397 6$397 7$397 8$397 9$397 10$397 11$397 12$427 13$427 14$397 15$427 16$427 17$588 18$645 19$721 20$560 21$524 22$547 23$580 24$397 25$397 26$397 27$397 28$397 29$397 30$397 31$397 1$407 2$625 3$473

Extremely Rare Availability

1% of dates checked are available within 10% of the lowest price

Friday, December 18th, 2026

6 round-trip options

Returning

Wed, Dec 23, 2026•5 Day Trip

$858 USD

Google Flights

Returning

Sun, Dec 27, 2026•9 Day Trip

$932 USD

Google Flights

Returning

Tue, Dec 29, 2026•11 Day Trip

$751 USD

Google Flights

Returning

Wed, Dec 30, 2026•12 Day Trip

$645 USD

Google Flights

Returning

Thu, Dec 31, 2026•13 Day Trip

$645 USD

Google Flights

Returning

Fri, Jan 1, 2027•14 Day Trip

$757 USD

Google Flights

San Francisco (SFO) to Boston (BOS) flight deal in economy from $245

San Francisco International Airport

Logan International Airport

December 2026

Friday, December 18th, 2026