San Francisco (SFO) to Boston (BOS) flight deal from $217 USD in economy class

UAUnited Airlines

Round Trip•Economy

SFO

San Francisco International Airport

San Francisco, United States

BOS

Logan International Airport

Boston, United States

$339 USD

-36%$217 USD

Verified Nov 5, 2025 at 2:12 AM

December 2025

Today

Mon

Tue

Wed

Thu

Fri

Sat

Sun

1$237 2$217 3$217 4$227 5$227 6$217 7$227 8$227 9$227 10$227 11$237 12$267 13$257 14$267 15$267 16$257 17$267 18$282 19$475 20$299 21$311 22$343 23$251 24$227 25$234 26$328 27$245 28$255 29$245 30$227 31$257 1 2 3 4

Limited Availability

12% of dates checked are available within 10% of the lowest price

Thursday, December 18th, 2025

10 round-trip options

Returning

Tue, Dec 23, 2025•5 Day Trip

$380 USD

Google Flights

Returning

Wed, Dec 24, 2025•6 Day Trip

$282 USD

Google Flights

Returning

Thu, Dec 25, 2025•7 Day Trip

$296 USD

Google Flights

Returning

Fri, Dec 26, 2025•8 Day Trip

$489 USD

Google Flights

Returning

Sat, Dec 27, 2025•9 Day Trip

$384 USD

Google Flights

Returning

Sun, Dec 28, 2025•10 Day Trip

$632 USD

Google Flights

Returning

Mon, Dec 29, 2025•11 Day Trip

$306 USD

Google Flights

Returning

Tue, Dec 30, 2025•12 Day Trip

$405 USD

Google Flights

Returning

Wed, Dec 31, 2025•13 Day Trip

$384 USD

Google Flights

Returning

Thu, Jan 1, 2026•14 Day Trip

$342 USD

Google Flights