BOS to SFO from $245 in economy

UAUnited Airlines

Round Trip•Economy

BOS

Logan International Airport

Boston, United States

SFO

San Francisco International Airport

San Francisco, United States

$409 USD

-40%$245 USD

Verified 14 days ago

July 2026

Today

Mon

Tue

Wed

Thu

Fri

Sat

Sun

29 30 1 2 3 4 5$552 6$552 7$517 8$507 9$507 10$507 11$507 12$457 13$457 14$426 15$426 16$426 17$426 18$426 19$276 20$332 21$286 22$276 23$276 24$326 25$348 26$401 27$317 28$296 29$296 30$289 31$296 1$327 2$502

Extremely Rare Availability

2% of dates checked are available within 10% of the lowest price

Monday, July 20th, 2026

7 round-trip options

Returning

Sun, Jul 26, 2026•6 Day Trip

$403 USD

Google Flights

Returning

Tue, Jul 28, 2026•8 Day Trip

$332 USD

Google Flights

Returning

Wed, Jul 29, 2026•9 Day Trip

$332 USD

Google Flights

Returning

Thu, Jul 30, 2026•10 Day Trip

$363 USD

Google Flights

Returning

Fri, Jul 31, 2026•11 Day Trip

$383 USD

Google Flights

Returning

Sun, Aug 2, 2026•13 Day Trip

$363 USD

Google Flights

Returning

Mon, Aug 3, 2026•14 Day Trip

$363 USD

Google Flights

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

Logan International Airport

San Francisco International Airport

July 2026

Monday, July 20th, 2026