All deals

Cheap Flights from Boston to San Francisco

Every verified deal from Boston to San Francisco, ranked by how far the fare falls below its route baseline. Prices are checked against live availability.

Boston → San Francisco

$266 $0.05/mi

Alaska · Economy · Oct 31 – Nov 7 (7n)

On the board right now

Cabin mix: 1 Economy.
Best discount right now: 53% below the route baseline.
Most active airlines: Alaska.
1 deal first seen in the last 24 hours.

Price history: Boston to San Francisco

Lowest observed fare on this corridor over the past year, from our signals database.

$299 — seen Jul 2026
$299 — seen Aug 2026
$299 — seen Aug 2026
$299 — seen Aug 2026
$249 — seen Aug 2026
$238 — seen Aug 2026
$198 — seen Aug 2026
$178 — seen Aug 2026
$178 — seen Aug 2026
$176 — seen Aug 2026 (4 observations)
$228 — seen Aug 2026 (2 observations)
$159 — seen Aug 2026 (17 observations)
$277 — seen Aug 2026 (8 observations)
$348 — seen Aug 2026 (6 observations)
$277 — seen Aug 2026 (2 observations)
$159 — seen Aug 2026 (6 observations)
$178 — seen Aug 2026
$178 — seen Aug 2026
$159 — seen Aug 2026 (16 observations)
$178 — seen Aug 2026 (2 observations)
$277 — seen Aug 2026 (3 observations)
$277 — seen Aug 2026 (6 observations)
$159 — seen Aug 2026 (15 observations)
$178 — seen Aug 2026 (3 observations)
$283 — seen Aug 2026
$277 — seen Aug 2026 (2 observations)
$159 — seen Aug 2026 (4 observations)
$178 — seen Aug 2026
$178 — seen Aug 2026
$277 — seen Aug 2026 (2 observations)
$398 — seen Aug 2026
$417 — seen Aug 2026
$178 — seen Aug 2026
$178 — seen Aug 2026
$277 — seen Aug 2026
$159 — seen Aug 2026 (5 observations)
$302 — seen Aug 2026 (4 observations)
$228 — seen Aug 2026
$159 — seen Aug 2026 (21 observations)
$357 — seen Aug 2026
$198 — seen Aug 2026
$198 — seen Aug 2026
$218 — seen Aug 2026
$218 — seen Aug 2026
$159 — seen Aug 2026 (3 observations)
$187 — seen Aug 2026 (5 observations)
$285 — seen Aug 2026
$353 — seen Aug 2026
$285 — seen Aug 2026 (4 observations)
$254 — seen Aug 2026
$285 — seen Aug 2026 (3 observations)
$304 — seen Aug 2026
$260 — seen Aug 2026
$360 — seen Aug 2026 (4 observations)
$360 — seen Aug 2026 (14 observations)
$260 — seen Aug 2026
$280 — seen Aug 2026 (2 observations)
$280 — seen Aug 2026 (2 observations)
$280 — seen Aug 2026
$280 — seen Aug 2026 (2 observations)
$349 — seen Aug 2026
$349 — seen Aug 2026 (4 observations)
$338 — seen Aug 2026 (5 observations)
$357 — seen Aug 2026
$280 — seen Aug 2026
$338 — seen Aug 2026 (4 observations)
$338 — seen Aug 2026 (7 observations)
$299 — seen Aug 2026
$338 — seen Sep 2026 (3 observations)
$346 — seen Sep 2026
$329 — seen Sep 2026
$309 — seen Sep 2026
$310 — seen Sep 2026
$304 — seen Sep 2026
$310 — seen Sep 2026 (4 observations)
$310 — seen Sep 2026 (3 observations)
$508 — seen Sep 2026 (5 observations)
$304 — seen Sep 2026
$508 — seen Sep 2026 (4 observations)
$508 — seen Sep 2026 (6 observations)
$508 — seen Sep 2026 (10 observations)
$294 — seen Sep 2026
$508 — seen Sep 2026 (10 observations)
$508 — seen Sep 2026 (5 observations)
$508 — seen Sep 2026 (5 observations)
$354 — seen Sep 2026 (8 observations)
$354 — seen Sep 2026
$289 — seen Sep 2026
$354 — seen Sep 2026 (8 observations)
$354 — seen Sep 2026 (8 observations)
$354 — seen Sep 2026 (6 observations)
$289 — seen Sep 2026
$354 — seen Sep 2026 (14 observations)
$354 — seen Sep 2026 (7 observations)
$336 — seen Sep 2026
$310 — seen Sep 2026
$619 — seen Sep 2026 (4 observations)
$576 — seen Sep 2026 (2 observations)
$310 — seen Sep 2026
$342 — seen Sep 2026 (3 observations)
$342 — seen Sep 2026 (4 observations)
$320 — seen Sep 2026
$342 — seen Sep 2026 (3 observations)
$320 — seen Sep 2026
$342 — seen Sep 2026 (4 observations)
$320 — seen Sep 2026
$365 — seen Sep 2026 (4 observations)
$314 — seen Sep 2026
$365 — seen Sep 2026 (4 observations)
$314 — seen Sep 2026
$365 — seen Sep 2026 (4 observations)
$314 — seen Sep 2026
$365 — seen Sep 2026 (2 observations)
$314 — seen Sep 2026
$401 — seen Sep 2026 (8 observations)
$401 — seen Sep 2026 (4 observations)
$401 — seen Sep 2026 (4 observations)
$401 — seen Oct 2026 (3 observations)
$429 — seen Oct 2026
$429 — seen Oct 2026
$346 — seen Oct 2026 (8 observations)
$346 — seen Oct 2026 (5 observations)
$346 — seen Oct 2026 (4 observations)
$324 — seen Oct 2026
$346 — seen Oct 2026
$167 — seen Oct 2026
$305 — seen Oct 2026 (2 observations)
$305 — seen Oct 2026 (4 observations)
$266 — seen Oct 2026
$267 — seen Oct 2026

Frequently asked questions

How many flight deals from Boston to San Francisco are on Sparkflights right now?

There are 1 verified deals from Boston to San Francisco on the board right now. The list refreshes hourly.

What is the cheapest flight from Boston to San Francisco right now?

The lowest verified fare from Boston to San Francisco right now is $266. Prices are checked against live availability before listing.

What is the lowest price ever seen from Boston to San Francisco?

The lowest fare we've recorded from Boston to San Francisco is $159, based on 130 price observations over the past year.

Which airlines fly Boston to San Francisco?

Airlines with the most deals from Boston to San Francisco right now are Alaska.