Cheap flights from Boston to San Francisco
From 233 USD — compare hundreds of airlines
Direct flightsCheapest: 2026-07 · 118 US$
Prices by date
342 US$
05/07
282 US$
06/07
216 US$
07/07
216 US$
08/07
216 US$
09/07
150 US$
10/07
152 US$
11/07
152 US$
12/07
152 US$
13/07
152 US$
14/07
155 US$
15/07
138 US$
16/07
Airlines on this route
FAQ
What's the cheapest month to fly Boston to San Francisco?
Usually 2026-07, from 118 USD.
Are there direct flights from Boston to San Francisco?
We show both direct and connecting options — filter to compare.