Boston to San Francisco flights
The cheapest round trip we found from Boston to San Francisco is $318 (Dec 4 – 7, 1 stop).
BOS to SFO · Round trip · Economy · Prices per person in USD · Price found (2 days ago)
Cheapest found
Cheapest round trip by month
Lowest fare found per departure month| Month | Cheapest round trip |
|---|---|
| November 2026 | $459 |
| December 2026 | $318 (cheapest month) |
Cheapest dates in the next 4 months
Round trip, per person-
Dec 4 – 7 3 nights · leave Fri$318$318 Book
Alaska Airlines 1 stop · 8h 26m -
Nov 19 – 30 11 nights · leave Thu$572$572 Book
Alaska Airlines 1 stop · 8h 06m
-
Nov 25 – 28 3 nights · leave Wed$677$677 Book
Southwest Airlines 1 stop · 7h 25m
Prices change often. The booking site shows the final price before you pay. Other dates? Set an alert
Things to do in San Francisco
One Go City pass for Golden Gate Bay Cruise, Exploratorium, Filoli and more
- All-Inclusive Pass Unlimited Visit as many attractions as you like for 1–5 days from $109 See pass
- Explorer Pass Pick 2–5 of 25 attractions from $89 See pass
- Essentials Pass A few top attractions, chosen as you go from $74 See pass
Go City prices checked Oct 23, 2026; the final price is on Go City. Partner links: we may earn a commission if you book, at no extra cost to you.
Plan the rest of your trip
San Francisco · Dec 4 – 7Partner links: we may earn a commission if you book, at no extra cost to you.
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Flights to San Francisco from other cities
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Boston to San Francisco: questions
How much does a flight from Boston to San Francisco cost?
The cheapest round trip we have found right now is $318, leaving December 4 and returning December 7. Prices are per person, economy, in USD.
Which airports do Boston to San Francisco flights use?
Boston airports include Logan International (BOS) and Pease Air Force Base (PSM). San Francisco airports include San Francisco International (SFO). The prices on this page cover every airport in both cities (BOS and SFO are the city codes).
About this route
We track round-trip economy fares from Boston (United States) to San Francisco (United States) using Travelpayouts / Aviasales data. The cheapest round trip we've found is $318, departing December 4 and returning December 7. The cheapest month to fly in our data is December, from $318. Prices are per person and were correct when found; the final price is set by the airline or booking site when you book.