Boston to San Francisco flights (BOS → SFO)
Looking for Boston to San Francisco flights? Cheapest round-trip I’ve found: US$407 on United, non-stop, departing 2026-10-16. That’s US$4 below the typical price for this route. Cheap flights from Boston to San Francisco change daily — I re-check this route three times a day.
Deal score: Higher than usual — cheaper than 12% of prices I’ve seen on this route.
Best months to fly Boston to San Francisco
| Month | Cheapest seen |
|---|---|
| October | US$288 |
| February | US$290 |
| December | US$317 |
How to book this fare
I don’t sell tickets — I track prices and point you to where to look. To book Boston to San Francisco flights:
- Search Boston to San Francisco on Google Flights for the dates shown above (Oct 2026) — the fare I found is usually still available there.
- Compare the same dates on metasearch sites like Skyscanner or KAYAK to confirm you’re seeing the lowest price.
- Book directly with the airline when you can — it’s often the same price and makes changes or cancellations much easier.
Fares change constantly. If the price has moved, check back — I re-check this route daily.
Other Boston to … flights
- Boston to Belo Horizonte flights — US$862
- Boston to Auckland flights — US$1,185
- Boston to Santiago flights — US$651
- Boston to Rio de Janeiro flights — US$549
- Boston to Bali flights — US$1,134
- Boston to Sao Paulo flights — US$711
- Boston to Tbilisi flights — US$902
- Boston to Barcelona flights — US$587
All flights to San Francisco · All flights from Boston
Prices last checked: 2026-09-25, 6:14:28 a.m.. Prices are indicative and change quickly — confirm on the airline site before booking. See how I find these deals.