Cheap flights from Boston to San Francisco
Live fares + phone-only deals on the BOS → SFO route. Book in five minutes by phone.
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Call 1 (815) 473-8090Key facts
- Origin airport: BOS
- Destination airport: SFO
- Best book-ahead window: 6–10 weeks for domestic, 3–6 months for international
- Cheapest weekdays to fly: Tuesday and Wednesday
- Phone-only fares typically save 10–25% on this route
Looking for cheap flights from Boston to San Francisco? CheapoTrav compares every airline serving the BOS–SFO route, including the consolidator and phone-only fares you won't see on Google Flights.
Cable cars, Golden Gate views, and California cool. For most travel weeks, we see published fares plus a 10–25% phone-only discount on this route when you book through the travel desk.
Use the search below for live one-way and round-trip fares, or call us to lock in a phone-only rate immediately.
Top picks
- Flights: San Francisco
Cable cars, Golden Gate views, and California cool.
Frequently asked questions
- How long is the flight from Boston to San Francisco?
- Flight times vary by airline and routing. Direct flights are always fastest; check the live results below for current schedule options.
- What's the cheapest day to fly from Boston to San Francisco?
- Tuesday and Wednesday departures are typically the cheapest on this route. Avoid Friday and Sunday returns if your dates are flexible. Call 1 (815) 473-8090 for phone-only fares
- Are there direct flights from Boston to San Francisco?
- Most major US carriers fly the BOS–SFO route — some directly, others with a connection at a hub. Run the search below for current nonstop options.
- What airlines fly from Boston to San Francisco?
- Major carriers including American, Delta, and United typically serve this route, often joined by Southwest, JetBlue, Spirit, or Frontier depending on the schedule. Call 1 (815) 473-8090 for phone-only fares
- How far in advance should I book?
- For domestic flights, 6–10 weeks ahead is the sweet spot. For international or holiday weeks, plan on 3–6 months ahead.
- Can I find last-minute deals from Boston to San Francisco?
- Yes — distressed-inventory fares pop up regularly inside the 2-week window. Phone-only inventory is especially strong for last-minute travel; call the desk for current rates. Call 1 (815) 473-8090 for phone-only fares