Boston (BOS) to San Francisco (SFO) is about 2,697 miles (4,341 km), roughly 5 h 55 min of flying time. San Francisco is 3 hours behind Boston all year.
When is the cheapest time to fly from Boston to San Francisco?
Lowest round-trip fares found in recent searches for each month (7 to 14 day trips). Pick a cheap month, then confirm the live price.
Are there nearby airports that could be cheaper?
Fares at a neighboring airport are sometimes lower. Worth comparing on this route:
- PVDRhode Island T. F. Green International Airport south of Boston in Rhode Island.
- MHTManchester-Boston Regional Airport north of Boston in New Hampshire.
- OAKOakland San Francisco Bay Airport across the bay in Oakland.
- SJCSan José Mineta International Airport serves San José and Silicon Valley.
What ID do I need for this flight?
For domestic US flights, adults need a REAL ID-compliant license or another TSA-accepted ID, such as a passport. Read our REAL ID guide.
Need a car in San Francisco?
Compare rental cars for your travel dates, with the total price including fees.
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Things to do in San Francisco
Popular attractions and tickets, most with free cancellation.
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Frequently asked questions
How far is Boston from San Francisco by plane?
The great-circle distance between BOS and SFO is about 2,697 miles (4,341 km).
How long does it take to fly from Boston to San Francisco?
About 5 h 55 min of flying time based on distance, if a nonstop flight operates. Actual schedules vary by airline and wind, and itineraries with connections take longer.
What is the time difference between Boston and San Francisco?
San Francisco is 3 hours behind Boston all year.
Distance and flying time are calculated from airport coordinates (OurAirports data) and a typical cruise speed; they are planning estimates, not schedules. Updated 2026-10-28.
