Boston (BOS) to San Francisco (SFO) is about 2,700 miles and typically takes 5 h 55 min by air. Airlines with hubs at both ends are the likeliest to offer nonstops; otherwise expect a connection. Call (800) 490-3234 for live fares.
BOS to SFO at a glance
| Route | Boston (BOS) to San Francisco (SFO) |
|---|---|
| Distance | about 2,700 miles / 4,340 km |
| Typical flight time | 5 h 55 min (estimate) |
| Time difference | 3 hours behind |
| Route type | Domestic (U.S.) |
| Airlines with hubs here | Delta Air Lines, United Airlines, JetBlue Airways, and Alaska Airlines |
About the Boston to San Francisco route
Covering around 2,700 miles, the trip from Boston (BOS) to San Francisco (SFO) is one of the longer domestic routes. Expect several hours in the air and a noticeable shift in local time.
Flight time and distance
A typical flight takes about 5 h 55 min gate to gate, with a realistic range of 5 h 40 min to 6 h 25 min depending on wind, routing and aircraft. That is an estimate based on the distance of roughly 2,700 miles (4,340 km), not a published schedule. Flights heading west usually take noticeably longer than flights heading east because of prevailing winds aloft, so the return flight can differ by 30 minutes or more.
San Francisco is 3 hours behind Boston on standard time, so the arrival time on your ticket will look different from the flight duration.
Among the 200 routes in our guides, BOS to SFO is longer than about 82% of them.
For comparison, Boston to Los Angeles (BOS to LAX) is about 2,610 miles, so San Francisco is a bit farther out from BOS.
The airports
Boston Logan International Airport (BOS)
Logan is only a few minutes by water or road from downtown Boston. Full BOS guide.
San Francisco International Airport (SFO)
SFO is United's main West Coast hub and a key link to Asia and the Pacific. Full SFO guide.
Nearby alternatives: around Boston, Providence; and around San Francisco, Oakland and San Jose. Price all of them before you commit, especially if you have flexible dates.
Airlines on this route
No single carrier we cover has hubs at both BOS and SFO. Delta Air Lines (at BOS), United Airlines (at SFO), JetBlue Airways (at BOS), and Alaska Airlines (at SFO) each operate a large network at one end, so many itineraries on this route connect rather than fly nonstop.
Nonstop availability on any route can shift from one season to the next, so treat this as a guide to who is likely to serve the market, not a timetable.
Common connection points
A one-stop trip would most naturally connect through a hub such as JetBlue Airways via New York (JFK), which adds about 70 miles (3% beyond the direct distance) or Alaska Airlines via Los Angeles (LAX), which adds about 250 miles (9% beyond the direct distance). Choose the connection with the best weather odds for your travel month and leave a comfortable layover; our layover guide explains how much time is realistic.
Best time to fly
Timing matters here. At SFO, fog is most common from June through August; fall is often the clearest time to fly. At BOS, winter nor'easters and summer fog are the main causes of delays.
Ground transport
Getting to and from BOS
The MBTA Blue Line and Silver Line buses connect Logan to downtown, and a water shuttle links the terminals to the Seaport.
Getting to and from SFO
BART trains run directly into the International Terminal and reach downtown San Francisco in about 30 minutes.
Booking tips
Business-heavy routes like BOS to SFO often have the most frequencies on weekday mornings and evenings. If you need flexibility, a standard fare that allows changes is often worth the difference. See Basic Economy vs Main Cabin.
Frequently asked questions
How long is the flight from Boston to San Francisco?
A typical BOS to SFO flight takes about 5 h 55 min, with a likely range of 5 h 40 min to 6 h 25 min. Actual time depends on wind, routing, aircraft and whether you connect.
How far is San Francisco from Boston by air?
The great-circle distance between BOS and SFO is about 2,700 miles (4,340 km).
Which airlines fly from Boston to San Francisco?
Delta Air Lines, United Airlines, JetBlue Airways, and Alaska Airlines have a major presence at BOS or SFO, and service varies by season. Ask us to check current nonstop and connecting options.
What is the time difference between Boston and San Francisco?
San Francisco is 3 hours behind Boston on standard time. Daylight saving time can change the gap for part of the year.
Are there other airports near Boston?
Yes. Nearby alternatives include Providence. Comparing them can change both fare and travel time.
When is the best time to book BOS to SFO?
Domestic fares are often competitive one to three months ahead, while international trips benefit from more lead time. Compare several dates, since fares are priced flight by flight.
Explore related routes
More flights involving Boston (BOS)
- Atlanta to BostonATL to BOS
- Boston to CharlotteBOS to CLT
- Boston to DetroitBOS to DTW
- Boston to Las VegasBOS to LAS
- Boston to LondonBOS to LHR
- Boston to Los AngelesBOS to LAX
More flights involving San Francisco (SFO)
- Delhi to San FranciscoDEL to SFO
- Houston to San FranciscoIAH to SFO
- Los Angeles to San FranciscoLAX to SFO
- Mumbai to San FranciscoBOM to SFO
- New York to San FranciscoJFK to SFO
- Newark to San FranciscoEWR to SFO
Last reviewed October 22, 2026. FlighTicketHub provides general information; confirm details with the airline before you travel.