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Cheap flights from Boston to San Francisco from $176

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 23/2. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SFO
27 Jan — 3 Feb1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Boston Logan Intl to San Francisco are usually found in March or January, booked 67 days in advance, depart on a Wednesday or Monday and return on a Monday

Cheap flight deals from Boston to San Francisco

Enter your travel dates to find the best prices.

Cheapest flights from Boston to San Francisco
Explore the most affordable flight options available from Boston to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 December 2025.

Tue 30/1215:15BOS - SFO
1 stop11h 44mDelta
Tue 27/107:10SFO - BOS
Nonstop5h 41mDelta
Deal found 27/12$606
Wed 31/1207:40BOS - SFO
Nonstop6h 57mDelta
Fri 9/113:00SFO - BOS
Nonstop5h 37mDelta
Deal found 26/12$711
Tue 30/1220:59BOS - SFO
Nonstop6h 53mJetBlue
Wed 14/110:50SFO - BOS
1 stop10h 23mJetBlue
Deal found 27/12$753
Tue 30/1215:15BOS - SFO
1 stop11h 44mDelta
Wed 14/108:55SFO - BOS
1 stop18h 19mDelta
Deal found 27/12$768
Wed 31/1206:00BOS - SFO
Nonstop6h 49mUnited Airlines
Tue 6/113:00SFO - BOS
Nonstop5h 42mUnited Airlines
Deal found 26/12$807
Wed 31/1206:00BOS - SFO
Nonstop6h 49mUnited Airlines
Sun 4/118:28SFO - BOS
1 stop8h 30mUnited Airlines
Deal found 26/12$821
Sun 28/1211:00BOS - SFO
Nonstop6h 49mJetBlue
Fri 9/120:37SFO - BOS
1 stop8h 20mJetBlue
Deal found 27/12$827

Find flight deals from Boston to San Francisco

Discover tips and strategies to find the most affordable flight options for your journey from Boston (BOS) to San Francisco (SFO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 28 December 2025.

Round-trip from

$342

One-way from

$176

Popular in

December

Cheapest in

March

Average price

$680

Good one-way deal

$287 or less
Delta
  • Delta
  • 21/1-27/1
  • 1 total stop
  • 18h 13m total
  • Boston to San Francisco
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Alaska Airlines
  • Alaska Airlines
  • 23/2
  • 1 total stop
  • 9h 15m total
  • Boston to San Francisco
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($42 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease ($19 potential savings vs. average return price).
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Average for round-trip flights in December 2025
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Price to beat on a one-way flight from Boston Logan Intl to San Francisco.
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Cheapflights Fare Finder

 
Customise your flight search to find flights from Boston to San Francisco that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 28 December 2025.
Use the filters below to find and compare flights from Boston to San Francisco that are best for you.

Fly from

Boston

Fly to

San Francisco

Route

Depart

Return

Price

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 27/1

16:20-22:47

1 stop9h 27m

San Francisco

Sun 1/2

06:00-23:54

1 stop14h 54m

$351

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 5/2

07:55-11:48

Nonstop6h 53m

San Francisco

Mon 9/2

23:25-08:10

Nonstop5h 45m

$353

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Mon 19/1

07:11-11:10

Nonstop6h 59m

San Francisco

Fri 23/1

20:29-05:00

Nonstop5h 31m

$353

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Fri 20/2

06:15-10:08

Nonstop6h 53m

San Francisco

Sun 1/3

15:25-23:58

Nonstop5h 33m

$365

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sun 25/1

05:10-14:12

1 stop12h 02m

San Francisco

Wed 28/1

15:25-23:58

Nonstop5h 33m

$365

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 20/1

17:07-00:22

1 stop10h 15m

San Francisco

Wed 21/1

20:29-05:00

Nonstop5h 31m

$365

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sun 25/1

06:00-11:49

1 stop8h 49m

San Francisco

Sun 1/2

13:00-21:42

Nonstop5h 42m

$368

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sun 25/1

07:50-11:50

Nonstop7h 00m

San Francisco

Tue 27/1

16:03-06:14

1 stop11h 11m

$372

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 21/1

07:30-22:54

1 stop18h 24m

San Francisco

Sun 25/1

13:00-21:37

Nonstop5h 37m

$372

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sun 18/1

17:40-21:42

Nonstop7h 02m

San Francisco

Tue 27/1

16:03-06:14

1 stop11h 11m

$372

Flights are sorted by cheapest return flights first.

Deals found on 26/12

Showing 1-10 of 23 results
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Best time to book a flight from Boston to San Francisco

Have a flexible travel schedule? Discover the best time to fly to San Francisco from Boston with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Boston to San Francisco

How far ahead should I book a flight from Boston to San Francisco?

Use this chart to determine the optimal time to book a return flight from Boston to San Francisco. Price data was last updated on 26 December 2025.

The price you pay for your flight from Boston to San Francisco may vary depending on when you book. For the best chance of a lower fare, look to book 67 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Boston to San Francisco?

Currently, March is the cheapest month in which you can book a flight from Boston to San Francisco (average of $153). Flying from Boston to San Francisco in May is currently the most expensive (average of $266). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from BOS to SFO?

Find hourly flight availability from Boston to San Francisco. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 28 December 2025.

A simple way to save on the total cost of your ticket is to fly from Boston to San Francisco in the evening. If you’re flexible enough to do this you can expect to save up to 88% on your trip compared to booking a flight in the morning.

Related info for your journey

Find useful and relevant information for your journey from Boston to San Francisco. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How popular is this Boston to San Francisco flight route?

    Flights from Boston Logan Intl to San Francisco have been viewed 26 times in the past calendar month.

  • How long is the flight from Boston to San Francisco?

    Departing from Boston to San Francisco will take you 6h 53m. The distance between Boston and San Francisco is about 4339 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the most reliable airlines from Boston to San Francisco?

    The top 3 most reliable airlines when flying from Boston to San Francisco are China Eastern (100%), Air China (89%) and Korean Air (88%).

  • What are the cheapest flights from Boston to San Francisco?

    While on average a flight from Boston to San Francisco is generally $290, our data shows the cheapest flight currently is $203. When looking at the most popular route, (Boston Logan Intl - San Francisco), you can expect to pay $293 for that flight.

  • Can I find deals for flights from Boston to San Francisco that include hotel bookings?

    Yes. In addition to deals on Boston to San Francisco flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Boston to San Francisco?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boston to San Francisco.

  • Can I find deals for business class flights from Boston to San Francisco?

    Yes. Cheapflights offers flight deals from Boston to San Francisco by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Boston to San Francisco?

    Currently, March is the cheapest month in which you can book a flight from Boston to San Francisco (average of $153). Flying from Boston to San Francisco in May is currently the most expensive (average of $266). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Sausalito
Santa Cruz
Davis
Milpitas

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Boston to San Francisco

See prices for flight routes from nearby airports that may be better suited for you.
Boston to Los Angeles flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Boston to San Francisco?

Cheapflights helps you search for flights from Boston to San Francisco via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Boston to San Francisco?

Millions of users choose and trust Cheapflights to book the best flight deals from Boston to San Francisco for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Boston to San Francisco with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Boston to San Francisco flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Boston to San Francisco become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to San Francisco from Boston today and book when prices fit your budget.

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