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$135+ Cheap flights from Boston to San Francisco (BOS - SFO)

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 9/11. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SFO
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
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Cheapflights Tip: The best prices from Boston Logan Intl to San Francisco are usually found in September or January, booked 78 days in advance, depart on a Wednesday or Thursday and return on a Tuesday

Cheap 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 July 29, 2025.

Round-trip from

$239
(Trip.com)

One-way from

$135
(Trip.com)

Popular in

December

Cheapest in

September

Average price

$377

Good round-trip deal

$332 or less

Good one-way deal

$188 or less
From Boston Logan Intl to San Francisco
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One-way flight from Boston Logan Intl to San Francisco
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Highest demand for flights based on searches. 2% potential increase in price ($7 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Boston Logan Intl to San Francisco.
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Price to beat on a one-way flight from Boston Logan Intl to San Francisco.
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Find flight deals from Boston to San Francisco

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 July 29, 2025.

This Trip.com deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/308:23 pmBOS - SFO
Nonstop6h 29mHawaiian Airlines
Sat 9/66:10 amSFO - BOS
Nonstop5h 50mHawaiian Airlines
Deal found 7/28$239
This Rumbo deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Rumbo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/307:55 pmBOS - SFO
Nonstop6h 43mJetBlue
Sat 9/66:15 amSFO - BOS
1 stop9h 18mJetBlue
Deal found 7/28$240
This Kiwi.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/177:45 amBOS - SFO
1 stop8h 27mMultiple Airlines
Sat 9/206:10 amSFO - BOS
Nonstop5h 50mMultiple Airlines
Deal found 7/29$243
This Expedia deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/86:59 pmBOS - SFO
Nonstop6h 51mAlaska Airlines
Wed 11/1211:40 amSFO - BOS
1 stop9h 40mAlaska Airlines
Deal found 7/27$246
This American Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/88:52 amBOS - SFO
1 stop10h 13mAmerican Airlines
Wed 11/126:30 amSFO - BOS
1 stop7h 49mAmerican Airlines
Deal found 7/27$255
This Delta deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/306:45 pmBOS - SFO
Nonstop6h 53mDelta
Sat 9/61:00 pmSFO - BOS
Nonstop5h 50mDelta
Deal found 7/28$263
This Southwest deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/57:20 amBOS - SFO
1 stop9h 35mSouthwest
Thu 11/137:00 pmSFO - BOS
2 stops10h 05mSouthwest
Deal found 7/29$283

Cheapflights Fare Finder

 
Customize 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 2,558,603 searches. Data last updated July 29, 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

Sat 8/30

8:23 pm-11:52 pm

Nonstop6h 29m

San Francisco

Sat 9/6

6:10 am-3:00 pm

Nonstop5h 50m

$239

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sat 8/30

7:55 pm-11:38 pm

Nonstop6h 43m

San Francisco

Sat 9/6

6:15 am-6:33 pm

1 stop9h 18m

$240

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sat 11/8

6:59 pm-10:50 pm

Nonstop6h 51m

San Francisco

Wed 11/12

11:40 am-12:20 am

1 stop9h 40m

$246

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sat 11/8

8:52 am-4:05 pm

1 stop10h 13m

San Francisco

Wed 11/12

6:30 am-5:19 pm

1 stop7h 49m

$255

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sat 8/30

6:45 pm-10:38 pm

Nonstop6h 53m

San Francisco

Sat 9/6

1:00 pm-9:50 pm

Nonstop5h 50m

$263

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 8/28

6:02 am-9:33 am

Nonstop6h 31m

San Francisco

Thu 9/4

1:15 pm-11:57 pm

1 stop7h 42m

$269

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 11/5

7:20 am-1:55 pm

1 stop9h 35m

San Francisco

Mon 11/10

7:00 pm-8:15 am

2 stops10h 15m

$283

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 9/11

9:20 am-3:52 pm

1 stop9h 32m

$135

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Fri 9/19

5:08 pm-11:59 pm

1 stop9h 51m

$136

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Fri 8/22

6:58 am-2:47 pm

1 stop10h 49m

$140

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Showing 1-10 of 16 results
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The best insider tips for Boston to San Francisco flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Boston to San Francisco trip
Airlines
United Airlines

Basic Economy allows a personal item only; no carry-on bags unless exceptions apply.


United Economy Plus offers extra legroom seats at the front of the economy cabin.

Read more about United Airlinesby Harriet Baskas
Alaska Airlines

Alaska's Premium Class offers extra legroom and free cocktails, but snacks require purchase.


Saver Fare allows a carry-on bag, unlike many basic economy tickets.

Read more about Alaska Airlinesby Robert Schrader
Airports
BOS

Use the FlyLogan App for real-time flight updates and pre-order meals through BOS2GO for a quicker departure experience.

Read more about BOSby Paul Rubio
SFO

Travel from SFO to downtown San Francisco via BART for the least expensive option, taking about 40 minutes.

Read more about SFOby Harriet Baskas
Our travel experts
Harriet Baskas

Harriet Baskas

Expert on United Airlines and SFO

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
Robert Schrader

Robert Schrader

Expert on Alaska Airlines

Robert Schrader

Robert Schrader

One of the web's original travel bloggers, Robert launched his first site Leave Your Daily Hell in 2009. Since then, he's expanded into destination niche sites (one each for Japan, Thailand and Taiwan), in addition to having written for the inflight magazines of Singapore Airlines and Korean Air. Overall, he's visited nearly 100 countries, and flies business as often as possible.

Read more
Paul Rubio

Paul Rubio

Expert on BOS

Paul Rubio

Paul Rubio

Travel journalist and photographer Paul Rubio is a Miami native (and current resident), who has lived in nine countries and traveled to 137. He is an expert in luxury travel, eco-travel, loyalty programs, hotels, airports and airlines. He is a contributing editor at AFAR, Condé Nast Traveler, LUXURY Magazine, and Palm Beach Illustrated.

Read more

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 round-trip 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 round-trip flight from Boston to San Francisco. Price data was last updated on July 25, 2025.

To ensure you get the cheapest price possible for a flight from Boston to San Francisco, you should look to book at least 78 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, January is the cheapest month in which you can book a flight from Boston to San Francisco (average of $276). Flying from Boston to San Francisco in June is currently the most expensive (average of $358). 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 July 29, 2025.

It’s typically best to fly out from Boston to San Francisco in the evening. Doing so could potentially save you 41% on the flight price compared to flying at noon, which is usually more expensive.

What is the cheapest day to fly from Boston to San Francisco?

Use this chart to determine the cheapest time to fly round-trip from Boston to San Francisco. Price data was last updated on July 27, 2025.

Travelers seeking maximum savings on their Boston to San Francisco flight should consider departing on Tuesday evenings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Boston to San Francisco

Explore weekly flight availability from Boston to San Francisco. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 29, 2025.

The most flights from BOS to SFO are scheduled on a Sunday (62 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (55 on average).

Reviews of airlines servicing San Francisco

Get insights into the airlines that provide service to San Francisco. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Francisco. Reviews last updated July 29, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest, and Delta from Boston to San Francisco to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,238 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,979 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.8
Good
2,605 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,896 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

  • What airports do I use to fly from Boston to San Francisco?

    If you book a flight from Boston to San Francisco, you will be flying from Logan Intl to San Francisco. Flights to San Francisco (SFO) from Boston Logan Intl (BOS) take 6h 28m for a nonstop flight. There are 58 flights from Logan Intl to San Francisco per day from 9 airlines.

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

    Flights from Boston Logan Intl to San Francisco have been viewed 77 times in the past calendar month.

  • What are the cheapest airlines flying from Boston to San Francisco round-trip?

    According to our current data, Hawaiian Airlines ($239), JetBlue ($240), and Alaska Airlines ($246) offers the cheapest pricing from Boston to San Francisco. Hawaiian Airlines is currently priced 33% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from Boston to San Francisco one-way?

    One-way options have recently been found by users for as low as $135 on Hawaiian Airlines. Other airlines that offer cheap prices include Alaska Airlines from $136 and American Airlines from $140 one-way.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Boston to San Francisco on time: Japan Airlines (89%), Qantas Airways (89%), Icelandair (88%).

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

    On average you can expect to pay $1,158 for a flight from Boston to San Francisco. The cheapest flight overall is $128 while the most popular route, (Boston Logan Intl - San Francisco) is currently priced at $183.

  • 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 vacation 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, January is the cheapest month in which you can book a flight from Boston to San Francisco (average of $276). Flying from Boston to San Francisco in June is currently the most expensive (average of $358). 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

Traveling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Roseville
Mountain View
Santa Cruz
South San Francisco
Livermore
Turlock
Manteca
Antioch
Hollister
Watsonville
Sunnyvale
Newark
Milpitas
Campbell
Foster City
Capitola
Santa Clara
San Leandro
Burlingame
Redwood City

Browse thousands of different options on Cheapflights for your next trip

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Top 9 airlines flying from Boston to San Francisco

Discover the top 9 airlines that operate flights from Boston to San Francisco. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$84Average$209FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$129Average$324FlexibilityNo cancel feeOn-time85%
Sun Country AirCheapest$150Average$328FlexibilityNo cancel feeOn-time83%
SouthwestCheapest$153Average$362FlexibilityNo cancel feeOn-time63%
DeltaCheapest$171Average$357FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$175Average$408FlexibilityNo cancel feeOn-time71%
JetBlueCheapest$196Average$348FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$227Average$411FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$227Average$378FlexibilityNo cancel feeOn-time75%

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