Find flights
Deals
When to book
FAQs

Cheap flights from Boston to San Francisco from $202

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 25/9. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SFO
26 Aug — 2 Sep1
1 adult

Cheapflights Tip: The best prices from Boston Logan Intl to San Francisco are usually found in September or January, booked 83 days in advance, depart on a Friday or Tuesday and return on a Monday

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 21 August 2025.

Round-trip from

$369

One-way from

$202

Popular in

December

Cheapest in

September

Average price

$604

Good one-way deal

$1,401 or less
Alaska Airlines
  • Alaska Airlines
  • 19/11-3/12
  • Nonstop
  • 12h 28m total
  • Boston to San Francisco
Search Deals
Hawaiian Airlines
  • Hawaiian Airlines
  • 25/9
  • Nonstop
  • 6h 29m total
  • Boston to San Francisco
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($22 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($13 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2025
Search Deals
Price to beat on a one-way flight from Boston Logan Intl to San Francisco.
Search Deals

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 21 August 2025.

Wed 24/916:55BOS - SFO
Nonstop6h 36mDelta
Sat 27/907:05SFO - BOS
Nonstop5h 42mDelta
Deal found 21/8$369
Sat 13/918:40BOS - SFO
Nonstop6h 37mDelta
Sat 20/907:05SFO - BOS
Nonstop5h 42mDelta
Deal found 20/8$370
Wed 24/907:20BOS - SFO
1 stop11h 32mHawaiian Airlines
Tue 30/906:10SFO - BOS
Nonstop5h 50mHawaiian Airlines
Deal found 21/8$384
Thu 25/916:55BOS - SFO
Nonstop6h 36mDelta
Sat 27/907:05SFO - BOS
Nonstop5h 42mDelta
Deal found 20/8$386
Wed 12/1107:00BOS - SFO
1 stop9h 50mAlaska Airlines
Wed 19/1108:00SFO - BOS
1 stop13h 20mAlaska Airlines
Deal found 20/8$398
Sat 27/920:10BOS - SFO
Nonstop6h 49mJetBlue
Wed 8/1014:12SFO - BOS
Nonstop5h 47mJetBlue
Deal found 20/8$400
Fri 26/918:18BOS - SFO
Nonstop6h 32mUnited Airlines
Tue 30/907:00SFO - BOS
1 stop7h 51mUnited Airlines
Deal found 20/8$402
Fri 12/920:45BOS - SFO
Nonstop6h 36mDelta
Sun 14/921:51SFO - BOS
Nonstop5h 44mDelta
Deal found 21/8$403
Tue 16/907:45BOS - SFO
1 stop9h 25mAlaska Airlines
Sat 20/906:10SFO - BOS
Nonstop5h 50mAlaska Airlines
Deal found 19/8$406
Sat 27/917:20BOS - SFO
1 stop10h 39mJetBlue
Wed 1/1014:05SFO - BOS
Nonstop6h 02mJetBlue
Deal found 21/8$414
Wed 3/908:15BOS - SFO
Nonstop6h 31mUnited Airlines
Sat 6/908:26SFO - BOS
1 stop7h 29mUnited Airlines
Deal found 19/8$416
Wed 10/907:45BOS - SFO
1 stop8h 27mAlaska Airlines
Sat 20/906:10SFO - BOS
Nonstop5h 50mAlaska Airlines
Deal found 20/8$417

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 21 August 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

Wed 24/9

07:55-11:33

Nonstop6h 38m

San Francisco

Wed 24/9

21:51-06:35

Nonstop5h 44m

$369

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sat 20/9

10:30-14:01

Nonstop6h 31m

San Francisco

Sat 27/9

11:45-20:32

Nonstop5h 47m

$369

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sat 8/11

18:59-22:50

Nonstop6h 51m

San Francisco

Sat 15/11

07:00-15:41

Nonstop5h 41m

$369

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 23/9

20:45-00:21

Nonstop6h 36m

San Francisco

Sat 27/9

07:05-15:47

Nonstop5h 42m

$369

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 21/10

20:25-00:05

Nonstop6h 40m

San Francisco

Tue 4/11

07:00-15:41

Nonstop5h 41m

$369

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 24/9

20:45-00:21

Nonstop6h 36m

San Francisco

Wed 1/10

21:51-06:35

Nonstop5h 44m

$369

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sat 20/9

18:40-22:17

Nonstop6h 37m

San Francisco

Sat 27/9

07:05-15:47

Nonstop5h 42m

$369

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 8/10

19:55-23:41

Nonstop6h 46m

San Francisco

Tue 14/10

21:50-06:30

Nonstop5h 40m

$369

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sat 20/9

07:55-11:33

Nonstop6h 38m

San Francisco

Wed 24/9

07:05-15:45

Nonstop5h 40m

$369

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 23/9

07:55-11:33

Nonstop6h 38m

San Francisco

Tue 23/9

21:51-06:35

Nonstop5h 44m

$369

Flights are sorted by cheapest return flights first.

Deals found on 20/8

Showing 1-10 of 22 results
1
2
3

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 8 August 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 83 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 $876). Flying from Boston to San Francisco in December is currently the most expensive (average of $1,375). 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 21 August 2025.

A simple way to save on the total cost of your ticket is to fly from Boston to San Francisco in the morning. If you’re flexible enough to do this you can expect to save up to 18% on your trip compared to booking a flight at midday.

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 34 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 31m. The distance between Boston and San Francisco is about 4339 km. Most flights are nonstop.

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

    $202 is the cheapest one-way deal found within the past few days, from Hawaiian Airlines. You may also be able to find cheap deals on United Airlines and Delta, with prices starting from $202 and $202, respectively.

  • 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 Etihad Airways (86%), Japan Airlines (85%) and Icelandair (82%).

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

    While on average a flight from Boston to San Francisco is generally $1,552, our data shows the cheapest flight currently is $279. When looking at the most popular route, (Boston Logan Intl - San Francisco), you can expect to pay $352 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 $876). Flying from Boston to San Francisco in December is currently the most expensive (average of $1,375). 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
Los Gatos
Mountain View
Davis
Emeryville
Stanford
Milpitas
Daly City

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.