Question 1

How popular is this Boston to San Francisco flight route?

Accepted Answer

Flights from Boston Logan Intl to San Francisco have been viewed 9 times in the past calendar month.

Question 2

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

Accepted Answer

Cheapflights users have booked flights from Boston to San Francisco round-trip from C$ 338. Other airlines that can offer you cheap pricing are Delta, from C$ 341, and American Airlines, from C$ 351. Alaska Airlines is 31% cheaper than the average price of flights available within the next 90 days to this destination.

Question 3

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

Accepted Answer

The cheapest airlines for a one-way flight from Boston to San Francisco are Hawaiian Airlines (C$ 186), Alaska Airlines (C$ 191), and United Airlines (C$ 193).

Question 4

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

Accepted Answer

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.

Question 5

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

Accepted Answer

Currently, January is the cheapest month in which you can book a flight from Boston to San Francisco (average of C$ 276). Flying from Boston to San Francisco in December is currently the most expensive (average of C$ 368). 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.

Question 6

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

Accepted Answer

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

Question 7

Weekly flight availability from Boston to San Francisco

Accepted Answer

The most flights from BOS to SFO are scheduled on a Tuesday (60 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (35 on average).

Question 8

E

Accepted Answer

In terms of precipitation, rainfall in San Francisco ranges from 0.0 - 112.0 mm per month. January is typically the wettest month, when rainfall can reach 112.0 mm. July is typically the driest time to visit San Francisco when rainfall is around 0.0 mm.

Question 9

E

Accepted Answer

If weather is an important factor for your trip to San Francisco, use this chart to help with planning. For those seeking warmer temperatures, September is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 11.0 C).

Question 10

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

Accepted Answer

No one likes to see their flight delayed. When booking a flight from Boston to San Francisco consider choosing Japan Airlines (89%), Qantas Airways (89%) or Icelandair (88%) as they are the most reliable in getting you off to your destination on time.

Question 11

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

Accepted Answer

Saturday flights are found to be more expensive to fly from Boston to San Francisco. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to San Francisco.

Question 12

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

Accepted Answer

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 57 days in advance, which can save you up to 81% on flights from Boston to San Francisco compared to booking the week you need them. Waiting 57 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at C$ 583. For sooner than that we have options available in the next 3 days from C$ 754.

Question 13

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

Accepted Answer

The best pricing can be found in the month of September. Prices to San Francisco from Boston average C$ 491. You can even find prices in September for less than C$ 491, as users have found deals to San Francisco from as low as C$ 177. The month of December appears to be one of the more expensive times to travel to San Francisco from Boston. Flying in the targeted month can save you up to 15%.

Question 14

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

Accepted Answer

When flying from Boston to San Francisco, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 48% versus a flight at noon.

Question 15

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

Accepted Answer

If you wish to fly to San Francisco from Boston, then you need to book flights from Boston Logan Intl to San Francisco. There are 48 flights from Logan Intl (BOS) to San Francisco (SFO) per day to choose from. Flights to San Francisco from Logan Intl are available from 2 different airlines, which means you should have some options if you want to compare airfare deals. 6h 51m is how long a nonstop flight from Boston to San Francisco typically takes.

Question 16

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

Accepted Answer

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

Question 17

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

Accepted Answer

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.

Question 18

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

Accepted Answer

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.

Question 19

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

Accepted Answer

When you search for this flight from Boston to San Francisco, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Question 20

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

Accepted Answer

Cheapflights helps you find that perfect flight to San Francisco from Boston by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Question 21

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

Accepted Answer

Cheapflights does show flights with no change fees to all users. To see these options for flights from Boston to San Francisco, users can toggle the no change fees filter when performing a flight search.

Question 22

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

Accepted Answer

Not ready to book yet? You can track prices for flights from Boston to San Francisco on Cheapflights with our Price Alert feature and get notified when better prices are available.

Round-trip from	C$ 338
One-way from	C$ 186
Popular in	December
Cheapest in	September
Average price	C$ 519

Airline	Cheapest	Average	Flexibility	On-time
Delta	CheapestC$ 204	AverageC$ 351	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
JetBlue	CheapestC$ 270	AverageC$ 531	FlexibilityNo cancel fee	On-time62%	Search JetBlue flights

Cheap flights from Boston to San Francisco

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 Thursday or Friday and return on a Tuesday

Cheap flight deals from Boston to San Francisco

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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.

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 25 July 2025.

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

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 30 July 2025.

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 30 July 2025.

Reviews of airlines servicing San Francisco

Get a feel of what it's like to fly with Alaska Airlines,Southwest, andDelta from Boston to San Francisco by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

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?

How popular is this Boston to San Francisco flight route?

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

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

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

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

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

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

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

Travelling to a place near San Francisco?

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Alternative routes for Boston to San Francisco

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Top 2 airlines flying from Boston to San Francisco

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

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

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

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

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