How much does it cost to fly round-trip from Boston to San Francisco?

Airfare is below average for this route at the moment. Boston to San Francisco flights typically cost between $286 and $486 in August. The cheapest round-trip price found within the last 3 days was $239 on Southwest (Aug 30-Sep 6).

How popular is this Boston to San Francisco flight route?

Flights from Boston Logan Intl to San Francisco have been viewed 75 times in the past calendar month.

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

According to our current data, Southwest ($239), and Hawaiian Airlines ($241) offers the cheapest pricing from Boston to San Francisco. Southwest is currently priced 33% below the average price you’ll pay for this route.

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

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 day to fly from Boston to San Francisco?

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

The most flights from BOS to SFO are scheduled on a Thursday (62 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (42 on average).

In terms of precipitation, rainfall in San Francisco ranges from 0.0 - 4.4 inches per month. January is typically the wettest month, when rainfall can reach 4.4 in. July is typically the driest time to visit San Francisco when rainfall is around 0.0 in.

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 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 51.8 F).

What are the cheapest flights from Boston to San Francisco?

On average you can expect to pay $921 for a flight from Boston to San Francisco. The cheapest flight overall is $119 while the most popular route, (Boston Logan Intl - San Francisco) is currently priced at $174.

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: KLM (86%), Japan Airlines (85%), ANA (84%).

What are the most popular airlines that fly from Boston to San Francisco?

Before booking your flight from Boston to San Francisco check out the most popular airlines for this route: American Airlines, Alaska Airlines or JetBlue.

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

Flying to your destination on a Saturday can be more expensive, but this shouldn’t discourage you from finding affordable options to get to San Francisco. Check prices with Cheapflights to find a great deal for your trip.

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

To save up to 82% on this flight, we recommend booking at least 51 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Boston to San Francisco from $424 1-2 weeks out and tickets from $552 for flights departing within the next 72 hours.

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

The best pricing can be found in the month of September. Prices to San Francisco from Boston average $357. You can even find prices in September for less than $357, as users have found deals to San Francisco from as low as $129. 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%.

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

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 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 29m for a nonstop flight. There are 52 flights from Logan Intl to San Francisco per day from 9 airlines.

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.

$133+ Flights from Boston to San Francisco

Round-trip from	$239 (Southwest)
One-way from	$133 (Southwest)
Popular in	December
Cheapest in	September
Average price	$382
Good round-trip deal	$319 or less
Good one-way deal	$183 or less

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.

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$84	Average$209	FlexibilityNo cancel fee	On-time62%
Hawaiian Airlines	Cheapest$129	Average$324	FlexibilityNo cancel fee	On-time85%
Sun Country Air	Cheapest$150	Average$328	FlexibilityNo cancel fee	On-time83%
Southwest	Cheapest$153	Average$364	FlexibilityNo cancel fee	On-time63%
Delta	Cheapest$174	Average$358	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$178	Average$405	FlexibilityNo cancel fee	On-time71%
JetBlue	Cheapest$196	Average$348	FlexibilityNo cancel fee	On-time62%
United Airlines	Cheapest$227	Average$411	FlexibilityNo cancel fee	On-time69%
Alaska Airlines	Cheapest$227	Average$378	FlexibilityNo cancel fee	On-time75%

$133+ 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 8/29. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Boston to San Francisco with Cheapflights

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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

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Cheapest flights from Boston to San FranciscoExplore 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 August 8, 2025.

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 August 8, 2025.

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Use the filters below to find and compare flights from Boston to San Francisco that are best for you.

The best insider tips for Boston to San Francisco flights

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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 August 1, 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 August 8, 2025.

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 August 3, 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 August 8, 2025.

How much does it cost to fly round-trip from Boston to San Francisco?

Reviews of airlines servicing San Francisco

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.

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 most reliable airlines from Boston to San Francisco?

What are the cheapest flights 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?

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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 August 8, 2025.