$121 Cheap United flights from Boston to San Francisco (BOS to SFO)

Find The Best Day To Fly from Boston to San Francisco

Amazing United BOS to SFO Flight Deals

The cheapest flights to San Francisco Intl. found within the past 7 days were $237 round trip and $121 one way. Prices and availability subject to change. Additional terms may apply.

Wed, Nov 5 - Wed, Nov 12
BOS
Boston
SFO
San Francisco
$237 Roundtrip, just found
$237
Roundtrip
just found
Select United flight, departing Wed, Nov 5 from Boston to San Francisco, returning Wed, Nov 12, priced at $237 just found
Wed, Nov 5 - Wed, Nov 12
BOS
Boston
SFO
San Francisco
$241 Roundtrip, just found
$241
Roundtrip
just found
Select United flight, departing Wed, Nov 5 from Boston to San Francisco, returning Wed, Nov 12, priced at $241 just found
Wed, Nov 5 - Wed, Nov 12
BOS
Boston
SFO
San Francisco
$247 Roundtrip, just found
$247
Roundtrip
just found
Select United flight, departing Wed, Nov 5 from Boston to San Francisco, returning Wed, Nov 12, priced at $247 just found
Sun, Sep 21 - Tue, Sep 23
BOS
Boston
SFO
San Francisco
$252 Roundtrip, found 3 hours ago
$252
Roundtrip
found 3 hours ago
Select United flight, departing Sun, Sep 21 from Boston to San Francisco, returning Tue, Sep 23, priced at $252 found 3 hours ago
Wed, Nov 5 - Wed, Nov 12
BOS
Boston
SFO
San Francisco
$266 Roundtrip, just found
$266
Roundtrip
just found
Select United flight, departing Wed, Nov 5 from Boston to San Francisco, returning Wed, Nov 12, priced at $266 just found

SFO From BOS Economy Coach Packages on Similar Airlines

Price found within the past 48 hours. Click for updated prices.
Bay Landing San Francisco Airport Hotel

Bay Landing San Francisco Airport Hotel

3 out of 5
per person
Sep 22 - Sep 26
found 5 hours ago
Roundtrip flight included
Boston (BOS) to San Francisco (SFO)
Juniper Hotel Cupertino, Curio Collection by Hilton

Juniper Hotel Cupertino, Curio Collection by Hilton

4 out of 5
Save 100% on your flight
per person
Jul 23 - Jul 29
found 1 day ago
Roundtrip non-stop flight included
Boston (BOS) to San Jose (SJC)
@ Marbella Lane - 3BR Designer Near Valley Fair

@ Marbella Lane - 3BR Designer Near Valley Fair

3 out of 5
Save 100% on your flight
per person
Sep 2 - Sep 7
found 1 day ago
Roundtrip non-stop flight included
Boston (BOS) to San Jose (SJC)
Don't see what you're looking for?
See all available trips from Logan Intl. to San Francisco Intl.
View all trips

Frequently asked questions

Can I catch a flight from BOS to SFO right now?
It's prudent to find out about any travel advice reports and quarantine requirements in place in your destination city. Ensure you visit the Covid-19 Travel Advisor for up-to-date info on flying to San Francisco Airport from Logan Intl. Airport (BOS).
What terminal is United Airlines at Logan Intl. Airport (BOS)?
If you're flying with United Airlines from Logan Intl. Airport, you'll generally be boarding from terminal B. If you're jetting to SFO from here, you're likely to be disembarking at terminal 3.
Are there United Airlines non-stop flights from BOS to SFO?
Yes, there are. Save yourself time and trouble and fly straight from BOS to SFO with United Airlines. Avoid transfers, lessen the risk of losing your belongings and get your vacation underway faster --- direct flights are preferred by many wise travelers.
How long is a United Airlines flight from BOS to SFO?
Depending on no delays and good weather, your United Airlines flight from BOS to SFO should take about 7 hours and 30 minutes. That means you've got ample time to eat a meal, squeeze in a nap and fine tune your travel itinerary before touchdown.
What type of aircraft does United Airlines fly from BOS to SFO?
The Boeing 757-200 and the Boeing 737-800 are the aircraft models most often flown by United Airlines between Logan Intl. Airport (BOS) and San Francisco Intl. Airport (SFO).
How many direct and indirect flights does United Airlines fly from BOS to SFO?
When jetting from BOS to SFO, you'll discover around 6 United Airlines daily flights to pick from.
If I am not able to travel due to COVID-19, can I change my booking to a later date?
For more info about changing your flight to SFO, please visit our Customer Service Portal.
What is the best day to buy a plane ticket?
This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that is when prices are generally at their highest.
What are the cheapest days to fly?
Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2021, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.
How far in advance can you book a flight?
Trying to figure out how early you should book your flight? It's possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.

Discover our best United flight from Boston BOS to San Francisco SFO 

To find the best deals on flights to Boston from San Francisco with United, just enter your travel dates, filter by United, and hit search. You’ll find flights to choose from and can sort by price, flight duration, and arrival or departure time.  

 

Return flights from Boston BOS to San Francisco SFO with United 

If you’re planning a round trip, booking return flights with United is usually the most cost-effective option. With airfares ranging from $237 to $266, it’s easy to find a flight that suits your budget. Prices and availability subject to change. Additional terms may apply. 

 

Book one-way United flights from Boston BOS to San Francisco SFO 

A one-way ticket gives you much greater flexibility—allowing you to choose your return date, destination, and time whenever you’re ready. By booking in advance you can find great deals on one-way tickets too. Right now, a one-way United flight from Boston to San Francisco costs from $121. Prices and availability subject to change. Additional terms may apply. 

 

The easy way to find cheap flights to San Francisco SFO from  Boston BOS with United 

To find a cheap United flight from Boston BOS to San Francisco SFO, sort your search results by price or filter by budget. Thanks to Travelocity’s Price Match Promise, if you find a better airfare deal anywhere else within 24 hours, we’ll credit or refund the difference. 

 

How to find our best airfare deals on United flights from Boston BOS to San Francisco SFO 

If you’re looking for cheap flights, it helps to be flexible when it comes to your travel dates. You’ll usually find lower cost tickets when you travel during quieter months such as November, or if you book a flight with a stopover. 

 

Find nonstop flights from Boston BOS to San Francisco SFO with United 

If you’re keen to be on San Francisco soil fast, don’t waste time with a stopover—filter your search results to show direct United flights only. The journey takes around hour(s) min(s) – so you’ll be there before you know it. 

 

Flexible airline tickets for United flights from Boston BOS to San Francisco SFO 

Make sure you’re not out of pocket if plans change by choosing a flexible ticket with penalty-free amendment and cancellation options. Use our ‘no change fee’ filter to see which flights have this option.  

 

There are a lot of reasons to book your flights to San Francisco SFO from  Boston BOS with United on Travelocity 

At Travelocity our vast and up-to-the-minute inventory puts all of our best flight deals in one place. So, whether you’re traveling on business or jetting off with friends and family, you can trust Travelocity to get you there.

United Airports
Hop on a(n) United flight today by flying to many destinations out of these domestic and international airports:
Airport code
Country
Airport name
Number of flights
ORDUSAO'Hare Intl.227
DENUSADenver Intl.226
IAHUSAGeorge Bush Intercontinental136
IADUSAWashington Dulles Intl.100
SFOUSASan Francisco Intl.64
LAXUSALos Angeles Intl.23
EWRUSALiberty Intl.20
FRADEUFrankfurt Intl.19
NRTJPNNarita Intl.19
PEKCHNCapital Intl.16

Travelers ❤️ these 🏨 after their flight to San Francisco

Grand Hyatt at SFO
Grand Hyatt at SFO
4 out of 5
55 S McDonnell Rd, San Francisco, CA
This hotel features a restaurant, a gym, and a bar/lounge. Traveling on business? Take advantage of the free WiFi in public areas, laundry service, and valet ...
9.6/10 Exceptional! (1,361 reviews)
"great location quiet and clean"

Reviewed on Jul 8, 2025

Grand Hyatt at SFO
SFO El Rancho Inn SureStay Collection by Best Western
SFO El Rancho Inn SureStay Collection by Best Western
3 out of 5
1100 El Camino Real, Millbrae, CA
This hotel features a 24-hour gym and a seasonal outdoor pool. Traveling on business? Take advantage of the 2 conference rooms, along with free WiFi in public ...
8.2/10 Very Good! (2,809 reviews)
"Nice place to stay, close to the airport. Continental breakfast was nice. Staff was very friendly."

Reviewed on Jul 9, 2025

SFO El Rancho Inn SureStay Collection by Best Western
Crowne Plaza San Francisco Airport by IHG
Crowne Plaza San Francisco Airport by IHG
3.5 out of 5
1177 Airport Blvd, Burlingame, CA
This hotel features an indoor pool and a gym. Traveling on business? Take advantage of the 24-hour business center, free WiFi in public areas, and airport shuttle. ...
7.6/10 Good! (1,878 reviews)
"Overall the property is safe, quiet, and has friendly staff. The bar/restaurant, while not well-attended, is great for having food and a beverage. The hotel is old and needs updates. The flooring, room doors, walls, ect all all very old and is indicative of the hotel's age. That said, I enjoyed my ..."

Reviewed on Jul 8, 2025

Crowne Plaza San Francisco Airport by IHG
Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.
*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.