Find flights
When to book
Airlines

Cheap flights from Belfast Intl Airport to San Francisco Bay Area from £376

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 15/9. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — SFO
1 Sep — 8 Sep1
1 adult

Cheap flight deals from Belfast Intl to San Francisco Bay Area

Keep the following information in mind while searching for Belfast Intl to San Francisco Bay Area flight deals. Data was last updated 27 August 2025.

Round-trip from

£571

One-way from

£376

Popular in

July

Cheapest in

September

Average price

£521
22/9-29/9
  • 22/9-29/9
  • 4 total stops
  • 47h 21m total
  • Belfast to San Francisco Bay Area
Search Deals
15/9
  • 15/9
  • 2 total stops
  • 49h 40m total
  • Belfast to San Francisco Bay Area
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£45 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£14 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

Find flight deals from Belfast Intl to San Francisco Bay Area

Cheapest flights from Belfast Intl to San Francisco Bay Area
Explore the most affordable flight options available from Belfast Intl to San Francisco Bay Area. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 27 August 2025.

Mo 22/906:45BFS - SFO
2 stops22h 33mMultiple Airlines
Mo 29/914:22SFO - BFS
2 stops24h 48mMultiple Airlines
Deal found 25/8£571
Do 20/1106:15BFS - SFO
3 stops41h 50mMultiple Airlines
Fr 5/1213:00SFO - BFS
3 stops25h 00mMultiple Airlines
Deal found 25/8£581
Do 9/1007:00BFS - SFO
2 stops20h 00mMultiple Airlines
Do 16/1019:30SFO - BFS
2 stops19h 20mMultiple Airlines
Deal found 25/8£741
Fr 10/1007:05BFS - SFO
2 stops16h 50mMultiple Airlines
Fr 17/1017:40SFO - BFS
2 stops19h 20mMultiple Airlines
Deal found 26/8£857

Cheapflights Fare Finder

 
Customise your flight search to find flights from Belfast Intl to San Francisco Bay Area 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 858,174 searches. Data last updated 27 August 2025.
Use the filters below to find and compare flights from Belfast Intl Airport to San Francisco Bay Area that are best for you.

Fly from

Belfast Intl

Fly to

San Francisco Bay Area

Route

Depart

Return

Price

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

Mo 22/9

06:45-21:18

2 stops22h 33m

San Francisco

Mo 29/9

14:22-23:10

2 stops24h 48m

£571

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

Do 20/11

06:15-16:05

3 stops41h 50m

San Francisco

Fr 5/12

13:00-22:00

3 stops25h 00m

£581

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

Do 9/10

07:00-19:00

2 stops20h 00m

San Francisco

Do 16/10

19:30-22:50

2 stops19h 20m

£741

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

Fr 10/10

07:05-15:55

2 stops16h 50m

San Francisco

Fr 17/10

17:40-21:00

2 stops19h 20m

£857

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

Mo 15/9

20:55-14:35

2 stops49h 40m

£376

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

Do 4/9

06:10-12:23

2 stops38h 13m

£685

Flights are sorted by cheapest return flights first.

Deals found on 25/8

Best time to book a flight from Belfast Intl to San Francisco Bay Area

Have a flexible travel schedule? Discover the best time to fly to San Francisco Bay Area from Belfast Intl 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 Belfast Intl Airport to San Francisco Bay Area

What is the cheapest time of day to fly from BFS to XIH?

Find hourly flight availability from Belfast Intl to San Francisco Bay Area. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 27 August 2025.

When flying from Belfast Intl Airport to San Francisco Bay Area, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Reviews of airlines servicing San Francisco Bay Area

Get insights into the airlines that provide service to San Francisco Bay Area. 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 Bay Area. Reviews last updated 27 August 2025.
Check out reviews from past customers who have flown with American Airlines and British Airways from Belfast Intl Airport to San Francisco Bay Area to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.2
Good
10,000 reviews
Check prices

Comfort

7.2

Entertainment

6.9

Overall

7.2

Crew

8.0

Food

6.5

Boarding

7.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2024

LHR - SAN

This was the best flight I have experienced in all the years I have been f doing this journey with BA. Flight, food and service A1. Well done BA.
American Airlines
7.2
Good
10,000 reviews
American Airlines
7.2
Good
10,000 reviews
Check prices

Comfort

7.2

Entertainment

6.9

Overall

7.2

Crew

8.0

Food

6.5

Boarding

7.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2024

LHR - SAN

This was the best flight I have experienced in all the years I have been f doing this journey with BA. Flight, food and service A1. Well done BA.
British Airways
6.7
Okay
7,310 reviews
American Airlines
7.2
Good
10,000 reviews
Check prices

Comfort

7.2

Entertainment

6.9

Overall

7.2

Crew

8.0

Food

6.5

Boarding

7.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2024

LHR - SAN

This was the best flight I have experienced in all the years I have been f doing this journey with BA. Flight, food and service A1. Well done BA.

Related info for your journey

Find useful and relevant information for your journey from Belfast Intl to San Francisco Bay Area. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • Can I find deals for flights from Belfast Intl to San Francisco Bay Area that include hotel bookings?

    Yes. In addition to deals on Belfast Intl to San Francisco Bay Area flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Belfast Intl to San Francisco Bay Area?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Belfast Intl to San Francisco Bay Area.

  • Can I find deals for business class flights from Belfast Intl to San Francisco Bay Area?

    Yes. Cheapflights offers flight deals from Belfast Intl to San Francisco Bay Area 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 Belfast Intl Airport to San Francisco Bay Area?

    Currently, February is the cheapest month in which you can book a flight from Belfast Intl Airport to San Francisco Bay Area (average of £538). Flying from Belfast Intl Airport to San Francisco Bay Area in July is currently the most expensive (average of £803). 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

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.

Top 2 airlines flying from Belfast Intl to San Francisco Bay Area

Discover the top 2 airlines that operate flights from Belfast Intl to San Francisco Bay Area. 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 858,174 searches. Data last updated 27 August 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£405Average£532FlexibilityNo cancel feeOn-time70%
Search British Airways flights
American AirlinesCheapest£470Average£521FlexibilityNo cancel feeOn-time71%
Search American Airlines 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 Belfast Intl to San Francisco Bay Area?

Deals for Belfast Intl to San Francisco Bay Area flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Belfast Intl to San Francisco Bay Area?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to San Francisco Bay Area from Belfast Intl.

Can Cheapflights find flights from Belfast Intl to San Francisco Bay Area with no change fees?

Certainly. Search results for flights to San Francisco Bay Area from Belfast Intl shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Belfast Intl to San Francisco Bay Area become cheaper?

Yes, Cheapflights offers price alerts on Belfast Intl to San Francisco Bay Area flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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.