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Cheap flights from Belfast Intl Airport to San Francisco from £347

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 1/9. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — SFO
19 May — 26 May1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Belfast Intl to San Francisco

Enter your travel dates to find the best prices.

Cheapest flights from Belfast Intl to San Francisco
Explore the most affordable flight options available from Belfast Intl to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 19 April 2026.

Tue 2/606:40
BFS
-
SFO
3 stops39h 55m
Multiple Airlines
Tue 9/606:00
SFO
-
BFS
3 stops29h 40m
Multiple Airlines
Deal found 18/4£680
Tue 12/506:15
BFS
-
SFO
2 stops19h 45m
Multiple Airlines
Tue 19/515:05
SFO
-
BFS
2 stops21h 50m
Multiple Airlines
Deal found 14/4£815
Sun 31/509:55
BFS
-
SFO
2 stops34h 55m
Multiple Airlines
Sun 7/615:05
SFO
-
BFS
2 stops21h 10m
Multiple Airlines
Deal found 16/4£947
Fri 29/516:45
BFS
-
SFO
2 stops29h 55m
Multiple Airlines
Fri 5/616:45
SFO
-
BFS
2 stops20h 00m
Multiple Airlines
Deal found 14/4£1,032

Find flight deals from Belfast Intl to San Francisco

Discover tips and strategies to find the most affordable flight options for your journey from Belfast Intl (BFS) 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 19 April 2026.

Round-trip from

£670

One-way from

£347

Popular in

March

Cheapest in

September

Average price

£582
3/6-10/6
  • 3/6-10/6
  • 5 total stops
  • 70h 50m total
  • Belfast to San Francisco
Search Deals
1/9
  • 1/9
  • 3 total stops
  • 53h 50m total
  • Belfast to San Francisco
Search Deals
Highest demand for flights based on searches. 22% potential increase in price (£151 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease (£47 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Belfast Intl 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 858,174 searches. Data last updated 19 April 2026.
Use the filters below to find and compare flights from Belfast Intl Airport to San Francisco that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

Tue 2/6

06:40-14:35

3 stops39h 55m

San Francisco

Tue 9/6

06:00-19:40

3 stops29h 40m

£680

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

Tue 12/5

14:45-20:50

1 stop38h 05m

San Francisco

Tue 19/5

23:15-08:30

1 stop25h 15m

£907

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

Sun 31/5

09:55-12:50

2 stops34h 55m

San Francisco

Sun 7/6

15:05-20:15

2 stops21h 10m

£947
Fastest return journey

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

Fri 29/5

22:15-16:15

2 stops26h 00m

San Francisco

Fri 5/6

08:30-21:15

3 stops28h 45m

£1,110
Cheapest one-way

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

Tue 1/9

16:40-14:30

3 stops53h 50m

£347

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

Tue 7/7

20:15-15:55

2 stops27h 40m

£498
Fastest single journey

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

Sat 19/9

06:00-17:40

1 stop19h 40m

£528

Flights are sorted by cheapest return flights first.

Deals found on 15/4

Sorted by cheapest first

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

Have a flexible travel schedule? Discover the best time to fly to San Francisco 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

How much does it cost for a return flight from Belfast Intl Airport to San Francisco?

Reviews of airlines servicing San Francisco

Get insights into the airlines that provide service to San Francisco. 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. Reviews last updated 19 April 2026.
Read reviews from past customers who have flown with American Airlines and British Airways from Belfast Intl Airport to San Francisco. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.1
Good
11,621 reviews
Check prices

Comfort

7.2

Overall

7.1

Food

6.4

Entertainment

6.9

Boarding

7.5

Crew

7.9

Reviews

1 / 20
2.0
Mediocre

Anonymous,Mar 2026

MIA - SFO

Horrible. When they power flights for other airlines there is nothing they can do to change or accommodate any changes
American Airlines
7.1
Good
11,621 reviews
American Airlines
7.1
Good
11,621 reviews
Check prices

Comfort

7.2

Overall

7.1

Food

6.4

Entertainment

6.9

Boarding

7.5

Crew

7.9

Reviews

1 / 20
2.0
Mediocre

Anonymous,Mar 2026

MIA - SFO

Horrible. When they power flights for other airlines there is nothing they can do to change or accommodate any changes
British Airways
6.7
Okay
7,893 reviews
American Airlines
7.1
Good
11,621 reviews
Check prices

Comfort

7.2

Overall

7.1

Food

6.4

Entertainment

6.9

Boarding

7.5

Crew

7.9

Reviews

1 / 20
2.0
Mediocre

Anonymous,Mar 2026

MIA - SFO

Horrible. When they power flights for other airlines there is nothing they can do to change or accommodate any changes

Related info for your journey

Find useful and relevant information for your journey from Belfast Intl 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 airport do you fly into for flights to San Francisco from Belfast Intl?

    If you book a flight to San Francisco from Belfast Intl, you will be flying to San Francisco, which is the city’s only airport. San Francisco (SFO) is located 11.0 mi from the center of San Francisco. There are 0 flights from Belfast Intl to San Francisco per day from 2 different airlines.

  • What are the cheapest airlines flying from Belfast Intl Airport to San Francisco round-trip?

    Cheapflights users have booked flights from Belfast Intl Airport to San Francisco round-trip from £424. Another airline that can offer you cheap pricing is American Airlines. Users have found that British Airways is 39% cheaper than the other options available to this destination.

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

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

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

    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.

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

    Yes. Cheapflights offers flight deals from Belfast Intl 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.

See more FAQs

Travelling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Santa Cruz
Newark
San Bruno
Bodega Bay
South San Francisco
Sunnyvale

Browse thousands of different options on Cheapflights for your next trip

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Top 2 airlines flying from Belfast Intl to San Francisco

Discover the top 2 airlines that operate flights from Belfast Intl to San Francisco. 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 19 April 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£424Average£550FlexibilityNo cancel feeOn-time70%
Search British Airways flights
American AirlinesCheapest£469Average£519FlexibilityNo cancel feeOn-time71%
Search American Airlines flights

Fly with Cheapflights

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

Cheapflights makes it easy to find Belfast Intl to San Francisco flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

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

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Belfast Intl to San Francisco for you. Better yet — we are completely free to use.

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

Users can book flights with no change fees policies with our dedicated filters. Book flights from Belfast Intl to San Francisco flexibly with Cheapflights today.

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

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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