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Cheap flights from Belfast Intl Airport to San Francisco from £310

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 14/6. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — SFO
29 Mar — 5 Apr1
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 27 February 2026.

Thu 21/520:05
BFS
-
SFO
2 stops33h 50m
Multiple Airlines
Tue 2/619:45
SFO
-
BFS
1 stop30h 00m
Multiple Airlines
Deal found 23/2£832
Mon 18/513:40
BFS
-
SFO
2 stops32h 55m
Multiple Airlines
Mon 1/613:45
SFO
-
BFS
2 stops25h 20m
Multiple Airlines
Deal found 23/2£837
Thu 26/306:15
BFS
-
SFO
2 stops41h 50m
Multiple Airlines
Thu 2/417:55
SFO
-
BFS
1 stop21h 05m
Multiple Airlines
Deal found 26/2£874
Sun 12/422:00
BFS
-
SFO
3 stops31h 22m
Multiple Airlines
Sun 19/416:45
SFO
-
BFS
3 stops17h 40m
Multiple Airlines
Deal found 26/2£875
Fri 1/521:30
BFS
-
SFO
3 stops46h 30m
Multiple Airlines
Sat 16/508:30
SFO
-
BFS
3 stops30h 35m
Multiple Airlines
Deal found 22/2£883

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 27 February 2026.

Round-trip from

£832

One-way from

£310

Popular in

July

Cheapest in

September

Average price

£880
21/5-2/6
  • 21/5-2/6
  • 3 total stops
  • 63h 50m total
  • Belfast to San Francisco
Search Deals
14/6
  • 14/6
  • 3 total stops
  • 46h 45m total
  • Belfast to San Francisco
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (£24 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease (£28 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 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 27 February 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

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

Thu 21/5

20:05-21:55

2 stops33h 50m

San Francisco

Tue 2/6

19:45-09:45

1 stop30h 00m

£832

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

Mon 18/5

13:40-14:35

2 stops32h 55m

San Francisco

Mon 1/6

13:45-23:05

2 stops25h 20m

£837

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

Thu 26/3

06:15-17:05

2 stops41h 50m

San Francisco

Thu 2/4

17:55-23:00

1 stop21h 05m

£874

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

Sun 12/4

22:00-21:22

3 stops31h 22m

San Francisco

Sun 19/4

16:45-18:25

3 stops17h 40m

£875

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

Fri 1/5

21:30-12:00

3 stops46h 30m

San Francisco

Sat 16/5

08:30-23:05

3 stops30h 35m

£883

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

Fri 10/4

22:10-21:21

3 stops31h 11m

San Francisco

Fri 17/4

15:15-23:20

3 stops24h 05m

£1,002

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

Sun 14/6

22:00-13:50

2 stops47h 50m

£331

Flights are sorted by cheapest return flights first.

Deals found on 24/2

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 27 February 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
7.2
Good
11,357 reviews
Check prices

Food

6.4

Comfort

7.2

Boarding

7.5

Crew

8.0

Entertainment

6.9

Overall

7.2

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
11,357 reviews
American Airlines
7.2
Good
11,357 reviews
Check prices

Food

6.4

Comfort

7.2

Boarding

7.5

Crew

8.0

Entertainment

6.9

Overall

7.2

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
7,772 reviews
American Airlines
7.2
Good
11,357 reviews
Check prices

Food

6.4

Comfort

7.2

Boarding

7.5

Crew

8.0

Entertainment

6.9

Overall

7.2

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. 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 11.8 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 £407. Another airline that can offer you cheap pricing is American Airlines. Users have found that British Airways is 36% 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 27 February 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£407Average£518FlexibilityNo cancel feeOn-time70%
Search British Airways flights
American AirlinesCheapest£468Average£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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