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$1,157+ Cheap flights from Belfast Intl (BFS) to San Francisco (SFO)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/20. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — SFO
Jun 22 — Jun 291
Mon 6/22
Mon 6/29
1 adult, Economy
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Cheap flight deals from Belfast Intl to San Francisco

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 May 23, 2026.

This Mytrip deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/207:00 am
BFS
-
SFO
3 stops41h 40m
Multiple Airlines
Fri 7/248:10 am
SFO
-
BFS
3 stops29h 05m
Multiple Airlines
Deal found 5/20$1,157
This Kiwi.com deal was found by Cheapflights users on 5/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/1911:25 am
BFS
-
SFO
1 stop34h 25m
Multiple Airlines
Fri 6/261:00 pm
SFO
-
BFS
2 stops19h 30m
Multiple Airlines
Deal found 5/21$1,420

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 May 23, 2026.

Most accurate provider

eDreams
2 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$1,157
(Mytrip)

Popular in

March

Cheapest in

August

Average price

$739
Provider with most accurate pricing for Belfast Intl-San Francisco flight deals.
Search Deals
Provider most trusted by Cheapflights users for Belfast Intl-San Francisco flights.
Search Deals
From Belfast Intl to San Francisco
Search Deals
Highest demand for flights based on searches. 20% potential increase in price ($256 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease ($82 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

Cheapflights Fare Finder

 
Customize 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 2,558,603 searches. Data last updated May 23, 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 round-trip

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

Mon 7/20

7:00 am-4:40 pm

3 stops41h 40m

San Francisco

Fri 7/24

8:10 am-9:15 pm

3 stops29h 05m

$1,157
Quickest round-trip

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

Fri 6/19

9:05 pm-11:55 pm

3 stops34h 50m

San Francisco

Fri 6/26

6:35 am-2:25 pm

3 stops23h 50m

$1,838

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/20

Sorted by cheapest first

Compare providers for flights from Belfast Intl to San Francisco

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Belfast Intl to San Francisco in May.
ProviderPrice AccuracyTrust Score*
eDreamsPrice Accuracy2 starsTrust Score*3 stars
BudgetAirPrice Accuracy2 starsTrust Score*3 stars
Trip.comPrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Belfast Intl Airport-San Francisco flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Belfast Intl Airport-San Francisco flight deals on Cheapflights vs. eDreams 90-95% of the time. Price accuracy is based on data collected from Belfast Intl Airport-San Francisco flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Belfast Intl Airport-San Francisco flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Belfast Intl Airport-San Francisco flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 round-trip 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 to fly round-trip from Belfast Intl Airport to San Francisco?

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 0 different airlines.

  • 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 vacation 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

Traveling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
South San Francisco
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Santa Clara
Fairfield
Rancho Cordova
San Bruno
Watsonville
San Ramon
Vacaville
Roseville
San Carlos
Redwood City
Sunnyvale
Turlock
Vallejo
San Lorenzo
Davis
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Manteca
Elk Grove

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