$397+ Cheap flights from Belfast Intl (BFS) to San Francisco (SFO)
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 4/28. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — SFO
Apr 23 — Apr 301
Round-trip
1 adult, Economy
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Find cheap flights from Belfast Intl to San Francisco with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Belfast Intl to San Francisco
Cheapest
Best
Last-minute
One-way
Cheapest flights from Belfast Intl to San FranciscoExplore 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 March 24, 2026.
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 March 24, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/22. 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.
Sun 4/196:10 am
BFS
- SFO
1 stop19h 45m
Multiple Airlines
Sun 4/267:40 pm
SFO
- BFS
2 stops30h 15m
Multiple Airlines
Deal found 3/22![Multiple Airlines logo]()
$1,023
This Mytrip deal was found by Cheapflights users on 3/20. 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.
Tue 5/59:10 pm
BFS
- SFO
3 stops46h 50m
Multiple Airlines
Tue 5/122:40 pm
SFO
- BFS
2 stops24h 20m
Multiple Airlines
Deal found 3/20![Multiple Airlines logo]()
$1,108
Best flights from Belfast Intl to San FranciscoDiscover carefully curated flight deals from Belfast Intl to San Francisco that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 24, 2026.
Discover carefully curated flight deals from Belfast Intl to San Francisco that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 24, 2026.
This Booking.com deal was found by Cheapflights users on 3/22. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/195:05 pm
BFS
- SFO
2 stops29h 35m
Multiple Airlines
Sun 4/264:45 pm
SFO
- BFS
2 stops20h 45m
Multiple Airlines
Deal found 3/22![Multiple Airlines logo]()
$1,025
This Mytrip deal was found by Cheapflights users on 3/20. 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.
Tue 5/59:10 pm
BFS
- SFO
3 stops46h 50m
Multiple Airlines
Tue 5/122:40 pm
SFO
- BFS
2 stops24h 20m
Multiple Airlines
Deal found 3/20![Multiple Airlines logo]()
$1,108
Last-minute flights from Belfast Intl to San FranciscoDiscover last-minute flight deals from Belfast Intl to San Francisco. Data last updated March 24, 2026 and is based on user searches.
Discover last-minute flight deals from Belfast Intl to San Francisco. Data last updated March 24, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 3/22. 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.
Sun 4/196:10 am
BFS
- SFO
1 stop19h 45m
Multiple Airlines
Sun 4/267:40 pm
SFO
- BFS
2 stops30h 15m
Multiple Airlines
Deal found 3/22![Multiple Airlines logo]()
$1,023
One-way flights from Belfast Intl to San FranciscoSearch for one-way flight options from Belfast Intl to San Francisco. Find affordable one-way fares based on user searches. Data last updated March 24, 2026.
Search for one-way flight options from Belfast Intl to San Francisco. Find affordable one-way fares based on user searches. Data last updated March 24, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/287:00 am
BFS
- SFO
3 stops37h 00m
Multiple Airlines
Deal found 3/20![Multiple Airlines logo]()
$397
This Kiwi.com deal was found by Cheapflights users on 3/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/303:55 pm
BFS
- SFO
3 stops52h 05m
Multiple Airlines
Deal found 3/20![Multiple Airlines logo]()
$404
This Kiwi.com deal was found by Cheapflights users on 3/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/144:40 pm
BFS
- SFO
3 stops57h 15m
Multiple Airlines
Deal found 3/20![Multiple Airlines logo]()
$417
This Kiwi.com deal was found by Cheapflights users on 3/19. 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.
Sun 5/39:35 am
BFS
- SFO
3 stops44h 20m
Multiple Airlines
Deal found 3/19![Multiple Airlines logo]()
$419
This Kiwi.com deal was found by Cheapflights users on 3/22. 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.
Sun 4/1910:10 pm
BFS
- SFO
3 stops46h 00m
Multiple Airlines
Deal found 3/22![Multiple Airlines logo]()
$420
This Kiwi.com deal was found by Cheapflights users on 3/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/78:10 pm
BFS
- SFO
3 stops53h 45m
Multiple Airlines
Deal found 3/20![Multiple Airlines logo]()
$455
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 March 24, 2026.
Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Round-trip from | $1,023 (Kiwi.com) |
One-way from | $397 (Kiwi.com) |
Popular in | March |
Cheapest in | September |
Average price | $1,400 |
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 March 24, 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
Cheapest round-trip
Quickest round-trip
BelfastSan Francisco
BFS - SFO
BFSSFO
Belfast Intl
Sun 4/19
5:05 pm-2:40 pm
2 stops29h 35m
San Francisco
Sun 4/26
4:45 pm-9:30 pm
2 stops20h 45m
$1,025
BelfastSan Francisco
BFS - SFO
BFSSFO
Belfast Intl
Tue 5/5
9:10 pm-12:00 pm
3 stops46h 50m
San Francisco
Tue 5/12
2:40 pm-11:00 pm
2 stops24h 20m
$1,108
Cheapest one-way
Quickest one-way
BelfastSan Francisco
BFS - SFO
BFSSFO
Belfast Intl
Tue 4/28
7:00 am-12:00 pm
3 stops37h 00m
$397
BelfastSan Francisco
BFS - SFO
BFSSFO
Belfast Intl
Thu 4/30
3:55 pm-12:00 pm
3 stops52h 05m
$404
BelfastSan Francisco
BFS - SFO
BFSSFO
Belfast Intl
Tue 4/14
4:40 pm-5:55 pm
3 stops57h 15m
$417
BelfastSan Francisco
BFS - SFO
BFSSFO
Belfast Intl
Sun 4/19
10:10 pm-12:10 pm
3 stops46h 00m
$420
BelfastSan Francisco
BFS - SFO
BFSSFO
Belfast Intl
Sun 5/3
6:10 am-12:00 pm
2 stops37h 50m
$497
BelfastSan Francisco
BFS - SFO
BFSSFO
Belfast Intl
Tue 4/7
8:10 pm-12:45 pm
2 stops48h 35m
$555
BelfastSan Francisco
BFS - SFO
BFSSFO
Belfast Intl
Sun 7/5
10:10 pm-3:55 pm
3 stops49h 45m
$700
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 March.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- 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 >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.
BFS-SFO
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.
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 March 24, 2026.
See what other customers who have flown with British Airways from Belfast Intl Airport to San Francisco have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
7.6
Entertainment
6.4
Boarding
6.9
Comfort
6.8
Food
6.4
Overall
6.7
Reviews
1 / 20
6.0
GoodRoxanne,Sep 2025
LHR - IAD
Crew
7.6
Entertainment
6.4
Boarding
6.9
Comfort
6.8
Food
6.4
Overall
6.7
Reviews
1 / 20
6.0
GoodRoxanne,Sep 2025
LHR - IAD
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.
Traveling to a place near San Francisco?
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Belfast Intl and San Francisco flights
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Top airline flying from Belfast Intl to San Francisco
Discover the top airline 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 2,558,603 searches. Data last updated March 24, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$542 | Average$1,706 | FlexibilityNo cancel fee | On-time70% |