$519 Find Cheap Flights from Belfast to San Francisco

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Belfast to San Francisco departing on 3/17. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to San Francisco

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Belfast to San Francisco, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Belfast to San Francisco, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$812
British Airways
Fri 4/24Tue 4/28
BHD - SFO • 1 stop
Cheapest one-way
$519
Multiple Airlines
Tue 3/17
BHD - SFO • 2 stops
Top airlines
British Airways
Cheapest • from $812 (round-trip)
British Airways
Best reviews • 6.7 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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We hope you love your trip to San Francisco!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Belfast to San Francisco

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Belfast to San Francisco that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Belfast to San Francisco

Fri, Apr 24 - Tue, Apr 28
British Airways Logo
6:30 am - 1:50 pm
BHD
-
SFO
15h 20m
1 stop
British Airways Logo
1:28 pm - 3:20 pm
SFO
-
BHD
17h 52m
2 stops
$812British Airways
Fri, Apr 24 - Tue, Apr 28
British Airways Logo
7:35 pm - 1:50 pm
BHD
-
SFO
26h 15m
1 stop
British Airways Logo
1:28 pm - 3:20 pm
SFO
-
BHD
17h 52m
2 stops
$813British Airways
Mon, May 18 - Mon, Jun 1
British Airways Logo
6:30 am - 1:50 pm
BHD
-
SFO
15h 20m
1 stop
British Airways Logo
4:45 pm - 6:45 pm
SFO
-
BHD
18h 00m
2 stops
$843British Airways
Fri, Apr 24 - Tue, Apr 28
British Airways Logo
6:30 am - 1:50 pm
BHD
-
SFO
15h 20m
1 stop
British Airways Logo
7:30 pm - 6:55 pm
SFO
-
BHD
15h 25m
1 stop
$853British Airways
Fri, Apr 24 - Tue, Apr 28
British Airways Logo
6:30 am - 7:20 pm
BHD
-
SFO
20h 50m
2 stops
British Airways Logo
4:15 pm - 6:55 pm
SFO
-
BHD
18h 40m
2 stops
$859British Airways
Mon, May 18 - Mon, Jun 1
Multiple Airlines Logo
6:30 am - 7:31 pm
BHD
-
SFO
21h 01m
2 stops
Multiple Airlines Logo
1:35 pm - 5:30 pm
SFO
-
BHD
19h 55m
2 stops
$868Multiple Airlines
Fri, May 1 - Sat, May 16
KLM Logo
9:50 am - 11:45 am
BHD
-
SFO
33h 55m
1 stop
KLM Logo
1:45 pm - 9:20 am
SFO
-
BHD
35h 35m
1 stop
$873KLM
Fri, Apr 24 - Tue, Apr 28
British Airways Logo
6:30 am - 5:40 pm
BHD
-
SFO
19h 10m
2 stops
British Airways Logo
4:15 pm - 6:55 pm
SFO
-
BHD
18h 40m
2 stops
$878British Airways
Fri, Mar 13 - Mon, Mar 16
British Airways Logo
6:45 am - 11:57 pm
BHD
-
SFO
24h 12m
2 stops
British Airways Logo
9:55 pm - 10:30 am
SFO
-
BHD
29h 35m
2 stops
$882British Airways
Fri, Mar 13 - Mon, Mar 16
British Airways Logo
6:45 am - 10:41 pm
BHD
-
SFO
22h 56m
2 stops
British Airways Logo
6:15 am - 10:40 am
SFO
-
BHD
21h 25m
2 stops
$883British Airways
Booking Insights

KAYAK's insights & trends for Belfast to San Francisco flights

Get data-powered insights and trends into flights from Belfast to San Francisco to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Belfast to San Francisco?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Belfast to San Francisco were found on British Airways ($812) and KLM ($873).

Good to know

Cheapest flight$519
Flight from Belfast City Airport to San Francisco

When to book flights from Belfast to San Francisco

Are your dates flexible? Find out the best times to travel from Belfast to San Francisco based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Belfast to San Francisco

  • What is the cheapest flight from Belfast to San Francisco?

    In the last 3 days, the lowest price for a flight from Belfast to San Francisco was $519 for a one-way ticket and $812 for a round-trip.

  • Do I need a passport to fly between Belfast and San Francisco?

    Yes

  • Which airports will I be using when flying from Belfast to San Francisco?

    Belfast has 2 major airports: Belfast Intl and Belfast City. San Francisco is the only airport in San Francisco. You’ll usually find the cheapest deals if you fly from Belfast City Airport.

  • Which aircraft models fly most regularly from Belfast to San Francisco?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Belfast to San Francisco?

    oneworld is the only airline alliance operating flights between Belfast and San Francisco.

  • How does KAYAK find such low prices on flights from Belfast to San Francisco?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Belfast to San Francisco.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Belfast to San Francisco?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Francisco from Belfast is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Belfast to San Francisco?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Francisco with an airline and back to Belfast with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Belfast to San Francisco?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Francisco from Belfast up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Belfast to San Francisco

 
See real verified KAYAK customer reviews for airlines flying from Belfast to San Francisco. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Belfast to San Francisco? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
6.7
British AirwaysOverall score based on 7762 reviews
6.4Food
6.9Boarding
7.6Crew
6.4Entertainment
6.8Comfort
Airline reviews

Late takeoff, but on time landing. Lost bags, 3 days to find them, still in transit to my location. Power outlets broken, Wi-Fi not working, so much for working on the long flight.

4.0 OkayDaniel, Feb 2026
LHR - BWI
Read more British Airways reviews

Late takeoff, but on time landing. Lost bags, 3 days to find them, still in transit to my location. Power outlets broken, Wi-Fi not working, so much for working on the long flight.

Good. For a long flight. The comfort of the seat could be better. Also, the food was « normal » plane food. Not indian plane food unfortunately! Everything else was smooth and great.

The seats were comfortable. So many empty seats allowed for stretching out and sleeping. The onboard entertainment was pretty good. The cabin crew were so kind and kept the passengers well- hydrated, and well fed.

We had American Airlines on our return and it was confusing if we were going with Aa or BA I had 2 different flight numbers and didn’t get our gate until it was boarding. So we were a bit nervous as the which it was

My touch screen at my seat wasn't working, the films BA advertised on the website for this flight were not available, and the plane was a little dated, food was good and the staff were good, just let down by the aircraft facilities.

Did not like the seating configuration at all with 2+3+2 in business class. Lacking total privacy and comfort

Check-in experience, for business call please provide a premium experience

Lost my luggage, ran out of food choices in business class, ground crew was completely unapologetic.

Excellent. The crew and flight were great. Checking in was easy and everyone was very helpful.

Entertainment devices on A380 need to be fixed, the seats might do with updates.

Everything you need to know for your flight from Belfast to San Francisco

Information on your arrival and departure airports