SFO - BFS

$819 Find Cheap Flights from San Francisco to Belfast Intl Airport

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from San Francisco to Belfast Intl departing on 11/17. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Belfast Intl Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from San Francisco to Belfast, 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 San Francisco to Belfast, as well as popular online travel agencies
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Flight Deals
Booking Insights
Flight Deals

Cheap Flights from San Francisco to Belfast Intl (SFO-BFS)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from San Francisco to Belfast Intl 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 San Francisco to Belfast Intl

Mon, Nov 17 - Wed, Dec 3
Multiple Airlines Logo
4:35 pm - 8:20 amSFO-BFS
31h 45m2 stops
Multiple Airlines Logo
7:00 am - 2:40 pmBFS-SFO
15h 40m1 stop
$819Multiple Airlines
Find Deal
Mon, Nov 17 - Wed, Dec 3
Multiple Airlines Logo
8:25 am - 4:35 pmSFO-BFS
24h 10m3 stops
Multiple Airlines Logo
6:30 am - 2:40 pmBFS-SFO
16h 10m1 stop
$998Multiple Airlines
Find Deal
Wed, Nov 26 - Wed, Dec 3
Multiple Airlines Logo
4:35 pm - 11:55 pmSFO-BFS
23h 20m3 stops
Multiple Airlines Logo
5:30 pm - 4:45 pmBFS-SFO
31h 15m2 stops
$1,088Multiple Airlines
Find Deal
Wed, Nov 26 - Wed, Dec 3
Multiple Airlines Logo
4:35 pm - 8:20 pmSFO-BFS
19h 45m2 stops
Multiple Airlines Logo
5:30 pm - 4:45 pmBFS-SFO
31h 15m2 stops
$1,230Multiple Airlines
Find Deal
Wed, Nov 26 - Wed, Dec 3
Multiple Airlines Logo
4:35 pm - 11:55 pmSFO-BFS
23h 20m3 stops
Multiple Airlines Logo
7:55 am - 11:05 amBFS-SFO
35h 10m3 stops
$1,357Multiple Airlines
Find Deal

Everything you should know

When to travel
April
Cheapest • 31% price drop
March
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$819
Overall average: $1,405
Multiple Airlines
Mon 11/17Wed 12/3
SFO - BFS • 2 stops
Cheapest one-way
Multiple Airlines
Mon 10/13
SFO - BFS • multi-stop
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Belfast Intl!
Booking Insights

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

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

What is the cheapest month to fly from San Francisco to Belfast Intl Airport?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from San Francisco to Belfast Intl Airport, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from San Francisco to Belfast Intl Airport is April, where tickets cost $622 (return) on average. On the other hand, the most expensive months are November and January, where the average cost of round-trip tickets is $1,405 and $1,339 respectively.

Good to know

Low seasonJanuary
Cheapest flight$819
Best time to beat the crowds but there is an average 47% increase in price.
Most popular time to fly and prices are also 26% lower on average.
Flight from San Francisco to Belfast Intl Airport

When to book flights from San Francisco to Belfast Intl

Are your dates flexible? Find out the best times to travel from San Francisco to Belfast Intl 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 San Francisco to Belfast Intl Airport flights

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

    In the last 3 days, the lowest price for a flight from San Francisco to Belfast Intl Airport was $819 for a round-trip ticket.

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

    Yes, you’ll need a passport to travel to Belfast Intl Airport from San Francisco.

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

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

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

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

  • Which is the best airline for flights from San Francisco to Belfast, American Airlines or British Airways?

    The two airlines most popular with KAYAK users for flights from San Francisco to Belfast are American Airlines and British Airways. With an average price for the route of $845 and an overall rating of 7.2, American Airlines is the most popular choice. British Airways is also a great choice for the route, with an average price of $769 and an overall rating of 6.7.

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

    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 San Francisco to Belfast Intl Airport.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Belfast Intl Airport from San Francisco 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 San Francisco to Belfast Intl Airport?

    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 Belfast Intl Airport with an airline and back to San Francisco with another airline. Booking your flights between San Francisco and BFS can sometimes prove cheaper using this method.

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

    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 Belfast Intl Airport from San Francisco up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from San Francisco to Belfast Intl

 
See real verified KAYAK customer reviews for airlines flying from San Francisco to Belfast. 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 San Francisco to Belfast Intl? 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.
7.2
American AirlinesOverall score based on 11044 reviews
7.5Boarding
6.9Entertainment
6.4Food
7.2Comfort
8.0Crew
Airline reviews

Mostly good. Flight was crowded but Airline personnel were very friendly & accommodating. It would be good to have savory snacks rather than just sweet Biscoff cookies.

8.0 ExcellentMaryann, Oct 2025SFO - CLT
Read more American Airlines reviews

Mostly good. Flight was crowded but Airline personnel were very friendly & accommodating. It would be good to have savory snacks rather than just sweet Biscoff cookies.

It was a red eye flight, so no meals were provided, but it was fine with snacks. The seats felt cramped and almost too narrow.

Very crowded flight but what can you expect these days?? Crew was accommodating.

The seats in economy were appeared to be quite thin and lack sufficient cushioning to be comfortable. Perhaps it was my seating position but the plane seemed notably load.

The entertainment package was vast and the selections were very current. Keep updating it was great.

The seat was so hard my tailbone was aching The crew was kind of a b**** because I made a joke that I didn't care if they close the door I total c*** when she was trying to f****** act like she was mad at me because I said that The flight was bumpy. Sure you didnt have control over that.

4 hours late, including over +1 hour waiting in plane to take off. Baggage left behind too.

While waiting to claim my checked luggage, I discovered the airline had lost it. After a long wait and inquiries, I discovered it was on another flight. Fortunately, the airline finally sent my luggage home.

Was not able to watch most shows on the entertainment site. They would not load

Our flight was 1.5 hours delayed. There was no weather for the inbound flight, so I don't understand why. This meant a VERY late arrival and only a quick nap before my morning flight.

Moved me away from my family and refused to fix it.

I have always been pleased with their service. Would not change a thing

Seating and food was the worst we have experienced in 35 years of traveling for both personal and busines .

Economy seats felt more cramped than other flights we have taken.7 hr, painful sitting hours 6 and 7. Web site difficult to deal with. Originally put in for 1 special meal due to type 2. Meal was awful. Tried to change selection to standard for return flight, on app and website, unable to complete that action.

I was sleeping during dinner service, no one bothered to offer meal later, I remained hungry….until I got a morning sandwich!

Need to offer Better food from LAX to London Service from London to Delhi very delayed after take off.

Great crew and food and beverage. Seating tight but not the airline's fault. Will definitely fly BA in future!

The flight was very delayed in taking off - which was out of control of the crew, but then the pilot worked hard so we only arrived about 30 minutes late. Everyone was very friendly and accommodating!

Crying baby the ENTIRE flight. Not your fault, but I paid 2700 for a premium economy ticket and it wasn't worth it. should have just stuck with coach. flight attendants very mediocre - minimal effort. Plane didn't seem very clean. Didn't have any cleansing wipes - most airlines give you this when you board. Flat screen scrolling didn't work. Toiletry case a joke - why bother at all?

Enjoyable flight, helpful crew everything was organized to accommodate passengers.

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

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