SFO - BFS

$334 Find Cheap Flights from San Francisco to Belfast Intl Airport

This is the cheapest one-way 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 9/15. 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

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, Sep 15 - Mon, Sep 22
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6:15 am - 8:35 pmSFO-BFS
30h 20m2 stops
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6:45 am - 12:50 pmBFS-SFO
38h 05m2 stops
Mon, Sep 15 - Mon, Sep 22
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4:05 pm - 8:35 pmSFO-BFS
20h 30m1 stop
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6:45 am - 12:50 pmBFS-SFO
38h 05m2 stops
Mon, Sep 15 - Mon, Sep 22
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4:05 pm - 8:35 pmSFO-BFS
20h 30m1 stop
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6:45 am - 7:30 pmBFS-SFO
20h 45m1 stop
Mon, Oct 13 - Mon, Oct 27
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5:40 pm - 8:55 pmSFO-BFS
19h 15m2 stops
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9:30 pm - 4:35 pmBFS-SFO
26h 05m2 stops
Mon, Sep 15 - Mon, Sep 22
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10:15 am - 7:05 pmSFO-BFS
24h 50m2 stops
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9:25 am - 1:35 pmBFS-SFO
36h 10m3 stops
Sat, Oct 11 - Fri, Oct 17
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8:30 pm - 12:10 pmSFO-BFS
31h 40m1 stop
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4:25 pm - 6:10 pmBFS-SFO
33h 45m2 stops
Thu, Oct 2 - Thu, Oct 9
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7:30 pm - 11:30 pmSFO-BFS
20h 00m2 stops
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9:55 pm - 12:40 pmBFS-SFO
22h 45m2 stops
Mon, Oct 13 - Mon, Oct 27
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4:20 pm - 11:00 pmSFO-BFS
22h 40m2 stops
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7:50 am - 3:30 pmBFS-SFO
38h 40m3 stops
Thu, Oct 2 - Thu, Oct 9
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7:30 am - 4:15 pmSFO-BFS
24h 45m3 stops
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9:05 pm - 8:50 pmBFS-SFO
31h 45m2 stops
Fri, Oct 10 - Fri, Oct 17
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1:05 pm - 3:05 pmSFO-BFS
18h 00m1 stop
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6:05 am - 7:20 pmBFS-SFO
21h 15m1 stop
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 October, where tickets cost $588 (return) on average. On the other hand, the most expensive months are January and November, where the average cost of round-trip tickets is $1,339 and $1,175 respectively.

Good to know

Low seasonJanuary
Cheapest flight$334
Best time to beat the crowds but there is an average 48% increase in price.
Most popular time to fly and prices are also 22% 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 $334 for a one-way ticket and $726 for a round-trip.

  • 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.

  • 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 10000 reviews
7.2Comfort
6.9Entertainment
6.5Food
7.5Boarding
8.0Crew
Airline reviews

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

2.0 MediocreAnonymous, Aug 2025SBP - DFW
Read more American Airlines reviews

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.

Delayed flight, so I switched fights to SFO to Phoenix , Phoenix to DSM. Excellent service through American Airlines

AA re-routed flight from HNL to LAX due to delay. My group of 3 with reserved seats in row 9 was broken up, with one assigned to a middle seat, another in the last row of the plane. Not happy. No explanation to the delay. No apologies. No compensation. Would have been nice to be offered an Admiral Club admission or a voucher for the extra 3 hours of layover in LAX. Could not hear the boarding gate announcements in LAX. Adjacent gate was boarding at the same time. Loud speakers were competing against each other. Barely made my boarding group.

Almost a 6 hour flight and the only food option is a cheese plate… and chips. Also how is it there are no options for texting on American. I’ll be going back to delta and united.

Bad food, small seats that didn’t recline. I thought I was buying a quantas ticket so I feel like I got scammed

The chair cushions may need an upgrade. I have been noticing they are so worn out, thin so you’d sit in a dip 😄. Other than that, all was an enjoyable trip. Thanks AA!

Cramped seats. FAA should make airlines have more legroom, for even short people complain

Very caring crew on board. Didn’t have dinner as I was sleeping. Was seating in the emergency row so I had comfortable leg room

Had a nice little suite although I couldn’t close the door (but I didn’t ask anyone to help). 5K is a nice seat and very private (you look in on first class). Enjoyable flight and nice crew.

Although the crew were great and the good nice, I might as well have been on Ryanair for the amount of space I had. Not good enough BA. I’d rather pay more and not feel like a human sardine.

Love the A380 - loads of room. Headphone socket on my seat didn’t work. Sounds like a trivial issue? Well when flying long-haul the in-flight entertainment is what keeps you going so when it doesn’t work it’s a disaster. Pay attention to the details please BA. Spoiled what was otherwise an excellent flight with the usual brilliant crew.

Crew were fantastic can’t fault them at all. Couldn’t do enough for us

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?

The overall seat and cushion needs to be updated. It was hard and no support. My butt was numb for most of the flight. The food was subpar at best being in premium economy cost. The flight attendants were excellent and attentive during the whole flight. Disappointed I had to select our seats 24 hours prior.

I enjoyed the comfort of Premium Economy. The Purser on London-Nairobi was a little testy, snappish in his tone. I understand stressed, tired, etc but his tone in addressing passengers I found wanting.

Very good crew. The seating in economy plus was excellent, and I slept most of the way. The diabetic meal that I requested was almost tasteless--about a 2 on a ten-point scale.--so I ate little. And why bother serving dinner to fliers at midnight?! I had eaten a meal at the airport six hours earlier. A good breakfast would be better.

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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