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Cheap flights from Belfast Intl Airport to San Francisco from $904

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Belfast Intl Airport to San Francisco departing on 9/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Belfast Intl Airport to San Francisco

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
4:35 pm - 2:40 pmBFS  Belfast Intl-SFO San Francisco
30h 05m2 stops Birmingham Kastrup Copenhagen
Multiple Airlines Logo
4:45 pm - 11:00 pmSFO  San Francisco-BFS Belfast Intl
22h 15m2 stops Kastrup Copenhagen Birmingham
$904Multiple Airlines
Wed, Sep 9 - Tue, Sep 15
Multiple Airlines Logo
9:10 pm - 9:49 pmBFS  Belfast Intl-SFO San Francisco
32h 39m2 stops London Gatwick Toronto Pearson Intl
Multiple Airlines Logo
8:10 am - 9:55 pmSFO  San Francisco-BFS Belfast Intl
29h 45m3 stops Montreal Pierre Elliott Trudeau Intl Barcelona-El Prat London Stansted
$938Multiple Airlines
Sun, Sep 20 - Sun, Sep 27
Multiple Airlines Logo
8:15 pm - 9:49 pmBFS  Belfast Intl-SFO San Francisco
33h 34m2 stops London Gatwick Toronto Pearson Intl
Multiple Airlines Logo
8:10 am - 9:55 pmSFO  San Francisco-BFS Belfast Intl
29h 45m3 stops Montreal Pierre Elliott Trudeau Intl Barcelona-El Prat London Stansted
$939Multiple Airlines
Fri, Sep 18 - Sun, Sep 27
Multiple Airlines Logo
6:05 am - 9:49 pmBFS  Belfast Intl-SFO San Francisco
47h 44m3 stops London Gatwick Montreal Pierre Elliott Trudeau Intl Toronto Pearson Intl
Multiple Airlines Logo
8:10 am - 3:20 pmSFO  San Francisco-BFS Belfast Intl
23h 10m3 stops Montreal Pierre Elliott Trudeau Intl Barcelona-El Prat Nottingham East Midlands
$969Multiple Airlines
Fri, Sep 18 - Sun, Sep 27
Multiple Airlines Logo
9:10 pm - 9:55 pmBFS  Belfast Intl-SFO San Francisco
32h 45m3 stops London Gatwick Toronto Pearson Intl Calgary
Multiple Airlines Logo
8:10 am - 9:55 pmSFO  San Francisco-BFS Belfast Intl
29h 45m3 stops Montreal Pierre Elliott Trudeau Intl Barcelona-El Prat London Stansted
$991Multiple Airlines
Sun, Sep 20 - Sun, Sep 27
Multiple Airlines Logo
8:55 pm - 11:45 amBFS  Belfast Intl-SFO San Francisco
22h 50m2 stops Birmingham Amsterdam Schiphol
Multiple Airlines Logo
3:05 pm - 7:20 pmSFO  San Francisco-BFS Belfast Intl
20h 15m2 stops Paris Charles de Gaulle Birmingham
$1,026Multiple Airlines
Mon, Sep 7 - Mon, Sep 14
Multiple Airlines Logo
6:15 am - 10:20 amBFS  Belfast Intl-SFO San Francisco
36h 05m3 stops Paris Charles de Gaulle Calgary Vancouver Intl
Multiple Airlines Logo
8:30 am - 3:15 pmSFO  San Francisco-BFS Belfast Intl
22h 45m2 stops Toronto Pearson Intl Manchester
$1,036Multiple Airlines
Wed, Sep 9 - Tue, Sep 15
Multiple Airlines Logo
6:10 am - 9:59 pmBFS  Belfast Intl-SFO San Francisco
47h 49m3 stops London Gatwick Montreal Pierre Elliott Trudeau Intl Toronto Pearson Intl
Multiple Airlines Logo
3:05 pm - 11:05 pmSFO  San Francisco-BFS Belfast Intl
24h 00m2 stops Paris Charles de Gaulle Edinburgh Turnhouse
$1,057Multiple Airlines
Mon, Sep 7 - Mon, Sep 14
Multiple Airlines Logo
9:10 pm - 9:49 pmBFS  Belfast Intl-SFO San Francisco
32h 39m2 stops London Gatwick Toronto Pearson Intl
Multiple Airlines Logo
1:45 pm - 5:25 pmSFO  San Francisco-BFS Belfast Intl
19h 40m2 stops Amsterdam Schiphol Edinburgh Turnhouse
$1,080Multiple Airlines
Sun, Sep 20 - Sun, Sep 27
Multiple Airlines Logo
6:15 am - 11:20 pmBFS  Belfast Intl-SFO San Francisco
25h 05m3 stops Paris Charles de Gaulle Calgary Vancouver Intl
Multiple Airlines Logo
11:35 am - 11:00 pmSFO  San Francisco-BFS Belfast Intl
27h 25m3 stops Toronto Pearson Intl Frankfurt am Main Birmingham
$1,098Multiple Airlines
Wed, Sep 9 - Tue, Sep 15

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Customize your flight search to find flights from Belfast Intl Airport 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, momondo users made 832,500 searches. Data last updated August 12, 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 Belfast Intl - SFO San Francisco

BFSSFO

Belfast Intl

Wed 9/9

4:35 pm-2:40 pm

2 stops30h 05m

San Francisco

Tue 9/15

4:45 pm-11:00 pm

2 stops22h 15m

$904

BelfastSan Francisco

BFS Belfast Intl - SFO San Francisco

BFSSFO

Belfast Intl

Sun 9/20

9:10 pm-9:49 pm

2 stops32h 39m

San Francisco

Sun 9/27

8:10 am-9:55 pm

3 stops29h 45m

$938

BelfastSan Francisco

BFS Belfast Intl - SFO San Francisco

BFSSFO

Belfast Intl

Fri 9/18

8:15 pm-9:49 pm

2 stops33h 34m

San Francisco

Sun 9/27

8:10 am-9:55 pm

3 stops29h 45m

$939

BelfastSan Francisco

BFS Belfast Intl - SFO San Francisco

BFSSFO

Belfast Intl

Fri 9/18

6:05 am-9:49 pm

3 stops47h 44m

San Francisco

Sun 9/27

8:10 am-3:20 pm

3 stops23h 10m

$969

BelfastSan Francisco

BFS Belfast Intl - SFO San Francisco

BFSSFO

Belfast Intl

Sun 9/20

9:10 pm-9:55 pm

3 stops32h 45m

San Francisco

Sun 9/27

8:10 am-9:55 pm

3 stops29h 45m

$991
Quickest round-trip

BelfastSan Francisco

BFS Belfast Intl - SFO San Francisco

BFSSFO

Belfast Intl

Mon 9/7

8:55 pm-11:45 am

2 stops22h 50m

San Francisco

Mon 9/14

3:05 pm-7:20 pm

2 stops20h 15m

$1,026

BelfastSan Francisco

BFS Belfast Intl - SFO San Francisco

BFSSFO

Belfast Intl

Wed 9/9

6:15 am-10:20 am

3 stops36h 05m

San Francisco

Tue 9/15

8:30 am-3:15 pm

2 stops22h 45m

$1,036

BelfastSan Francisco

BFS Belfast Intl - SFO San Francisco

BFSSFO

Belfast Intl

Mon 9/7

6:10 am-9:59 pm

3 stops47h 49m

San Francisco

Mon 9/14

3:05 pm-11:05 pm

2 stops24h 00m

$1,057

BelfastSan Francisco

BFS Belfast Intl - SFO San Francisco

BFSSFO

Belfast Intl

Sun 9/20

9:10 pm-9:49 pm

2 stops32h 39m

San Francisco

Sun 9/27

1:45 pm-5:25 pm

2 stops19h 40m

$1,080

BelfastSan Francisco

BFS Belfast Intl - SFO San Francisco

BFSSFO

Belfast Intl

Wed 9/9

6:15 am-11:20 pm

3 stops25h 05m

San Francisco

Tue 9/15

11:35 am-11:00 pm

3 stops27h 25m

$1,098

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to San Francisco from

How to get the cheapest flight ticket from Belfast Intl Airport to San Francisco

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to San Francisco?

If you aren’t able to travel to San Francisco during the month of November, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $0.

When to book flights from Belfast Intl Airport to San Francisco

Are you open to changing your travel dates? Check out the ideal times to fly from Belfast Intl Airport to San Francisco according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Belfast Intl Airport to San Francisco (BFS to SFO) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Belfast Intl Airport to San Francisco

Fastest flight time

15h 15m

Direct flights

None
The fastest flight from Belfast Intl Airport to San Francisco takes 15h 15m
There are no direct flights from Belfast Intl Airport to San Francisco. There are no popular flight routes from Belfast Intl Airport to San Francisco.
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Frequently asked questions about flying from Belfast Intl Airport to San Francisco

  • How far is Belfast Intl to San Francisco by plane?

    Belfast Intl and San Francisco are 5017.1 mi apart from one another. By plane, this route typically takes 15h 15m.

  • When did momondo last update prices for flights from Belfast Intl Airport to San Francisco Airport?

    Prices for flights from Belfast Intl Airport to San Francisco Airport were last updated today.

  • How old do you have to be to fly from Belfast Intl Airport to San Francisco Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Belfast Intl Airport to San Francisco Airport.

  • What documentation or ID do you need to fly to San Francisco Airport?

    The necessary travel and health documents for your San Francisco Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Traveling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Santa Cruz
Carmel-by-the-Sea
Modesto
South San Francisco
Fremont
Berkeley
Bodega Bay
Hayward
Walnut Creek
Santa Clara
Vallejo
Roseville
Sonoma
Salinas
Sunnyvale
Milpitas
Daly City
Burlingame
Marina
Palo Alto

Why use momondo?

Why should I use momondo to find a flight deal from Belfast to San Francisco?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Belfast to San Francisco for you.

Can I find flights from Belfast to San Francisco with flexible booking policies on momondo?

Flights from Belfast to San Francisco with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Belfast to San Francisco?

momondo provides multiple filters to help you find the best flight to San Francisco from Belfast. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Belfast to San Francisco right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Belfast to San Francisco flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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