What is the cheapest month to book a flight from Belfast Intl Airport to San Francisco?

Currently, January is the cheapest month in which you can book a flight from Belfast Intl Airport to San Francisco (average of $276). Flying from Belfast Intl Airport to San Francisco in June is currently the most expensive (average of $358). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

In terms of precipitation, rainfall in San Francisco ranges from 0.0 - 4.4 inches per month. January is typically the wettest month, when rainfall can reach 4.4 in. July is typically the driest time to visit San Francisco when rainfall is around 0.0 in.

If weather is an important factor for your trip to San Francisco, use this chart to help with planning. For those seeking warmer temperatures, September is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 51.8 F).

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

Our data shows that September tends to be the cheapest month to fly to San Francisco from Belfast Intl Airport. Users have commonly found prices around $743 for the month, but tickets can be as low as $522. Due to multiple factors, prepare for potentially higher prices in December.

What is the cheapest time of day to fly from BFS to SFO?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Belfast Intl Airport to San Francisco as you normally would.

What airport do you fly into for flights to San Francisco from Belfast Intl?

If you book a flight to San Francisco from Belfast Intl, you will be flying to San Francisco, which is the city’s only airport. San Francisco (SFO) is located 11.8 mi from the center of San Francisco. There are 0 flights from Belfast Intl to San Francisco per day from 0 different airlines.

Can I find deals for flights from Belfast Intl to San Francisco that include hotel bookings?

Yes. In addition to deals on Belfast Intl to San Francisco flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Belfast Intl to San Francisco?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Belfast Intl to San Francisco.

Can I find deals for business class flights from Belfast Intl to San Francisco?

Yes. Cheapflights offers flight deals from Belfast Intl to San Francisco by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$451+ Flights from Belfast Intl Airport to San Francisco

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Cheap flight deals from Belfast Intl to San Francisco

Round-trip from	$864 (Kiwi.com)
One-way from	$451 (Kiwi.com)
Popular in	December
Cheapest in	September
Average price	$702

From Belfast Intl to San Francisco

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One-way flight from Belfast Intl to San Francisco

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Highest demand for flights based on searches. 8% potential increase in price ($65 potential increase over avg. RT price).

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Cheapest flight prices on average. 5% potential price decrease ($38 potential savings vs. average RT price).

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Average for round-trip flights in August 2025

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Find flight deals from Belfast Intl to San Francisco

Cheapest flights from Belfast Intl to San Francisco
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 août 14, 2025.

ven. 10/246:05 amBFS - SFO

2 stops22h 33mMultiple Airlines

dim. 11/25:30 pmSFO - BFS

1 stop16h 45mMultiple Airlines

Deal found 8/14

$864

ven. 10/246:05 amBFS - SFO

2 stops22h 33mMultiple Airlines

lun. 11/38:40 pmSFO - BFS

1 stop16h 50mMultiple Airlines

Deal found 8/14

$865

ven. 10/246:15 amBFS - SFO

1 stop21h 05mMultiple Airlines

ven. 10/311:50 pmSFO - BFS

1 stop17h 15mMultiple Airlines

Deal found 8/13

$901

ven. 10/246:05 amBFS - SFO

2 stops22h 33mMultiple Airlines

sam. 11/16:30 pmSFO - BFS

1 stop20h 00mMultiple Airlines

Deal found 8/13

$938

Best flights from Belfast Intl to San Francisco
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 août 14, 2025.

ven. 10/246:05 amBFS - SFO

2 stops22h 33mMultiple Airlines

dim. 11/25:30 pmSFO - BFS

1 stop16h 45mMultiple Airlines

Deal found 8/14

$864

ven. 10/246:05 amBFS - SFO

2 stops22h 33mMultiple Airlines

lun. 11/38:40 pmSFO - BFS

1 stop16h 50mMultiple Airlines

Deal found 8/14

$865

ven. 10/246:15 amBFS - SFO

1 stop21h 05mMultiple Airlines

ven. 10/311:50 pmSFO - BFS

1 stop17h 15mMultiple Airlines

Deal found 8/13

$901

ven. 10/246:05 amBFS - SFO

2 stops22h 33mMultiple Airlines

sam. 11/16:30 pmSFO - BFS

1 stop20h 00mMultiple Airlines

Deal found 8/13

$938

One-way flights from Belfast Intl to San Francisco
Search for one-way flight options from Belfast Intl to San Francisco. Find affordable one-way fares based on user searches. Data last updated août 14, 2025.

sam. 11/110:25 pmBFS - SFO

3 stops53h 45mMultiple Airlines

Deal found 8/13

$451

mar. 10/71:40 pmBFS - SFO

2 stops32h 55mMultiple Airlines

Deal found 8/13

$462

lun. 10/64:10 pmBFS - SFO

3 stops29h 25mMultiple Airlines

Deal found 8/13

$463

mer. 10/84:20 pmBFS - SFO

3 stops30h 10mMultiple Airlines

Deal found 8/13

$482

jeu. 10/96:10 amBFS - SFO

2 stops25h 34mMultiple Airlines

Deal found 8/13

$526

ven. 10/106:05 amBFS - SFO

2 stops22h 33mMultiple Airlines

Deal found 8/13

$553

dim. 10/59:55 amBFS - SFO

2 stops20h 58mMultiple Airlines

Deal found 8/13

$652

Cheapflights Fare Finder

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

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

ven. 10/24

6:05 am-8:38 pm

2 stops22h 33m

San Francisco

dim. 11/2

5:30 pm-6:15 pm

1 stop16h 45m

$864

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

ven. 10/24

6:05 am-8:38 pm

2 stops22h 33m

San Francisco

lun. 11/3

8:40 pm-9:30 pm

1 stop16h 50m

$865

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

ven. 10/24

6:15 am-7:20 pm

1 stop21h 05m

San Francisco

ven. 10/31

1:50 pm-2:05 pm

1 stop17h 15m

$901

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

ven. 10/24

6:05 am-8:38 pm

2 stops22h 33m

San Francisco

sam. 11/1

6:30 pm-9:30 pm

1 stop20h 00m

$938

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

sam. 11/1

10:25 pm-9:10 pm

3 stops53h 45m

$451

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

mar. 10/7

1:40 pm-2:35 pm

2 stops32h 55m

$462

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

lun. 10/6

4:10 pm-1:35 pm

3 stops29h 25m

$463

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

mer. 10/8

4:20 pm-2:30 pm

3 stops30h 10m

$482

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

jeu. 10/9

6:10 am-11:44 pm

2 stops25h 34m

$526

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

ven. 10/10

6:05 am-8:38 pm

2 stops22h 33m

$553

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/13

Showing 1-10 of 11 results

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.

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.

Related info for your journey

What airport do you fly into for flights to San Francisco from Belfast Intl?
If you book a flight to San Francisco from Belfast Intl, you will be flying to San Francisco, which is the city’s only airport. San Francisco (SFO) is located 11.8 mi from the center of San Francisco. There are 0 flights from Belfast Intl to San Francisco per day from 0 different airlines.
Can I find deals for flights from Belfast Intl to San Francisco that include hotel bookings?
Yes. In addition to deals on Belfast Intl to San Francisco flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Belfast Intl to San Francisco?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Belfast Intl to San Francisco.
Can I find deals for business class flights from Belfast Intl to San Francisco?
Yes. Cheapflights offers flight deals from Belfast Intl to San Francisco by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Belfast Intl Airport to San Francisco?
Currently, January is the cheapest month in which you can book a flight from Belfast Intl Airport to San Francisco (average of $276). Flying from Belfast Intl Airport to San Francisco in June is currently the most expensive (average of $358). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Roseville

Santa Cruz

Livermore

South San Francisco

Mountain View

Turlock

Santa Clara

Hollister

Antioch

Watsonville

Manteca

Sunnyvale

Newark

Milpitas

Campbell

Foster City

San Leandro

Burlingame

Redwood City

Vallejo

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$451+ 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 11/1. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Belfast Intl to San Francisco with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Belfast Intl to San Francisco

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Belfast Intl to San Francisco

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 août 14, 2025.

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 août 14, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Belfast Intl Airport to San Francisco that are best for you.

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.

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.

What airport do you fly into for flights to San Francisco from Belfast Intl?

Can I find deals for flights from Belfast Intl to San Francisco that include hotel bookings?

How can I find direct flights from Belfast Intl to San Francisco?

Can I find deals for business class flights from Belfast Intl to San Francisco?

What is the cheapest month to book a flight from Belfast Intl Airport to San Francisco?

Traveling to a place near San Francisco?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Belfast Intl to San Francisco

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Cheapest flights from Belfast Intl to San Francisco
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 août 14, 2025.