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Northern Ireland

$176+ Cheap flights from California to Northern Ireland

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 2/23. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — BFS
Feb 11 — Feb 181
Wed 2/11
Wed 2/18
1 adult, Economy
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Cheap flight deals from California to Northern Ireland

Keep the following information in mind while searching for California to Northern Ireland flight deals. Data was last updated January 12, 2026.

Round-trip from

$571
(oojo)

One-way from

$176
(oojo)

Popular in

June

Cheapest in

October

Average price

$700
From California to Northern Ireland
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One-way flight from California to Northern Ireland
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Highest demand for flights based on searches. 16% potential increase in price ($184 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($39 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Find flight deals from California to Northern Ireland

Cheapest flights from California to Northern Ireland
Explore the most affordable flight options available from California to Northern Ireland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 12, 2026.

This oojo deal was found by Cheapflights users on 1/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/251:50 pm
SFO
-
BHD
2 stops16h 25m
British Airways
Wed 3/49:15 am
BHD
-
SFO
1 stop17h 30m
British Airways
Deal found 1/10$571
This British Airways deal was found by Cheapflights users on 1/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/85:30 pm
SFO
-
BHD
1 stop15h 20m
British Airways
Tue 2/2411:25 am
BHD
-
SFO
1 stop35h 35m
British Airways
Deal found 1/11$575
This oojo deal was found by Cheapflights users on 1/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/108:40 pm
SFO
-
BHD
1 stop27h 35m
British Airways
Tue 2/178:45 am
BHD
-
SFO
1 stop14h 15m
British Airways
Deal found 1/12$583
This oojo deal was found by Cheapflights users on 1/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/1411:35 am
SFO
-
BHD
2 stops17h 20m
British Airways
Thu 9/246:35 am
BHD
-
SFO
1 stop15h 15m
British Airways
Deal found 1/11$587
This American Airlines deal was found by Cheapflights users on 1/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/107:30 am
SFO
-
BHD
2 stops19h 00m
American Airlines
Tue 2/178:45 am
BHD
-
SFO
2 stops19h 29m
American Airlines
Deal found 1/12$589
This British Airways deal was found by Cheapflights users on 1/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/256:00 pm
LAX
-
BHD
1 stop14h 35m
British Airways
Sun 3/18:25 pm
BHD
-
LAX
1 stop25h 05m
British Airways
Deal found 1/11$602
This Cheapflightsfares deal was found by Cheapflights users on 1/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/88:40 pm
SFO
-
BHD
1 stop14h 00m
British Airways
Sun 2/159:10 am
BHD
-
SFO
1 stop13h 50m
British Airways
Deal found 1/11$605
This oojo deal was found by Cheapflights users on 1/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/236:30 am
LAX
-
BHD
2 stops20h 00m
British Airways
Tue 2/36:35 am
BHD
-
LAX
2 stops20h 57m
British Airways
Deal found 1/10$625
This American Airlines deal was found by Cheapflights users on 1/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/235:30 pm
LAX
-
BHD
1 stop17h 45m
American Airlines
Tue 2/36:35 am
BHD
-
LAX
1 stop16h 45m
American Airlines
Deal found 1/12$638
This oojo deal was found by Cheapflights users on 1/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/184:18 pm
SJC
-
BHD
2 stops19h 02m
British Airways
Wed 4/2911:35 am
BHD
-
SJC
2 stops19h 24m
British Airways
Deal found 1/10$640
This British Airways deal was found by Cheapflights users on 1/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/256:00 am
ONT
-
BHD
2 stops26h 35m
British Airways
Sun 3/110:40 am
BHD
-
ONT
2 stops19h 27m
British Airways
Deal found 1/11$641
This British Airways deal was found by Cheapflights users on 1/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/42:07 pm
SJC
-
BHD
2 stops21h 03m
British Airways
Sun 3/83:10 pm
BHD
-
SJC
2 stops61h 11m
British Airways
Deal found 1/11$647

Cheapflights Fare Finder

 
Customize your flight search to find flights from California to Northern Ireland 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, Cheapflights users made 2,558,603 searches. Data last updated January 12, 2026.
Use the filters below to find and compare flights from California to Northern Ireland that are best for you.

Fly from

California

Fly to

Northern Ireland

Route

Depart

Return

Price

San FranciscoBelfast

SFO - BHD

SFOBHD

San Francisco

Wed 2/25

5:30 pm-4:35 pm

1 stop15h 05m

Belfast City

Wed 3/4

6:35 am-3:00 pm

1 stop16h 25m

$574

San FranciscoBelfast

SFO - BHD

SFOBHD

San Francisco

Sun 2/8

5:30 pm-4:50 pm

1 stop15h 20m

Belfast City

Tue 2/24

11:25 am-3:00 pm

1 stop35h 35m

$575

San FranciscoBelfast

SFO - BHD

SFOBHD

San Francisco

Tue 2/10

8:40 pm-8:15 am

1 stop27h 35m

Belfast City

Tue 2/17

8:45 am-3:00 pm

1 stop14h 15m

$583

San FranciscoBelfast

SFO - BHD

SFOBHD

San Francisco

Tue 2/10

7:30 am-10:30 am

2 stops19h 00m

Belfast City

Tue 2/17

8:45 am-8:14 pm

2 stops19h 29m

$589

Los AngelesBelfast

LAX - BHD

LAXBHD

Los Angeles

Wed 3/4

3:30 pm-2:15 pm

1 stop14h 45m

Belfast City

Sun 3/8

6:30 am-6:30 pm

1 stop20h 00m

$602

Los AngelesBelfast

LAX - BHD

LAXBHD

Los Angeles

Wed 2/25

3:30 pm-4:35 pm

1 stop17h 05m

Belfast City

Sun 3/1

6:30 am-6:30 pm

1 stop20h 00m

$602

San FranciscoBelfast

SFO - BHD

SFOBHD

San Francisco

Sun 2/8

3:50 pm-4:50 pm

2 stops17h 00m

Belfast City

Sun 2/15

12:10 pm-11:47 pm

2 stops19h 37m

$624

San FranciscoBelfast

SFO - BHD

SFOBHD

San Francisco

Wed 3/4

5:30 pm-7:10 pm

1 stop17h 40m

Belfast City

Sun 3/8

6:30 am-3:00 pm

1 stop16h 30m

$627

San JoseBelfast

SJC - BHD

SJCBHD

San Jose

Sat 4/18

4:18 pm-7:20 pm

2 stops19h 02m

Belfast City

Wed 4/29

11:35 am-10:59 pm

2 stops19h 24m

$640

OntarioBelfast

ONT - BHD

ONTBHD

Ontario

Wed 3/4

2:39 pm-4:35 pm

2 stops17h 56m

Belfast City

Sun 3/8

10:40 am-11:59 pm

2 stops20h 19m

$641

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/10

Showing 1-10 of 55 results
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Best time to book a flight from California to Northern Ireland

Have a flexible travel schedule? Discover the best time to fly to Northern Ireland from California 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.

Cheapflights Insights

Everything you need to know about your flight from California to Northern Ireland

What is the cheapest month to book a flight from California to Northern Ireland?

Currently, March is the cheapest month in which you can book a flight from California to Northern Ireland (average of $585). Flying from California to Northern Ireland in June is currently the most expensive (average of $927). 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.

How much does it cost to fly round-trip from California to Northern Ireland?

Reviews of airlines servicing Northern Ireland

Get insights into the airlines that provide service to Northern Ireland. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Northern Ireland. Reviews last updated January 12, 2026.
Peruse reviews from past customers who have flown with British Airways from California to Northern Ireland to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
British Airways
6.7
Okay
7,664 reviews

Boarding

6.9

Food

6.4

Comfort

6.8

Entertainment

6.4

Overall

6.7

Crew

7.6

Reviews

1 / 20
8.0
Excellent

Lakshmi,Dec 2025

SFO - LHR

I had a great time on the flight with good entertainment and food. The staff was awesome. The only thing was there was a delay in boarding and takeoff from London. However, I was pleasantly surprised when the airline sent an apology for the few later landing in Mumbai. They did not have WiFi on board on the leg from London to Mumbai but that was okay for me. On the first leg from SF to London, a couple of seats ahead of me had issues with their display so they could not watch anything on their screens although the stewardess gas be them an option to use the WiFi on their devices. This did not affect me, however, so that was cool. I would recommend British Airways. This was my first time flying with them and I had a lovely flight.
British Airways
6.7
Okay
7,664 reviews
British Airways
6.7
Okay
7,664 reviews

Boarding

6.9

Food

6.4

Comfort

6.8

Entertainment

6.4

Overall

6.7

Crew

7.6

Reviews

1 / 20
8.0
Excellent

Lakshmi,Dec 2025

SFO - LHR

I had a great time on the flight with good entertainment and food. The staff was awesome. The only thing was there was a delay in boarding and takeoff from London. However, I was pleasantly surprised when the airline sent an apology for the few later landing in Mumbai. They did not have WiFi on board on the leg from London to Mumbai but that was okay for me. On the first leg from SF to London, a couple of seats ahead of me had issues with their display so they could not watch anything on their screens although the stewardess gas be them an option to use the WiFi on their devices. This did not affect me, however, so that was cool. I would recommend British Airways. This was my first time flying with them and I had a lovely flight.

Related info for your journey

Find useful and relevant information for your journey from California to Northern Ireland. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from California to Northern Ireland?

    A quick flight from California to Northern Ireland can take about 15h 05m. British Airways provides one of the quickest options available for as low as $574. The distance between California and Northern Ireland is about 5038 mi.

  • Can I find deals for flights from California to Northern Ireland that include hotel bookings?

    Yes. In addition to deals on California to Northern Ireland flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from California to Northern Ireland?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from California to Northern Ireland.

  • Can I find deals for business class flights from California to Northern Ireland?

    Yes. Cheapflights offers flight deals from California to Northern Ireland 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 California to Northern Ireland?

    Currently, March is the cheapest month in which you can book a flight from California to Northern Ireland (average of $585). Flying from California to Northern Ireland in June is currently the most expensive (average of $927). 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

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Alternative routes for California to Northern Ireland

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from California to Northern Ireland

Discover the top airline that operate flights from California to Northern Ireland. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$599Average$890FlexibilityNo cancel feeOn-time70%

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