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Cheap flights from California to Northern Ireland from £327

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 7/8. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — BFS
4 Aug — 11 Aug1
1 adult

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 30 July 2025.

Round-trip from

£393

One-way from

£327

Popular in

June

Cheapest in

September

Average price

£729
21/9-30/9
  • 21/9-30/9
  • 2 total stops
  • 45h 05m total
  • California to Northern Ireland
Search Deals
7/8
  • 7/8
  • 3 total stops
  • 30h 25m total
  • California to Northern Ireland
Search Deals
Highest demand for flights based on searches. 20% potential increase in price (£129 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£27 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2025
Search Deals

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 30 July 2025.

Wed 10/916:30LAX - BFS
1 stop31h 20mMultiple Airlines
Wed 17/906:10BFS - LAX
1 stop16h 00mMultiple Airlines
Deal found 27/7£378
Sun 21/916:30LAX - BHD
1 stop19h 55mMultiple Airlines
Tue 30/914:20BHD - LAX
1 stop31h 50mMultiple Airlines
Deal found 29/7£399
Sun 23/1117:30SFO - BHD
1 stop17h 10mBritish Airways
Tue 2/1219:25BHD - SFO
1 stop27h 35mBritish Airways
Deal found 29/7£472
Mon 13/1020:05LAX - BHD
1 stop13h 25mBritish Airways
Fri 24/1014:00BHD - LAX
1 stop14h 15mBritish Airways
Deal found 28/7£476
Tue 9/913:25LAX - BHD
1 stop15h 35mAmerican Airlines
Fri 19/906:35BHD - LAX
2 stops18h 54mAmerican Airlines
Deal found 28/7£501
Wed 3/1213:55SFO - BHD
1 stop18h 55mDelta
Sun 7/1206:30BHD - SFO
1 stop13h 20mDelta
Deal found 29/7£552
Wed 3/1211:05SFO - BHD
2 stops25h 55mVirgin Atlantic
Sun 7/1217:20BHD - SFO
2 stops34h 05mVirgin Atlantic
Deal found 29/7£563
Tue 9/915:13LAX - BHD
2 stops22h 02mDelta
Fri 19/906:30BHD - LAX
2 stops20h 58mDelta
Deal found 28/7£563
Fri 31/1010:57ONT - BHD
2 stops16h 33mBritish Airways
Fri 7/1106:45BHD - ONT
2 stops20h 56mBritish Airways
Deal found 27/7£565
Thu 28/806:00SJC - BHD
2 stops19h 20mBritish Airways
Thu 11/906:35BHD - SJC
2 stops22h 30mBritish Airways
Deal found 28/7£578
Wed 8/1013:30SJC - BHD
2 stops19h 25mKLM
Sun 12/1017:25BHD - SJC
2 stops32h 54mKLM
Deal found 29/7£602
Fri 12/906:00SJC - BFS
3 stops30h 05mMultiple Airlines
Fri 19/906:05BFS - SJC
3 stops33h 15mMultiple Airlines
Deal found 29/7£647

Cheapflights Fare Finder

 
Customise 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 858,174 searches. Data last updated 30 July 2025.
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

Los AngelesBelfast

LAX - BFS

LAXBFS

Los Angeles

Sun 21/9

16:30-20:20

1 stop19h 50m

Belfast Intl

Tue 30/9

20:55-14:10

1 stop25h 15m

£393

Los AngelesBelfast

LAX - BHD

LAXBHD

Los Angeles

Sun 21/9

16:30-20:25

1 stop19h 55m

Belfast City

Tue 30/9

14:20-14:10

1 stop31h 50m

£399

San FranciscoBelfast

SFO - BHD

SFOBHD

San Francisco

Sun 23/11

17:30-18:40

1 stop17h 10m

Belfast City

Tue 2/12

19:25-15:00

1 stop27h 35m

£472

Los AngelesBelfast

LAX - BHD

LAXBHD

Los Angeles

Mon 13/10

20:05-17:30

1 stop13h 25m

Belfast City

Fri 24/10

14:00-20:15

1 stop14h 15m

£476

Los AngelesBelfast

LAX - BHD

LAXBHD

Los Angeles

Tue 9/9

13:25-13:00

1 stop15h 35m

Belfast City

Fri 19/9

06:35-17:29

2 stops18h 54m

£501

San FranciscoBelfast

SFO - BHD

SFOBHD

San Francisco

Wed 3/12

13:55-16:50

1 stop18h 55m

Belfast City

Sun 7/12

06:30-11:50

1 stop13h 20m

£552

San FranciscoBelfast

SFO - BHD

SFOBHD

San Francisco

Wed 3/12

11:05-21:00

2 stops25h 55m

Belfast City

Sun 7/12

17:20-19:25

2 stops34h 05m

£563

Los AngelesBelfast

LAX - BHD

LAXBHD

Los Angeles

Tue 9/9

15:13-21:15

2 stops22h 02m

Belfast City

Fri 19/9

06:30-19:28

2 stops20h 58m

£563

OntarioBelfast

ONT - BHD

ONTBHD

Ontario

Fri 31/10

10:57-10:30

2 stops16h 33m

Belfast City

Fri 7/11

06:45-19:41

2 stops20h 56m

£565

San JoseBelfast

SJC - BHD

SJCBHD

San Jose

Thu 28/8

06:00-09:20

2 stops19h 20m

Belfast City

Thu 11/9

06:35-21:05

2 stops22h 30m

£578

Flights are sorted by cheapest return flights first.

Deals found on 29/7

Showing 1-10 of 26 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 return 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, January is the cheapest month in which you can book a flight from California to Northern Ireland (average of £67). Flying from California to Northern Ireland in July is currently the most expensive (average of £90). 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.

What is the cheapest time of day to fly from CA to NIR?

Find hourly flight availability from California to Northern Ireland. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 30 July 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from California to Northern Ireland as you normally would.

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 30 July 2025.
Get a feel of what it's like to fly with Delta, KLM, andVirgin Atlantic from California to Northern Ireland by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,980 reviews
Check prices

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very Good
7,980 reviews
Delta
8.0
Very Good
7,980 reviews
Check prices

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,383 reviews
Delta
8.0
Very Good
7,980 reviews
Check prices

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Virgin Atlantic
7.4
Good
655 reviews
Delta
8.0
Very Good
7,980 reviews
Check prices

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very Good
7,980 reviews
Check prices

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Aer Lingus
7.1
Good
1,190 reviews
Delta
8.0
Very Good
7,980 reviews
Check prices

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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.

  • What are the cheapest airlines to fly from California to Northern Ireland one-way?

    The cheapet airlines for a one-way flight from California to Northern Ireland are KLM (£347), British Airways (£520), and American Airlines (£1,101).

  • 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 holiday 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, January is the cheapest month in which you can book a flight from California to Northern Ireland (average of £67). Flying from California to Northern Ireland in July is currently the most expensive (average of £90). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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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