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Cheap flights from California to Northern Ireland from £403

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 23/5. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — BFS
5 Apr — 12 Apr1
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 31 March 2025.

Round-trip from

£507

One-way from

£403

Popular in

June

Cheapest in

November

Average price

£644
30/4-7/5
  • 30/4-7/5
  • 2 total stops
  • 47h 20m total
  • California to Northern Ireland
Search Deals
23/5
  • 23/5
  • 3 total stops
  • 56h 45m total
  • California to Northern Ireland
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£65 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£14 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 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 31 March 2025.

Wed 30/416:30LAX - BFS
1 stop31h 20mMultiple Airlines
Wed 7/506:10BFS - LAX
1 stop16h 00mMultiple Airlines
Deal found 31/3£507
Wed 15/1015:40LAX - BHD
1 stop13h 50mBritish Airways
Thu 23/1012:40BHD - LAX
1 stop15h 35mBritish Airways
Deal found 30/3£512
Tue 8/419:30SFO - BHD
1 stop14h 00mBritish Airways
Tue 15/420:20BHD - SFO
1 stop25h 30mBritish Airways
Deal found 30/3£515
Tue 8/415:54SFO - BHD
2 stops17h 36mAmerican Airlines
Tue 15/406:35BHD - SFO
2 stops20h 18mAmerican Airlines
Deal found 30/3£522
Wed 30/410:54ONT - BHD
2 stops17h 01mBritish Airways
Wed 7/511:30BHD - ONT
2 stops18h 27mBritish Airways
Deal found 31/3£522
Wed 15/1013:26LAX - BHD
2 stops16h 04mAmerican Airlines
Thu 23/1006:35BHD - LAX
1 stop19h 00mAmerican Airlines
Deal found 30/3£536
Thu 1/514:19SJC - BHD
2 stops20h 26mBritish Airways
Mon 12/519:30BHD - SJC
2 stops34h 14mBritish Airways
Deal found 30/3£545
Wed 3/919:20SFO - BHD
1 stop15h 20mIberia
Fri 12/906:35BHD - SFO
1 stop18h 50mIberia
Deal found 29/3£546
Mon 7/716:30LAX - BHD
1 stop17h 00mMultiple Airlines
Fri 18/718:50BHD - LAX
2 stops35h 20mMultiple Airlines
Deal found 30/3£657
Thu 1/516:20SFO - BFS
1 stop17h 55mMultiple Airlines
Mon 12/521:55BFS - SFO
2 stops47h 20mMultiple Airlines
Deal found 30/3£678
Thu 1/508:35SFO - BHD
2 stops22h 35mMultiple Airlines
Mon 12/506:55BHD - SFO
3 stops43h 45mMultiple Airlines
Deal found 30/3£825
Thu 15/506:00SJC - BFS
3 stops24h 05mMultiple Airlines
Thu 22/506:10BFS - SJC
3 stops25h 19mMultiple Airlines
Deal found 31/3£899

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 31 March 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

Wed 30/4

16:30-07:50

1 stop31h 20m

Belfast Intl

Wed 7/5

06:10-14:10

1 stop16h 00m

£507

Los AngelesBelfast

LAX - BHD

LAXBHD

Los Angeles

Wed 30/4

13:20-11:55

1 stop14h 35m

Belfast City

Wed 7/5

06:50-13:25

1 stop14h 35m

£516

OntarioBelfast

ONT - BHD

ONTBHD

Ontario

Wed 30/4

10:54-11:55

2 stops17h 01m

Belfast City

Wed 7/5

11:30-21:57

2 stops18h 27m

£522

San JoseBelfast

SJC - BHD

SJCBHD

San Jose

Thu 1/5

14:19-18:45

2 stops20h 26m

Belfast City

Mon 12/5

19:30-21:44

2 stops34h 14m

£545

San FranciscoBelfast

SFO - BHD

SFOBHD

San Francisco

Sat 3/5

22:33-09:05

2 stops26h 32m

Belfast City

Sat 10/5

19:00-19:16

2 stops32h 16m

£545

San FranciscoBelfast

SFO - BHD

SFOBHD

San Francisco

Wed 3/9

19:20-18:40

1 stop15h 20m

Belfast City

Fri 12/9

06:35-17:25

1 stop18h 50m

£546

San FranciscoBelfast

SFO - BHD

SFOBHD

San Francisco

Wed 3/9

11:35-13:30

2 stops17h 55m

Belfast City

Fri 12/9

06:35-17:25

1 stop18h 50m

£550

Los AngelesBelfast

LAX - BHD

LAXBHD

Los Angeles

Mon 7/7

16:30-17:30

1 stop17h 00m

Belfast City

Fri 18/7

18:50-22:10

2 stops35h 20m

£657

San FranciscoBelfast

SFO - BFS

SFOBFS

San Francisco

Thu 1/5

16:20-18:15

1 stop17h 55m

Belfast Intl

Mon 12/5

21:55-13:15

2 stops47h 20m

£678

Los AngelesBelfast

LAX - BHD

LAXBHD

Los Angeles

Wed 4/6

17:05-15:35

1 stop14h 30m

Belfast City

Sat 14/6

07:05-17:05

2 stops18h 00m

£795

Flights are sorted by cheapest return flights first.

Deals found on 30/3

Showing 1-10 of 19 results
1
2

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 31 March 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.

Rainfall in Northern Ireland by month

Plan your trip to Northern Ireland by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Northern Ireland ranges from 50.0 - 90.0 inches per month. October is typically the wettest month, when rainfall can reach 90.0 mm. April is typically the driest time to visit Northern Ireland when rainfall is around 50.0 mm.

Temperature in Northern Ireland by month

Plan your trip to Northern Ireland by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Northern Ireland, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 16.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 5.0 C).

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 31 March 2025.
To help decide which airline to fly from California to Northern Ireland, see what other customers have to say about American Airlines, Iberia and British Airways. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.2
Good
10,000 reviews
Check prices

Comfort

7.2

Entertainment

6.9

Food

6.5

Crew

8.0

Overall

7.2

Boarding

7.5

Reviews

1 / 20
2.0
Mediocre

Anonymous,Oct 2024

LAX - ORD

The seats are just SO UNCOMFORTABLE it completely ruins the experience, especially on a redeye. I was so exhausted but couldn’t sleep a wink because it was just so incredibly uncomfortable. I don’t know who designs airplane seats, but they’re curved forward, forcing your body into a slouching position. Please. Please please get new seats. Also ones that actually extent to the bulkhead so that when you try to lean against the wall, you don’t just fall through the gap
American Airlines
7.2
Good
10,000 reviews
American Airlines
7.2
Good
10,000 reviews
Check prices

Comfort

7.2

Entertainment

6.9

Food

6.5

Crew

8.0

Overall

7.2

Boarding

7.5

Reviews

1 / 20
2.0
Mediocre

Anonymous,Oct 2024

LAX - ORD

The seats are just SO UNCOMFORTABLE it completely ruins the experience, especially on a redeye. I was so exhausted but couldn’t sleep a wink because it was just so incredibly uncomfortable. I don’t know who designs airplane seats, but they’re curved forward, forcing your body into a slouching position. Please. Please please get new seats. Also ones that actually extent to the bulkhead so that when you try to lean against the wall, you don’t just fall through the gap
Iberia
7.0
Good
2,653 reviews
American Airlines
7.2
Good
10,000 reviews
Check prices

Comfort

7.2

Entertainment

6.9

Food

6.5

Crew

8.0

Overall

7.2

Boarding

7.5

Reviews

1 / 20
2.0
Mediocre

Anonymous,Oct 2024

LAX - ORD

The seats are just SO UNCOMFORTABLE it completely ruins the experience, especially on a redeye. I was so exhausted but couldn’t sleep a wink because it was just so incredibly uncomfortable. I don’t know who designs airplane seats, but they’re curved forward, forcing your body into a slouching position. Please. Please please get new seats. Also ones that actually extent to the bulkhead so that when you try to lean against the wall, you don’t just fall through the gap
British Airways
6.6
Okay
6,713 reviews
American Airlines
7.2
Good
10,000 reviews
Check prices

Comfort

7.2

Entertainment

6.9

Food

6.5

Crew

8.0

Overall

7.2

Boarding

7.5

Reviews

1 / 20
2.0
Mediocre

Anonymous,Oct 2024

LAX - ORD

The seats are just SO UNCOMFORTABLE it completely ruins the experience, especially on a redeye. I was so exhausted but couldn’t sleep a wink because it was just so incredibly uncomfortable. I don’t know who designs airplane seats, but they’re curved forward, forcing your body into a slouching position. Please. Please please get new seats. Also ones that actually extent to the bulkhead so that when you try to lean against the wall, you don’t just fall through the gap

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.

  • 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

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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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