HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Northern Ireland

$363+ 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 3/19. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — BFS
Dec 13 — Dec 201
Sat 12/13
Sat 12/20
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from California to Northern Ireland with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 November 13, 2025.

Round-trip from

$611
(Cheapflightsfares)

One-way from

$363
(Trip.com)

Popular in

June

Cheapest in

October

Average price

$895
From California to Northern Ireland
Search Deals
One-way flight from California to Northern Ireland
Search Deals
Highest demand for flights based on searches. 18% potential increase in price ($199 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($40 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 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 November 13, 2025.

This Delta deal was found by Cheapflights users on 11/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/31:55 pmSFO - BHD
1 stop18h 55mDelta
Sun 12/76:30 amBHD - SFO
1 stop13h 20mDelta
Deal found 11/9$681
This Delta deal was found by Cheapflights users on 11/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/135:55 amOAK - BHD
2 stops31h 05mDelta
Mon 11/175:20 pmBHD - OAK
2 stops30h 51mDelta
Deal found 11/10$696
This Virgin Atlantic deal was found by Cheapflights users on 11/10. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/310:40 amSFO - BHD
2 stops26h 20mVirgin Atlantic
Sun 12/76:30 amBHD - SFO
2 stops25h 50mVirgin Atlantic
Deal found 11/10$696
This British Airways deal was found by Cheapflights users on 11/11. 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.
Mon 11/249:00 pmLAX - BHD
1 stop30h 30mBritish Airways
Tue 12/25:15 pmBHD - LAX
1 stop28h 15mBritish Airways
Deal found 11/11$702
This American Airlines deal was found by Cheapflights users on 11/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/155:00 pmSFO - BHD
2 stops19h 30mAmerican Airlines
Sat 11/226:35 amBHD - SFO
2 stops19h 49mAmerican Airlines
Deal found 11/10$703
This Delta deal was found by Cheapflights users on 11/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1511:45 amSFO - BHD
2 stops25h 15mDelta
Sun 11/236:30 amBHD - SFO
1 stop13h 20mDelta
Deal found 11/10$715
This Delta deal was found by Cheapflights users on 11/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1511:45 amSFO - BHD
2 stops25h 15mDelta
Sat 11/226:30 amBHD - SFO
1 stop13h 20mDelta
Deal found 11/12$716
This British Airways deal was found by Cheapflights users on 11/11. 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.
Mon 11/249:00 pmLAX - BHD
1 stop30h 30mBritish Airways
Sat 12/66:35 amBHD - LAX
1 stop14h 55mBritish Airways
Deal found 11/11$752
This FlightHub deal was found by Cheapflights users on 11/11. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/221:19 amLAX - BHD
2 stops27h 56mBritish Airways
Sun 12/76:30 amBHD - LAX
1 stop16h 50mBritish Airways
Deal found 11/11$761
This British Airways deal was found by Cheapflights users on 11/12. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/283:30 pmLAX - BHD
1 stop14h 45mBritish Airways
Tue 12/27:25 pmBHD - LAX
1 stop26h 05mBritish Airways
Deal found 11/12$789
This FlightHub deal was found by Cheapflights users on 11/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/63:01 pmSNA - BHD
2 stops20h 39mBritish Airways
Fri 12/127:35 pmBHD - SNA
2 stops28h 27mBritish Airways
Deal found 11/10$810
This KLM deal was found by Cheapflights users on 11/11. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/61:55 pmSFO - BHD
1 stop23h 05mKLM
Fri 12/125:20 pmBHD - SFO
1 stop26h 30mKLM
Deal found 11/11$833

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 November 13, 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 - BHD

LAXBHD

Los Angeles

Fri 1/23

9:50 am-10:30 am

2 stops16h 40m

Belfast City

Tue 2/3

10:00 am-3:50 pm

1 stop13h 50m

$626

San FranciscoBelfast

SFO - BHD

SFOBHD

San Francisco

Tue 3/3

5:30 pm-2:50 pm

1 stop13h 20m

Belfast City

Tue 3/10

10:00 am-7:45 pm

1 stop16h 45m

$640

Los AngelesBelfast

LAX - BHD

LAXBHD

Los Angeles

Fri 1/23

6:30 am-10:30 am

2 stops20h 00m

Belfast City

Tue 2/3

6:35 am-7:53 pm

2 stops21h 18m

$643

San FranciscoBelfast

SFO - BHD

SFOBHD

San Francisco

Tue 3/3

9:00 am-10:30 am

2 stops17h 30m

Belfast City

Tue 3/10

8:45 am-8:58 pm

2 stops19h 13m

$653

Los AngelesBelfast

LAX - BHD

LAXBHD

Los Angeles

Fri 3/27

3:38 pm-5:15 pm

2 stops18h 37m

Belfast City

Thu 4/2

6:35 am-5:47 pm

2 stops19h 12m

$669

San FranciscoBelfast

SFO - BHD

SFOBHD

San Francisco

Wed 12/3

1:55 pm-4:50 pm

1 stop18h 55m

Belfast City

Sun 12/7

6:30 am-11:50 am

1 stop13h 20m

$681

San FranciscoBelfast

SFO - BHD

SFOBHD

San Francisco

Wed 12/3

1:55 pm-9:00 pm

1 stop23h 05m

Belfast City

Sun 12/7

6:30 am-11:50 am

1 stop13h 20m

$681

San FranciscoBelfast

SFO - BFS

SFOBFS

San Francisco

Tue 3/3

5:20 pm-4:00 pm

2 stops14h 40m

Belfast Intl

Tue 3/10

8:35 am-3:30 pm

3 stops37h 55m

$727

Los AngelesBelfast

LAX - BHD

LAXBHD

Los Angeles

Mon 11/24

9:00 pm-11:30 am

1 stop30h 30m

Belfast City

Sat 12/6

6:35 am-1:30 pm

1 stop14h 55m

$752

Los AngelesBelfast

LAX - BHD

LAXBHD

Los Angeles

Fri 11/28

3:30 pm-2:15 pm

1 stop14h 45m

Belfast City

Tue 12/2

7:25 pm-1:30 pm

1 stop26h 05m

$789

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/12

Showing 1-10 of 34 results
1
2
3
4

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 $586). Flying from California to Northern Ireland in June is currently the most expensive (average of $914). 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 November 13, 2025.

Unlike in the evening, when flights are generally more expensive, you can save up to 17% on flights from California to Northern Ireland by exploring options for tickets in the morning.

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 November 13, 2025.
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
7,515 reviews

Food

6.3

Comfort

6.7

Entertainment

6.4

Overall

6.7

Crew

7.6

Boarding

6.9

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

IAD - LHR

The plane had to load and unload passengers not through a jet way but out on the tarmac at Heathrow. The steps were steep. We weren't expecting to have to carry our luggage up and down stairs.
British Airways
6.7
Okay
7,515 reviews
British Airways
6.7
Okay
7,515 reviews

Food

6.3

Comfort

6.7

Entertainment

6.4

Overall

6.7

Crew

7.6

Boarding

6.9

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

IAD - LHR

The plane had to load and unload passengers not through a jet way but out on the tarmac at Heathrow. The steps were steep. We weren't expecting to have to carry our luggage up and down stairs.

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 13h 20m. British Airways provides one of the quickest options available for as low as $640. The distance between California and Northern Ireland is about 5038 mi. This flight may include one or multiple stops.

  • 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 $586). Flying from California to Northern Ireland in June is currently the most expensive (average of $914). 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.
John F Kennedy Intl to Heathrow flights
Newark to Heathrow flights
LaGuardia to Heathrow flights
John F Kennedy Intl to London City flights
John F Kennedy Intl to Gatwick flights
Boston to Heathrow flights
Newark to Gatwick flights
Los Angeles to Heathrow flights
Dulles Intl to Heathrow flights
LaGuardia to Gatwick flights
John F Kennedy Intl to Stansted flights
O'Hare Intl to Heathrow flights
Newark to London City flights
John F Kennedy Intl to Luton flights
San Francisco to Heathrow flights
Dallas/Fort Worth to Heathrow flights
Baltimore to Heathrow flights
Seattle to Heathrow flights
Newark to Luton flights
Newark to Stansted flights
Miami to Heathrow flights
Boston to London City flights
Boston to Gatwick flights
Reagan-National to Heathrow flights
Dulles Intl to Gatwick flights
Atlanta to Heathrow flights
Los Angeles to Gatwick flights
Orlando to Heathrow flights
Dulles Intl to London City flights
Hobby to Heathrow flights
Los Angeles to London City flights
Philadelphia to Heathrow flights
Denver to Heathrow flights
Baltimore to Gatwick flights
O'Hare Intl to Gatwick flights
Reagan-National to Gatwick flights
Dulles Intl to Stansted flights
Boston to Stansted flights
O'Hare Intl to London City flights
San Francisco to Gatwick flights
Tampa to Heathrow flights
Minneapolis to Heathrow flights
Dallas/Fort Worth to Gatwick flights
LaGuardia to London City flights
Boston to Luton flights
San Francisco to London City flights
George Bush Intcntl to Heathrow flights
Newark to Edinburgh flights
Raleigh to Heathrow flights
Los Angeles to Stansted flights

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 November 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$599Average$894FlexibilityNo cancel feeOn-time70%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.