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Cheap flights from California to Northern Ireland from £485

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 24/3. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — BFS
30 Nov — 7 Dec1
1 adult
1 adult, Economy, 0 bags

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 October 2025.

Round-trip from

£465

Popular in

June

Cheapest in

October

Average price

£480
British Airways
  • British Airways
  • 23/1-3/2
  • 2 total stops
  • 34h 10m total
  • California to Northern Ireland
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (£121 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£24 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Find flight deals from California to Northern Ireland

Enter your travel dates to find the best prices.

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 October 2025.

Tue 4/1113:00SJC - BHD
2 stops19h 45mMultiple Airlines
Wed 12/1111:25BHD - SJC
2 stops30h 51mMultiple Airlines
Deal found 30/10£491
Tue 4/1113:55SFO - BHD
1 stop18h 55mKLM
Thu 13/1106:30BHD - SFO
1 stop13h 20mKLM
Deal found 30/10£497
Tue 4/1111:35SJC - BHD
2 stops21h 15mKLM
Thu 13/1106:30BHD - SJC
2 stops20h 36mKLM
Deal found 30/10£508
Sun 7/1208:00SFO - BHD
2 stops18h 20mMultiple Airlines
Sun 14/1209:10BHD - SFO
1 stop13h 50mMultiple Airlines
Deal found 28/10£508
Thu 30/1013:19SFO - BHD
2 stops17h 41mAmerican Airlines
Thu 6/1106:35BHD - SFO
2 stops19h 51mAmerican Airlines
Deal found 28/10£514
Wed 3/1213:55SFO - BHD
1 stop23h 05mVirgin Atlantic
Sun 7/1206:30BHD - SFO
1 stop13h 20mVirgin Atlantic
Deal found 27/10£520
Thu 13/1105:55OAK - BHD
2 stops31h 05mDelta
Mon 17/1117:20BHD - OAK
2 stops30h 51mDelta
Deal found 28/10£530
Wed 12/1111:40SJC - BHD
2 stops21h 10mVirgin Atlantic
Sun 16/1117:20BHD - SJC
2 stops35h 15mVirgin Atlantic
Deal found 30/10£530
Sat 15/1106:00SFO - BHD
2 stops26h 50mDelta
Sun 23/1106:30BHD - SFO
1 stop13h 20mDelta
Deal found 28/10£545
Thu 13/1105:55OAK - BHD
2 stops26h 55mKLM
Mon 17/1117:20BHD - OAK
2 stops30h 51mKLM
Deal found 30/10£570
Wed 12/1111:40SJC - BHD
2 stops25h 20mKLM
Sun 16/1117:20BHD - SJC
2 stops30h 45mKLM
Deal found 28/10£570
Sun 14/1220:15LAX - BFS
2 stops16h 00mMultiple Airlines
Sun 21/1207:10BFS - LAX
2 stops19h 20mMultiple Airlines
Deal found 30/10£644

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 October 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

San FranciscoBelfast

SFO - BHD

SFOBHD

San Francisco

Tue 24/3

18:30-18:40

1 stop17h 10m

Belfast City

Tue 31/3

06:35-13:50

1 stop15h 15m

£485

Los AngelesBelfast

LAX - BHD

LAXBHD

Los Angeles

Fri 23/1

13:45-16:50

1 stop19h 05m

Belfast City

Tue 3/2

17:20-11:45

1 stop26h 25m

£489

Los AngelesBelfast

LAX - BHD

LAXBHD

Los Angeles

Fri 23/1

09:30-16:50

2 stops23h 20m

Belfast City

Tue 3/2

17:20-11:45

1 stop26h 25m

£493

San FranciscoBelfast

SFO - BHD

SFOBHD

San Francisco

Tue 24/3

10:24-11:30

2 stops18h 06m

Belfast City

Tue 31/3

06:35-18:42

2 stops20h 07m

£499

San FranciscoBelfast

SFO - BHD

SFOBHD

San Francisco

Sun 7/12

08:00-10:20

2 stops18h 20m

Belfast City

Sun 14/12

09:10-15:00

1 stop13h 50m

£508

San FranciscoBelfast

SFO - BHD

SFOBHD

San Francisco

Wed 3/12

13:55-21:00

1 stop23h 05m

Belfast City

Sun 7/12

06:30-11:50

1 stop13h 20m

£520

San FranciscoBelfast

SFO - BHD

SFOBHD

San Francisco

Tue 25/11

15:30-16:45

2 stops17h 15m

Belfast City

Tue 2/12

06:35-18:24

2 stops19h 49m

£523

OaklandBelfast

OAK - BHD

OAKBHD

Oakland

Thu 13/11

05:55-21:00

2 stops31h 05m

Belfast City

Mon 17/11

17:20-16:11

2 stops30h 51m

£530

San JoseBelfast

SJC - BHD

SJCBHD

San Jose

Wed 12/11

11:40-16:50

2 stops21h 10m

Belfast City

Sun 16/11

17:20-20:35

2 stops35h 15m

£530

San JoseBelfast

SJC - BHD

SJCBHD

San Jose

Thu 2/4

12:55-16:55

2 stops20h 00m

Belfast City

Mon 6/4

17:25-21:49

2 stops36h 24m

£550

Flights are sorted by cheapest return flights first.

Deals found on 30/10

Showing 1-10 of 38 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, March is the cheapest month in which you can book a flight from California to Northern Ireland (average of £445). Flying from California to Northern Ireland in June is currently the most expensive (average of £688). 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 October 2025.

One of the essential ways to save on airfare from California to Northern Ireland is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight at midday could potentially save you up to 26% on airfare.

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?

    Departing from California to Northern Ireland will take you 17h 10m. California and Northern Ireland are separated by a distance of 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 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, March is the cheapest month in which you can book a flight from California to Northern Ireland (average of £445). Flying from California to Northern Ireland in June is currently the most expensive (average of £688). 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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How does Cheapflights help users find flights from California to Northern Ireland?

Cheapflights makes it easy to find California to Northern Ireland flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from California to Northern Ireland?

Millions of users choose and trust Cheapflights to book the best flight deals from California to Northern Ireland for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from California to Northern Ireland with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from California to Northern Ireland flexibly with Cheapflights today.

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Of course! You can now track prices for flights from California to Northern Ireland and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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