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Cheap flights from Northern Ireland to California from £306

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 8/1. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — LAX
20 Nov — 27 Nov1
1 adult
1 adult, Economy

Find flight deals from Northern Ireland to California

Enter your travel dates to find the best prices.

Cheapest flights from Northern Ireland to California
Explore the most affordable flight options available from Northern Ireland to California. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 October 2025.

Wed 3/1217:30BFS - LAX
2 stops29h 45mMultiple Airlines
Wed 10/1212:30LAX - BFS
2 stops17h 35mMultiple Airlines
Deal found 19/10£513
Wed 19/1106:00BFS - SFO
1 stop19h 00mMultiple Airlines
Wed 26/1112:50SFO - BFS
1 stop19h 05mMultiple Airlines
Deal found 20/10£565
Wed 19/1106:30BHD - SFO
1 stop13h 20mDelta
Wed 26/1110:39SFO - BHD
2 stops26h 21mDelta
Deal found 20/10£569
Thu 4/1206:30BHD - SFO
1 stop13h 20mKLM
Thu 11/1213:55SFO - BHD
1 stop18h 55mKLM
Deal found 20/10£599
Thu 4/1206:30BHD - SFO
2 stops20h 26mDelta
Thu 11/1210:30SFO - BHD
2 stops22h 20mDelta
Deal found 20/10£604
Tue 23/1219:25BHD - SFO
2 stops32h 19mBritish Airways
Thu 8/120:40SFO - BHD
1 stop15h 50mBritish Airways
Deal found 19/10£652
Tue 23/1217:15BHD - SFO
1 stop29h 45mMultiple Airlines
Thu 8/117:30SFO - BHD
1 stop15h 10mMultiple Airlines
Deal found 19/10£665
Tue 23/1214:15BFS - SFO
2 stops34h 15mMultiple Airlines
Thu 8/119:25SFO - BFS
2 stops18h 55mMultiple Airlines
Deal found 19/10£666
Wed 29/1007:40BFS - LAS
3 stops44h 25mMultiple Airlines
Thu 25/1209:10LAS - BFS
3 stops29h 10mMultiple Airlines
Deal found 20/10£684
Wed 3/1217:00BFS - SFO
2 stops26h 50mMultiple Airlines
Wed 10/1213:55SFO - BFS
2 stops18h 20mMultiple Airlines
Deal found 19/10£712
Wed 19/1106:30BHD - LAS
2 stops18h 50mDelta
Wed 26/1110:22LAS - BHD
2 stops22h 28mDelta
Deal found 20/10£729
Wed 19/1117:20BHD - LAS
1 stop28h 55mMultiple Airlines
Wed 26/1112:30LAS - BHD
2 stops20h 20mMultiple Airlines
Deal found 20/10£758

Cheap flight deals from Northern Ireland to California

Keep the following information in mind while searching for Northern Ireland to California flight deals. Data was last updated 21 October 2025.

Round-trip from

£513

One-way from

£306

Popular in

February

Cheapest in

January

Average price

£481
3/12-10/12
  • 3/12-10/12
  • 4 total stops
  • 47h 20m total
  • Northern Ireland to California
Search Deals
8/1
  • 8/1
  • 3 total stops
  • 48h 31m total
  • Northern Ireland to California
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (£18 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£18 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Northern Ireland to California 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 21 October 2025.
Use the filters below to find and compare flights from Northern Ireland to California that are best for you.

Fly from

Northern Ireland

Fly to

California

Route

Depart

Return

Price

BelfastLos Angeles

BFS - LAX

BFSLAX

Belfast Intl

Wed 3/12

17:30-15:15

2 stops29h 45m

Los Angeles

Wed 10/12

12:30-14:05

2 stops17h 35m

£513

BelfastSan Francisco

BHD - SFO

BHDSFO

Belfast City

Wed 19/11

06:30-11:50

1 stop13h 20m

San Francisco

Wed 26/11

13:55-21:00

1 stop23h 05m

£569

BelfastSan Francisco

BHD - SFO

BHDSFO

Belfast City

Wed 19/11

06:30-11:50

1 stop13h 20m

San Francisco

Wed 26/11

10:39-21:00

2 stops26h 21m

£569

BelfastSanta Ana

BHD - SNA

BHDSNA

Belfast City

Mon 9/3

06:35-19:21

2 stops19h 46m

Santa Ana J. Wayne/Orange Cnty

Wed 11/3

13:43-14:00

2 stops41h 17m

£576

BelfastSan Francisco

BHD - SFO

BHDSFO

Belfast City

Thu 4/12

06:30-11:50

1 stop13h 20m

San Francisco

Thu 11/12

07:00-16:50

2 stops25h 50m

£599

BelfastSan Francisco

BHD - SFO

BHDSFO

Belfast City

Thu 5/3

11:05-18:45

1 stop15h 40m

San Francisco

Mon 9/3

10:24-14:15

2 stops20h 51m

£601

BelfastOntario

BHD - ONT

BHDONT

Belfast City

Fri 27/2

06:45-20:24

2 stops21h 39m

Ontario

Tue 3/3

06:47-10:30

2 stops19h 43m

£606

BelfastOntario

BHD - ONT

BHDONT

Belfast City

Thu 5/3

11:05-21:40

2 stops18h 35m

Ontario

Mon 9/3

06:00-14:15

2 stops25h 15m

£606

BelfastOntario

BHD - ONT

BHDONT

Belfast City

Thu 26/2

10:40-23:43

2 stops21h 03m

Ontario

Mon 2/3

11:05-14:15

2 stops19h 10m

£607

BelfastSan Francisco

BFS - SFO

BFSSFO

Belfast Intl

Tue 23/12

14:15-16:30

2 stops34h 15m

San Francisco

Thu 8/1

19:25-22:20

2 stops18h 55m

£666

Flights are sorted by cheapest return flights first.

Deals found on 19/10

Showing 1-10 of 32 results
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Best time to book a flight from Northern Ireland to California

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

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

Currently, November is the cheapest month in which you can book a flight from Northern Ireland to California (average of £355). Flying from Northern Ireland to California in December is currently the most expensive (average of £505). 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 NIR to CA?

Find hourly flight availability from Northern Ireland to California. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 21 October 2025.

When flying from Northern Ireland to California, the time of day you fly usually plays a role in the price. Save by searching for a flight at midday, which can drop the price by up to 7% versus a flight in the afternoon.

Reviews of airlines servicing California

Get insights into the airlines that provide service to California. 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 California. Reviews last updated 21 October 2025.
Read through reviews of airlines operating flights from Northern Ireland to California, such as KLM, American Airlines, andBritish Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.7
Good
1,404 reviews
Check prices

Crew

8.4

Entertainment

7.1

Boarding

7.8

Comfort

7.6

Overall

7.7

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
KLM
7.7
Good
1,404 reviews
KLM
7.7
Good
1,404 reviews
Check prices

Crew

8.4

Entertainment

7.1

Boarding

7.8

Comfort

7.6

Overall

7.7

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
American Airlines
7.2
Good
11,024 reviews
KLM
7.7
Good
1,404 reviews
Check prices

Crew

8.4

Entertainment

7.1

Boarding

7.8

Comfort

7.6

Overall

7.7

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
British Airways
6.7
Okay
7,461 reviews
KLM
7.7
Good
1,404 reviews
Check prices

Crew

8.4

Entertainment

7.1

Boarding

7.8

Comfort

7.6

Overall

7.7

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

Related info for your journey

Find useful and relevant information for your journey from Northern Ireland to California. 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 Northern Ireland to California?

    There are many flights that can get you from Northern Ireland to California in 13h 20m. Fly via KLM, Delta, or American Airlines to get the fastest option. Northern Ireland and California are separated by a distance of 5038 mi. This flight may include one or multiple stops.

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

    £490 is the cheapest one-way deal found within the past few days, from British Airways. You may also be able to find cheap deals on Finnair and American Airlines, with prices starting from £498 and £504, respectively.

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

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

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

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

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

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

    Currently, November is the cheapest month in which you can book a flight from Northern Ireland to California (average of £355). Flying from Northern Ireland to California in December is currently the most expensive (average of £505). 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 Northern Ireland to California

See prices for flight routes from nearby airports that may be better suited for you.
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Top 3 airlines flying from Northern Ireland to California

Discover the top 3 airlines that operate flights from Northern Ireland to California. 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 858,174 searches. Data last updated 21 October 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£368Average£585FlexibilityNo cancel feeOn-time70%
Search British Airways flights
American AirlinesCheapest£472Average£523FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
KLMCheapest£505Average£612FlexibilityNo cancel feeOn-time75%
Search KLM flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Northern Ireland to California?

Cheapflights makes it easy to find Northern Ireland to California 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 Northern Ireland to California?

Cheapflights simply makes it quick and affordable to book flights from Northern Ireland to California by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

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

Need flexible booking options for your flight to California from Northern Ireland? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Northern Ireland to California become cheaper?

Yes! Start tracking prices for Northern Ireland to California flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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