What are the cheapest airlines to fly from California to London Heathrow Airport one-way?

$294 is the cheapest one-way deal found within the past few days, from TAP AIR PORTUGAL. You may also be able to find cheap deals on WestJet and JetBlue, with prices starting from $313 and $324, respectively.

What are the most popular routes from California to London Heathrow Airport?

When deciding which route to take from California to London Heathrow Airport consider Los Angeles - London Heathrow, San Francisco - London Heathrow or San Diego - London Heathrow as they are the most popular.

What are the cheapest flights from California to London Heathrow Airport?

Looking at all options, your cheapest flight can be booked for $418. While the most popular route (Los Angeles - London Heathrow) can be booked for $504 on average our data indicates $3,229 when flying from California to London Heathrow Airport.

What are the most reliable airlines from California to London Heathrow Airport?

The top 3 most reliable airlines when flying from California to London Heathrow Airport are Air France (91%), Delta (91%) and Aeromexico (91%).

What are the most popular airlines that fly from California to London Heathrow Airport?

Consider American Airlines, Air Canada or Air France when booking your flight. These represent the most popular airlines when flying from California to London Heathrow Airport.

How far in advance should I book a flight from California to London Heathrow Airport?

To save on the cost of your flight from California to London Heathrow Airport, book at least 54 days before your planned departure. Booking around this time can save you about 9% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $715 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $959.

What is the cheapest month to fly from California to London Heathrow Airport?

The best pricing can be found in the month of October. Prices to London Heathrow Airport from California average $746. You can even find prices in October for less than $746, as users have found deals to London Heathrow Airport from as low as $440. The month of June appears to be one of the more expensive times to travel to London Heathrow Airport from California. Flying in the targeted month can save you up to 30%.

Can I find deals for flights from California to Heathrow that include hotel bookings?

Yes. In addition to deals on California to Heathrow flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from California to Heathrow?

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

Can I find deals for business class flights from California to Heathrow?

Yes. Cheapflights offers flight deals from California to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$265+ Flights from California to London Heathrow Airport

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Cheap flight deals from California to Heathrow

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$585 (CrystalTravel)
One-way from	$265 (Kiwi.com)
Popular in	June
Cheapest in	October
Average price	$676
Good round-trip deal	$686 or less
Good one-way deal	$466 or less

Provider with most accurate pricing for Los Angeles-London (LON) flight deals.

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Provider most trusted by Cheapflights users for Los Angeles-London (LON) flights.

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From California to London Heathrow

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One-way flight from California to London Heathrow

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Highest demand for flights based on searches. 14% potential increase in price ($124 potential increase over avg. RT price).

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Cheapest flight prices on average. 2% potential price decrease ($21 potential savings vs. average RT price).

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Average for round-trip flights in March 2025

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Price to beat on a round-trip flight from California to London Heathrow.

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Price to beat on a one-way flight from California to London Heathrow.

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Find flight deals from California to Heathrow

Cheapest flights from California to Heathrow
Explore the most affordable flight options available from California to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 28, 2025.

Wed 10/17:30 pmLAX - LHR

1 stop15h 00mScandinavian Airlines

Tue 10/77:05 amLHR - LAX

2 stops17h 15mScandinavian Airlines

Deal found 3/28

$585

Fri 5/911:20 pmLAS - LHR

2 stops26h 15mScandinavian Airlines

Mon 5/127:05 amLHR - LAS

2 stops25h 13mScandinavian Airlines

Deal found 3/27

$587

Mon 4/1410:45 pmLAX - LHR

1 stop23h 50mAir Canada

Fri 4/2510:15 amLHR - LAX

2 stops16h 53mAir Canada

Deal found 3/27

$599

Sun 5/48:15 pmLAX - LHR

1 stop14h 40mAer Lingus

Thu 5/2212:00 pmLHR - LAX

1 stop14h 25mAer Lingus

Deal found 3/26

$604

Tue 7/224:40 pmLAX - LHR

1 stop18h 10mTAP AIR PORTUGAL

Tue 8/196:00 amLHR - LAX

1 stop16h 40mTAP AIR PORTUGAL

Deal found 3/27

$606

Tue 4/157:40 pmSFO - LHR

1 stop18h 00mScandinavian Airlines

Tue 5/69:05 pmLHR - SFO

2 stops27h 25mScandinavian Airlines

Deal found 3/27

$606

Wed 4/161:20 pmLAX - LHR

Nonstop10h 40mIberia

Wed 4/3011:40 amLHR - LAX

Nonstop11h 15mIberia

Deal found 3/26

$607

Wed 4/24:35 pmSFO - LHR

1 stop12h 45mMultiple Airlines

Tue 4/158:45 amLHR - SFO

1 stop15h 25mMultiple Airlines

Deal found 3/27

$609

Mon 5/57:45 pmLAX - LHR

1 stop34h 30mMultiple Airlines

Wed 5/148:50 pmLHR - LAX

1 stop30h 15mMultiple Airlines

Deal found 3/27

$616

Wed 4/24:05 pmSFO - LHR

Nonstop10h 20mVirgin Atlantic

Tue 4/156:30 amLHR - SFO

1 stop13h 15mVirgin Atlantic

Deal found 3/27

$625

Sun 4/64:05 pmSFO - LHR

Nonstop10h 20mKLM

Tue 4/2211:15 amLHR - SFO

Nonstop11h 00mKLM

Deal found 3/27

$629

Thu 9/254:20 pmSFO - LHR

1 stop21h 45mTAP AIR PORTUGAL

Tue 10/146:45 pmLHR - SFO

1 stop27h 50mTAP AIR PORTUGAL

Deal found 3/27

$631

Best flights from California to Heathrow
Discover carefully curated flight deals from California to Heathrow that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 28, 2025.

Wed 9/107:30 pmLAX - LHR

1 stop14h 10mScandinavian Airlines

Thu 9/1810:20 amLHR - LAX

1 stop14h 00mScandinavian Airlines

Deal found 3/27

$585

Sat 4/2610:45 pmLAX - LHR

1 stop23h 50mAir Canada

Fri 5/99:30 amLHR - LAX

1 stop18h 20mAir Canada

Deal found 3/27

$598

Sun 5/48:15 pmLAX - LHR

1 stop14h 40mAer Lingus

Thu 5/2212:00 pmLHR - LAX

1 stop14h 25mAer Lingus

Deal found 3/26

$604

Tue 7/224:40 pmLAX - LHR

1 stop18h 10mTAP AIR PORTUGAL

Tue 8/196:00 amLHR - LAX

1 stop16h 40mTAP AIR PORTUGAL

Deal found 3/27

$606

Wed 4/161:20 pmLAX - LHR

Nonstop10h 40mIberia

Wed 4/3011:40 amLHR - LAX

Nonstop11h 15mIberia

Deal found 3/26

$607

Wed 4/24:35 pmSFO - LHR

1 stop12h 45mMultiple Airlines

Tue 4/158:45 amLHR - SFO

1 stop15h 25mMultiple Airlines

Deal found 3/27

$609

Wed 4/24:05 pmSFO - LHR

Nonstop10h 20mVirgin Atlantic

Tue 4/156:30 amLHR - SFO

1 stop13h 15mVirgin Atlantic

Deal found 3/27

$625

Sun 4/64:05 pmSFO - LHR

Nonstop10h 20mKLM

Tue 4/2211:15 amLHR - SFO

Nonstop11h 00mKLM

Deal found 3/27

$629

Tue 4/227:30 pmSFO - LHR

Nonstop10h 25mAmerican Airlines

Wed 4/309:50 amLHR - SFO

1 stop13h 55mAmerican Airlines

Deal found 3/27

$642

Mon 4/287:30 pmSFO - LHR

Nonstop10h 25mBritish Airways

Wed 5/72:15 pmLHR - SFO

Nonstop11h 00mBritish Airways

Deal found 3/27

$649

Wed 4/163:55 pmSFO - LHR

Nonstop10h 30mUnited Airlines

Thu 4/241:45 pmLHR - SFO

1 stop34h 25mUnited Airlines

Deal found 3/28

$650

Sun 4/279:25 pmLAX - LHR

Nonstop10h 40mFinnair

Tue 5/1310:20 amLHR - LAX

1 stop14h 45mFinnair

Deal found 3/27

$657

Last-minute flights from California to Heathrow
Discover last-minute flight deals from California to Heathrow. Data last updated March 28, 2025 and is based on user searches.

Mon 3/315:45 pmSFO - LHR

1 stop14h 10mAer Lingus

Wed 4/29:50 amLHR - SFO

1 stop14h 05mAer Lingus

Deal found 3/28

$632

Tue 4/16:35 amSJC - LHR

1 stop17h 45mUnited Airlines

Tue 4/292:05 pmLHR - SJC

2 stops31h 30mUnited Airlines

Deal found 3/26

$660

Wed 4/24:35 pmSFO - LHR

1 stop12h 45mMultiple Airlines

Tue 4/158:45 amLHR - SFO

1 stop15h 25mMultiple Airlines

Deal found 3/27

$609

Wed 4/24:05 pmSFO - LHR

Nonstop10h 20mVirgin Atlantic

Tue 4/156:30 amLHR - SFO

1 stop13h 15mVirgin Atlantic

Deal found 3/27

$625

Wed 4/27:40 pmSFO - LHR

Nonstop10h 30mLufthansa

Tue 4/1512:20 pmLHR - SFO

Nonstop11h 05mLufthansa

Deal found 3/27

$667

Sun 4/65:45 pmSFO - LHR

1 stop17h 10mAer Lingus

Tue 4/227:40 amLHR - SFO

1 stop16h 15mAer Lingus

Deal found 3/27

$621

Sun 4/64:05 pmSFO - LHR

Nonstop10h 20mKLM

Tue 4/2211:15 amLHR - SFO

Nonstop11h 00mKLM

Deal found 3/27

$629

Sun 4/67:30 pmLAX - LHR

1 stop18h 10mScandinavian Airlines

Tue 4/226:40 amLHR - LAX

1 stop17h 40mScandinavian Airlines

Deal found 3/26

$635

Sun 4/64:05 pmSFO - LHR

Nonstop10h 20mDelta

Thu 4/176:30 amLHR - SFO

1 stop13h 15mDelta

Deal found 3/27

$654

Sun 4/67:40 pmSFO - LHR

Nonstop10h 30mUnited Airlines

Fri 4/186:30 amLHR - SFO

1 stop17h 35mUnited Airlines

Deal found 3/27

$655

Sun 4/67:30 pmSFO - LHR

Nonstop10h 25mFinnair

Tue 4/2210:45 amLHR - SFO

Nonstop11h 05mFinnair

Deal found 3/27

$657

Sun 4/64:35 pmSFO - LHR

1 stop12h 45mAir Canada

Tue 4/229:30 amLHR - SFO

2 stops18h 37mAir Canada

Deal found 3/27

$662

One-way flights from California to Heathrow
Search for one-way flight options from California to Heathrow. Find affordable one-way fares based on user searches. Data last updated March 28, 2025.

Mon 4/77:45 pmLAX - LHR

1 stop34h 30mMultiple Airlines

Deal found 3/27

$265

Fri 7/257:58 pmLAS - LHR

2 stops37h 47mMultiple Airlines

Deal found 3/27

$286

Sat 8/24:40 pmLAX - LHR

1 stop22h 15mTAP AIR PORTUGAL

Deal found 3/28

$294

Wed 4/307:00 amLAX - LHR

1 stop21h 05mWestJet

Deal found 3/27

$313

Tue 4/2912:00 pmLAS - LHR

1 stop13h 30mJetBlue

Deal found 3/26

$324

Tue 7/1510:32 amSJC - LHR

2 stops24h 18mMultiple Airlines

Deal found 3/27

$334

Fri 4/111:20 pmSNA - LHR

1 stop14h 45mWestJet

Deal found 3/27

$358

Sun 4/67:30 pmLAX - LHR

1 stop15h 00mScandinavian Airlines

Deal found 3/28

$375

Sun 4/206:45 pmLAX - LHR

1 stop14h 20mFinnair

Deal found 3/27

$376

Mon 5/127:40 pmSFO - LHR

1 stop14h 50mScandinavian Airlines

Deal found 3/27

$388

Mon 4/288:30 amLAX - LHR

1 stop17h 00mJetBlue

Deal found 3/27

$389

Mon 4/143:30 pmSFO - LHR

3 stops46h 15mMultiple Airlines

Deal found 3/27

$391

Cheapflights Fare Finder

Use the filters below to find and compare flights from California to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Los AngelesLondon

LAX - LHR

LAXLHR

Los Angeles

Thu 8/28

7:30 pm-9:40 pm

1 stop18h 10m

London Heathrow

Sun 8/31

10:20 am-4:20 pm

1 stop14h 00m

$584

Las VegasLondon

LAS - LHR

LASLHR

Las Vegas Harry Reid Intl

Fri 5/9

11:20 pm-9:35 am

2 stops26h 15m

London Heathrow

Mon 5/12

7:05 am-12:18 am

2 stops25h 13m

$587

Los AngelesLondon

LAX - LHR

LAXLHR

Los Angeles

Mon 4/14

10:45 pm-6:35 am

1 stop23h 50m

London Heathrow

Fri 4/25

10:15 am-7:08 pm

2 stops16h 53m

$599

Los AngelesLondon

LAX - LHR

LAXLHR

Los Angeles

Tue 7/22

4:40 pm-6:50 pm

1 stop18h 10m

London Heathrow

Tue 8/19

6:00 am-2:40 pm

1 stop16h 40m

$606

San FranciscoLondon

SFO - LHR

SFOLHR

San Francisco

Tue 4/15

7:40 pm-9:40 pm

1 stop18h 00m

London Heathrow

Tue 5/6

9:05 pm-4:30 pm

2 stops27h 25m

$606

Los AngelesLondon

LAX - LHR

LAXLHR

Los Angeles

Sun 4/27

7:45 pm-2:15 pm

1 stop34h 30m

London Heathrow

Fri 5/9

3:05 pm-7:05 pm

1 stop36h 00m

$617

Los AngelesLondon

LAX - LHR

LAXLHR

Los Angeles

Wed 4/16

1:20 pm-10:30 am

1 stop13h 10m

London Heathrow

Wed 4/30

3:30 pm-10:59 pm

1 stop15h 29m

$621

San FranciscoLondon

SFO - LHR

SFOLHR

San Francisco

Tue 4/22

1:00 pm-1:20 pm

1 stop16h 20m

London Heathrow

Tue 4/29

6:00 am-4:10 pm

1 stop18h 10m

$628

Los AngelesLondon

LAX - LHR

LAXLHR

Los Angeles

Mon 4/7

7:35 pm-5:50 pm

1 stop14h 15m

London Heathrow

Fri 4/25

8:40 am-4:30 pm

1 stop15h 50m

$630

San FranciscoLondon

SFO - LHR

SFOLHR

San Francisco

Wed 4/30

5:45 pm-2:55 pm

1 stop13h 10m

London Heathrow

Tue 5/6

7:40 am-3:55 pm

1 stop16h 15m

$633

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

Showing 1-10 of 60 results

...

Best time to book a flight from California to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow 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 London Heathrow Airport

What is the cheapest month to book a flight from California to London Heathrow Airport?

Currently, November is the cheapest month in which you can book a flight from California to London Heathrow Airport (average of $661). Flying from California to London Heathrow Airport in June is currently the most expensive (average of $1,115). 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 LHR?

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

Rainfall in Heathrow by month

In terms of precipitation, rainfall in London Heathrow Airport ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London Heathrow Airport when rainfall is around 1.6 in.

Temperature in Heathrow by month

If weather is an important factor for your trip to London Heathrow Airport, 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 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

Reviews of airlines servicing Heathrow

Peruse reviews from past customers who have flown with Delta, Alaska Airlines and KLM from California to London to help guide your decision. 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.

Delta

8.0

Very good

7,896 reviews

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

7,896 reviews

Delta

8.0

Very good

7,896 reviews

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.

Alaska Airlines

8.0

Very good

9,798 reviews

Delta

8.0

Very good

7,896 reviews

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

1,321 reviews

Delta

8.0

Very good

7,896 reviews

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.

Finnair

7.6

Good

1,267 reviews

Delta

8.0

Very good

7,896 reviews

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.

SWISS

7.5

Good

1,570 reviews

Delta

8.0

Very good

7,896 reviews

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

What are the cheapest airlines to fly from California to London Heathrow Airport one-way?
$294 is the cheapest one-way deal found within the past few days, from TAP AIR PORTUGAL. You may also be able to find cheap deals on WestJet and JetBlue, with prices starting from $313 and $324, respectively.
What are the most popular routes from California to London Heathrow Airport?
When deciding which route to take from California to London Heathrow Airport consider Los Angeles - London Heathrow, San Francisco - London Heathrow or San Diego - London Heathrow as they are the most popular.
What are the most reliable airlines from California to London Heathrow Airport?
The top 3 most reliable airlines when flying from California to London Heathrow Airport are Air France (91%), Delta (91%) and Aeromexico (91%).
What are the cheapest flights from California to London Heathrow Airport?
Looking at all options, your cheapest flight can be booked for $418. While the most popular route (Los Angeles - London Heathrow) can be booked for $504 on average our data indicates $3,229 when flying from California to London Heathrow Airport.
Can I find deals for flights from California to Heathrow that include hotel bookings?
Yes. In addition to deals on California to Heathrow flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from California to Heathrow?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from California to Heathrow.
Can I find deals for business class flights from California to Heathrow?
Yes. Cheapflights offers flight deals from California to Heathrow 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 London Heathrow Airport?
Currently, November is the cheapest month in which you can book a flight from California to London Heathrow Airport (average of $661). Flying from California to London Heathrow Airport in June is currently the most expensive (average of $1,115). 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

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Watford

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Croydon

Borehamwood

Bromley

Folkestone

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Top 10 airlines flying from California to Heathrow

Airline	Cheapest	Average	Flexibility	On-time
WestJet	Cheapest$272	Average$807	FlexibilityNo cancel fee	On-time60%
Scandinavian Airlines	Cheapest$316	Average$589	FlexibilityNo cancel fee	On-time77%
Air France	Cheapest$447	Average$608	FlexibilityNo cancel fee	On-time77%
Virgin Atlantic	Cheapest$454	Average$865	FlexibilityNo cancel fee	On-time72%
KLM	Cheapest$463	Average$834	FlexibilityNo cancel fee	On-time75%
Norse Atlantic UK	Cheapest$464	Average$702	FlexibilityNo cancel fee	On-timeN/A
Finnair	Cheapest$465	Average$723	FlexibilityNo cancel fee	On-time76%
Lufthansa	Cheapest$475	Average$1,062	FlexibilityNo cancel fee	On-time76%
Delta	Cheapest$482	Average$846	FlexibilityNo cancel fee	On-timeN/A
TAP AIR PORTUGAL	Cheapest$491	Average$645	FlexibilityNo cancel fee	On-timeN/A

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$265+ Cheap flights from California to Heathrow (LHR)

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 4/7. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from California to Heathrow with Cheapflights

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Cheap flight deals from California to Heathrow

Keep the following information in mind while searching for California to Heathrow flight deals. Data was last updated March 28, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from California to Heathrow

Cheapest flights from California to HeathrowExplore the most affordable flight options available from California to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 28, 2025.

Explore the most affordable flight options available from California to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 28, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from California to London Heathrow Airport that are best for you.

Best time to book a flight from California to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from California with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from California to London Heathrow Airport

What is the cheapest month to book a flight from California to London Heathrow Airport?

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

Find hourly flight availability from California to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 28, 2025.

Rainfall in Heathrow by month

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

Temperature in Heathrow by month

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

Reviews of airlines servicing Heathrow

Related info for your journey

Find useful and relevant information for your journey from California to Heathrow. 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 London Heathrow Airport one-way?

What are the most popular routes from California to London Heathrow Airport?

What are the most reliable airlines from California to London Heathrow Airport?

What are the cheapest flights from California to London Heathrow Airport?

Can I find deals for flights from California to Heathrow that include hotel bookings?

How can I find direct flights from California to Heathrow?

Can I find deals for business class flights from California to Heathrow?

What is the cheapest month to book a flight from California to London Heathrow Airport?

Traveling to a place near California?

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Alternative routes for California to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.

Top 10 airlines flying from California to Heathrow

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Cheapest flights from California to Heathrow
Explore the most affordable flight options available from California to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 28, 2025.