How long is the flight from California to London Heathrow Airport?

For as low as £621, United Airlines can have you in London Heathrow Airport from California in 13h 55m. Airlines will cover a distance of 5439 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

The cheapest airline one-way is Virgin Atlantic, with whom users have recently found tickets for as low as £172. However, be on the lookout for offers from JetBlue and Alaska Airlines, as they are both options that can get you from California to London Heathrow Airport for a low price.

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

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 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

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

Most travelers choose Los Angeles - London Heathrow, San Francisco - London Heathrow or Ontario - London Heathrow when deciding on the best route from California to London Heathrow Airport.

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

Looking for the cheapest flight from California to London Heathrow Airport? While on average our users pay £927, our data indicates the cheapest price to be £242. The most popular route (Los Angeles - London Heathrow), is priced around £408.

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

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from California to London Heathrow Airport on time: KLM (91%), SAUDIA (91%), Air France (91%).

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

Before booking your flight from California to London Heathrow Airport check out the most popular airlines for this route: Virgin Atlantic, British Airways or United Airlines.

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 holiday 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.

£126+ Cheap Flights from California to London Heathrow Airport

Cheap flight deals from California to Heathrow

Enter your travel dates to find the best prices.

Cheapest

Best

Direct

Last-minute

One-way

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 3 November 2026.

Tue 17/1117:10 -

1 stop35h 30m

Thu 26/1106:00 -

1 stop17h 15m

Deal found 3/11£549

Fri 6/1119:15 -

1 stop18h 20m

Mon 9/1106:00 -

1 stop16h 25m

Deal found 1/11£549

Mon 30/1116:35 -

2 stops19h 30m

Tue 15/1218:30 -

1 stop28h 15m

Deal found 2/11£552

Mon 30/1116:35 -

2 stops19h 30m

Sun 6/1220:50 -

2 stops25h 35m

Deal found 1/11£553

Tue 24/1109:20 -

1 stop23h 40m

Mon 7/1217:10 -

1 stop22h 10m

Deal found 3/11£554

Wed 9/1216:35 -

1 stop16h 55m

Tue 15/1208:15 -

1 stop38h 30m

Deal found 29/10£554

Fri 4/1223:32 -

1 stop14h 08m

Wed 9/1209:00 -

1 stop15h 30m

Deal found 30/10£555

Thu 26/1116:45 -

1 stop17h 45m

Fri 11/1219:30 -

1 stop27h 20m

Deal found 2/11£556

Sat 14/1116:35 -

1 stop22h 05m

Sat 21/1106:00 -

1 stop16h 45m

Deal found 2/11£556

Tue 1/1217:10 -

1 stop34h 15m

Tue 8/1206:00 -

1 stop17h 15m

Deal found 1/11£558

Tue 17/1116:45 -

1 stop20h 55m

Wed 25/1106:40 -

1 stop16h 10m

Deal found 30/10£558

Tue 24/1116:45 -

1 stop16h 55m

Wed 9/1206:40 -

1 stop16h 10m

Deal found 3/11£559

Best flights from California to Heathrow
Discover carefully curated flight deals from California to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 3 November 2026.

Sat 16/116:45 -

2 stops20h 50m

Sun 31/106:40 -

1 stop16h 10m

Deal found 2/11£571

Tue 2/308:05 -

2 stops39h 05m

Fri 5/306:35 -

2 stops21h 14m

Deal found 30/10£578

Wed 9/1211:35 -

1 stop13h 55m

Wed 16/1212:20 -

1 stop20h 37m

Deal found 30/10£621

Mon 8/211:36 -

1 stop16h 44m

Fri 26/214:45 -

1 stop15h 54m

Deal found 29/10£664

Sun 21/216:40 -

Nonstop10h 15m

Mon 8/317:35 -

1 stop27h 20m

Deal found 29/10£664

Tue 2/216:19 -

1 stop13h 16m

Tue 16/211:15 -

1 stop15h 18m

Deal found 30/10£685

Fri 16/412:55 -

1 stop13h 05m

Mon 26/420:55 -

2 stops27h 42m

Deal found 3/11£709

Thu 10/1212:50 -

Nonstop10h 35m

Wed 16/1206:00 -

1 stop18h 30m

Deal found 1/11£732

Sun 2/511:03 -

3 stops26h 57m

Sat 15/508:00 -

2 stops34h 35m

Deal found 1/11£895

Mon 1/207:00 -

2 stops19h 50m

Fri 5/212:15 -

2 stops17h 50m

Deal found 1/11£905

Mon 12/416:45 -

2 stops18h 05m

Mon 26/421:05 -

2 stops25h 35m

Deal found 29/10£590

Thu 3/1222:00 -

1 stop14h 55m

Tue 8/1209:20 -

1 stop22h 06m

Deal found 2/11£621

Sat 9/116:45 -

1 stop20h 55m

Tue 26/119:30 -

1 stop27h 20m

Deal found 1/11£591

Sun 14/216:40 -

Nonstop10h 35m

Tue 2/309:00 -

1 stop15h 30m

Deal found 2/11£650

Sun 14/312:00 -

1 stop17h 20m

Thu 25/314:45 -

1 stop14h 54m

Deal found 2/11£667

Tue 30/309:45 -

1 stop16h 15m

Wed 14/406:30 -

2 stops18h 07m

Deal found 31/10£671

Wed 3/321:30 -

1 stop16h 10m

Wed 10/309:20 -

1 stop18h 58m

Deal found 2/11£628

Mon 1/218:00 -

Nonstop10h 40m

Sat 6/212:45 -

Nonstop11h 25m

Deal found 1/11£722

Wed 9/1216:45 -

2 stops20h 50m

Mon 14/1206:40 -

1 stop16h 10m

Deal found 31/10£603

Tue 9/213:18 -

1 stop15h 02m

Wed 17/214:45 -

1 stop15h 25m

Deal found 2/11£667

Wed 28/406:20 -

1 stop20h 50m

Wed 19/508:45 -

2 stops19h 22m

Deal found 1/11£670

Mon 16/1106:04 -

2 stops17h 41m

Mon 23/1120:25 -

2 stops28h 11m

Deal found 31/10£747

Fri 27/1105:55 -

1 stop20h 05m

Fri 4/1206:20 -

2 stops18h 02m

Deal found 30/10£749

Tue 5/121:40 -

1 stop16h 00m

Mon 3/508:40 -

1 stop19h 41m

Deal found 29/10£628

Sat 6/212:34 -

2 stops23h 36m

Wed 17/220:10 -

2 stops23h 50m

Deal found 2/11£691

Wed 17/216:25 -

1 stop13h 10m

Sun 28/211:15 -

1 stop15h 27m

Deal found 29/10£722

Mon 1/213:18 -

1 stop15h 02m

Fri 5/214:45 -

1 stop15h 20m

Deal found 1/11£667

Tue 16/308:20 -

1 stop20h 30m

Thu 25/315:20 -

Nonstop11h 25m

Deal found 2/11£677

Wed 17/306:00 -

1 stop21h 00m

Sun 28/311:45 -

2 stops17h 50m

Deal found 1/11£750

Tue 12/107:00 -

2 stops27h 30m

Tue 19/117:30 -

2 stops29h 20m

Deal found 30/10£622

Find flight deals from California to Heathrow

Round-trip from	£549
One-way from	£126
Popular in	December
Cheapest in	February
Average price	£645
Good round-trip deal	£745 or less
Good one-way deal	£316 or less

TAP AIR PORTUGAL
17/11-26/11
2 total stops
52h 45m total
California to London

Search Deals

WestJet
19/12-31/12
1 total stop
15h 20m total
California to London

Search Deals

Highest demand for flights based on searches. 2% potential increase in price (£13 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 November 2026

Search Deals

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

Search Deals

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

Search Deals

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

Cheapest return flight

San DiegoLondon

SAN San Diego - LHR London Heathrow

SANLHR

San Diego

Mon 7/12

21:40-21:40

1 stop16h 00m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£223

FresnoLondon

FAT Fresno Airterminal - LHR London Heathrow

FATLHR

Fresno Airterminal

Wed 10/3

14:30-12:20

1 stop13h 50m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£252

FresnoLondon

FAT Fresno Airterminal - LHR London Heathrow

FATLHR

Fresno Airterminal

Wed 10/3

05:30-07:55

2 stops18h 25m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£252

FresnoLondon

FAT Fresno Airterminal - LHR London Heathrow

FATLHR

Fresno Airterminal

Wed 10/3

09:45-10:00

1 stop16h 15m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£252

San DiegoLondon

SAN San Diego - LHR London Heathrow

SANLHR

San Diego

Tue 9/2

06:25-08:05

2 stops17h 40m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£253

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Sat 3/4

13:33-07:25

1 stop33h 52m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£254

FresnoLondon

FAT Fresno Airterminal - LHR London Heathrow

FATLHR

Fresno Airterminal

Wed 10/3

08:00-11:20

3 stops19h 20m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£258

San FranciscoLondon

SFO San Francisco - LHR London Heathrow

SFOLHR

San Francisco

Sun 13/12

07:30-06:55

1 stop15h 25m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£275

SacramentoLondon

SMF Sacramento Intl - LHR London Heathrow

SMFLHR

Sacramento Intl

Thu 4/3

14:49-12:15

1 stop13h 26m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£281

San FranciscoLondon

SFO San Francisco - LHR London Heathrow

SFOLHR

San Francisco

Sat 13/2

16:40-10:55

Nonstop10h 15m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£283

Flights are sorted by cheapest return flights first.

Deals found on 2/11

Showing 1-10 of 60 resultsSorted by cheapest first

...

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.

SAN-LHR

FAT-LHR

SMF-LHR

SFO-LHR

PSP-LHR

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 London Heathrow Airport

USCA-LHR

SAN-LHR

FAT-LHR

SMF-LHR

SFO-LHR

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

Currently, February is the cheapest month in which you can book a flight from California to London Heathrow Airport (average of £531). Flying from California to London Heathrow Airport in June is currently the most expensive (average of £1,036). 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?

A simple way to save on the total cost of your ticket is to fly from California to London Heathrow Airport in the morning. If you’re flexible enough to do this you can expect to save up to 26% on your trip compared to booking a flight in the afternoon.

Weekly flight availability from California to London Heathrow Airport

The most flights from USCA to LHR are scheduled on a Monday (51 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (46 on average).

How much does it cost for a return flight from California to London Heathrow Airport?

Airfare is below average for this route at the moment.

California to London Heathrow Airport flights typically cost between £559 and £899 in November.
The cheapest return price found within the last 5 days was £549 on TAP AIR PORTUGAL (17 Nov–26 Nov).

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

The price you pay for your flight from California to London Heathrow Airport may vary depending on when you book. For the best chance of a lower fare, look to book 69 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Travellers seeking maximum savings on their California to London Heathrow Airport flight should consider departing on Monday evenings when fares are most often at their lowest. Friday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Related info for your journey

How long is the flight from California to London Heathrow Airport?
For as low as £621, United Airlines can have you in London Heathrow Airport from California in 13h 55m. Airlines will cover a distance of 5439 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
What are the cheapest airlines to fly from California to London Heathrow Airport one-way?
The cheapest airline one-way is Virgin Atlantic, with whom users have recently found tickets for as low as £172. However, be on the lookout for offers from JetBlue and Alaska Airlines, as they are both options that can get you from California to London Heathrow Airport for a low price.
What are the most popular routes from California to London Heathrow Airport?
Most travelers choose Los Angeles - London Heathrow, San Francisco - London Heathrow or Ontario - London Heathrow when deciding on the best route from California to London Heathrow Airport.
What are the most reliable airlines from California to London Heathrow Airport?
Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from California to London Heathrow Airport on time: KLM (91%), SAUDIA (91%), Air France (91%).
What are the cheapest flights from California to London Heathrow Airport?
Looking for the cheapest flight from California to London Heathrow Airport? While on average our users pay £927, our data indicates the cheapest price to be £242. The most popular route (Los Angeles - London Heathrow), is priced around £408.
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 holiday 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, February is the cheapest month in which you can book a flight from California to London Heathrow Airport (average of £531). Flying from California to London Heathrow Airport in June is currently the most expensive (average of £1,036). 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.

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Top 10 airlines flying from California to Heathrow

Airline	Cheapest	Average	Flexibility	On-time
TAP AIR PORTUGAL	Cheapest£237	Average£479	FlexibilityNo cancel fee	On-timeN/A	Search TAP AIR PORTUGAL flights
Finnair	Cheapest£321	Average£807	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
Virgin Atlantic	Cheapest£451	Average£643	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
KLM	Cheapest£455	Average£805	FlexibilityNo cancel fee	On-time75%	Search KLM flights
British Airways	Cheapest£461	Average£799	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
United Airlines	Cheapest£472	Average£913	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
American Airlines	Cheapest£563	Average£900	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
Air France	Cheapest£581	Average£988	FlexibilityNo cancel fee	On-time77%	Search Air France flights
Delta	Cheapest£586	Average£1,052	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Iberia	Cheapest£643	Average£804	FlexibilityNo cancel fee	On-time77%	Search Iberia flights

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How does Cheapflights help users find flights from California to Heathrow?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Heathrow from California today with Cheapflights!

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

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from California to Heathrow.

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

Yes! Cheapflights helps users easily find flights from California to Heathrow with no change fees.

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

Of course! You can now track prices for flights from California to Heathrow 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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Cheap flights from California to London Heathrow Airport from £126

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 19/12. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap 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 3 November 2026.

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 3 November 2026.

Best flights from California to HeathrowDiscover carefully curated flight deals from California to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 3 November 2026.

Discover carefully curated flight deals from California to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 3 November 2026.

Direct flights from California to HeathrowExplore direct flight options from California to Heathrow based on user searches, and compare prices and availability for your desired travel dates. Data last updated 3 November 2026.

Explore direct flight options from California to Heathrow based on user searches, and compare prices and availability for your desired travel dates. Data last updated 3 November 2026.

Last-minute flights from California to HeathrowDiscover last-minute flight deals from California to Heathrow. Data last updated 3 November 2026 and is based on user searches.

Discover last-minute flight deals from California to Heathrow. Data last updated 3 November 2026 and is based on user searches.

One-way flights from California to HeathrowSearch for one-way flight options from California to Heathrow. Find affordable one-way fares based on user searches. Data last updated 3 November 2026.

Search for one-way flight options from California to Heathrow. Find affordable one-way fares based on user searches. Data last updated 3 November 2026.

Find flight deals from California to Heathrow

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

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

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 3 November 2026.

A simple way to save on the total cost of your ticket is to fly from California to London Heathrow Airport in the morning. If you’re flexible enough to do this you can expect to save up to 26% on your trip compared to booking a flight in the afternoon.

Weekly flight availability from California to London Heathrow Airport

Explore weekly flight availability from California to Heathrow. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 3 November 2026.

The most flights from USCA to LHR are scheduled on a Monday (51 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (46 on average).

How much does it cost for a return flight from California to London Heathrow Airport?

Airfare is below average for this route at the moment.

California to London Heathrow Airport flights typically cost between £559 and £899 in November.The cheapest return price found within the last 5 days was £549 on TAP AIR PORTUGAL (17 Nov–26 Nov).

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

The price you pay for your flight from California to London Heathrow Airport may vary depending on when you book. For the best chance of a lower fare, look to book 69 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Use this chart to determine the cheapest time to fly return from California to Heathrow. Price data was last updated on 18 July 2026.

Travellers seeking maximum savings on their California to London Heathrow Airport flight should consider departing on Monday evenings when fares are most often at their lowest. Friday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Related info for your journey

How long is the flight from California to London Heathrow Airport?

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?

Travelling to a place near London Heathrow Airport?

Browse thousands of different options on Cheapflights for your next trip

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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.

Complete your trip

Complete your trip to Heathrow by adding a car hire and/or hotel booking to your travel itinerary.

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Search flights from California to Heathrow by cabin class

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Other flights to Heathrow

Explore flights to Heathrow departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 3 November 2026.

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Top 10 airlines flying from California to Heathrow

Fly with Cheapflights

How does Cheapflights help users find flights 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 3 November 2026.

Best flights from California to Heathrow
Discover carefully curated flight deals from California to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 3 November 2026.

Direct flights from California to Heathrow
Explore direct flight options from California to Heathrow based on user searches, and compare prices and availability for your desired travel dates. Data last updated 3 November 2026.

Last-minute flights from California to Heathrow
Discover last-minute flight deals from California to Heathrow. Data last updated 3 November 2026 and is based on user searches.

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 3 November 2026.

California to London Heathrow Airport flights typically cost between £559 and £899 in November.
The cheapest return price found within the last 5 days was £549 on TAP AIR PORTUGAL (17 Nov–26 Nov).