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Cheap flights from London Heathrow Airport to Los Angeles from $439

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London Heathrow Airport to Los Angeles departing on 3/18. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from London Heathrow Airport to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
British Airways Logo
10:05 am - 4:22 pm
LHR
-
ONT
14h 17m
1 stop
British Airways Logo
10:59 am - 8:05 am
ONT
-
LHR
13h 06m
1 stop
$561British Airways
Mon, Apr 13 - Mon, May 4
United Airlines Logo
2:50 pm - 8:17 pm
LHR
-
ONT
13h 27m
1 stop
United Airlines Logo
1:00 pm - 9:40 am
ONT
-
LHR
12h 40m
1 stop
$562United Airlines
Wed, Jul 8 - Sun, Jul 12
United Airlines Logo
1:40 pm - 9:40 pm
LHR
-
ONT
16h 00m
1 stop
United Airlines Logo
7:00 am - 6:35 am
ONT
-
LHR
15h 35m
2 stops
$570United Airlines
Wed, Jul 8 - Sun, Jul 12
British Airways Logo
10:05 am - 4:22 pm
LHR
-
ONT
14h 17m
1 stop
British Airways Logo
10:59 am - 8:05 am
ONT
-
LHR
13h 06m
1 stop
$582British Airways
Thu, Apr 16 - Thu, Apr 23
Finnair Logo
12:55 pm - 11:46 pm
LHR
-
ONT
18h 51m
1 stop
Finnair Logo
10:59 am - 8:05 am
ONT
-
LHR
13h 06m
1 stop
$584Finnair
Wed, Apr 15 - Thu, Apr 23
British Airways Logo
10:05 am - 4:22 pm
LHR
-
ONT
14h 17m
1 stop
British Airways Logo
10:59 am - 8:05 am
ONT
-
LHR
13h 06m
1 stop
$585British Airways
Mon, Apr 13 - Mon, May 4
British Airways Logo
10:05 am - 4:22 pm
LHR
-
ONT
14h 17m
1 stop
British Airways Logo
10:59 am - 8:05 am
ONT
-
LHR
13h 06m
1 stop
$586British Airways
Wed, Apr 8 - Mon, Apr 13
Iberia Logo
10:50 am - 11:46 pm
LHR
-
ONT
20h 56m
2 stops
Iberia Logo
2:08 pm - 12:10 pm
ONT
-
LHR
14h 02m
1 stop
$591Iberia
Wed, Apr 15 - Thu, Apr 23
British Airways Logo
4:20 pm - 7:52 pm
LHR
-
ONT
35h 32m
2 stops
British Airways Logo
2:22 pm - 12:10 pm
ONT
-
LHR
13h 48m
1 stop
$592British Airways
Sun, Jun 21 - Tue, Jul 7
Delta Logo
6:30 am - 5:15 pm
LHR
-
ONT
18h 45m
2 stops
Delta Logo
1:35 pm - 3:35 pm
ONT
-
LHR
18h 00m
1 stop
$595Delta
Mon, Apr 27 - Sat, May 9

United Airlines flights from London Heathrow Airport to Ontario

Our best United Airlines deals on London Heathrow Airport to Ontario flight tickets
United Airlines
Jul 8
LHR2:50 pmLondon Heathrow
13h 27m
1 stop
ONT8:17 pmOntario
Jul 12
ONT1:00 pmOntario
12h 40m
1 stop
LHR9:40 amLondon Heathrow
$562
United Airlines
Jul 8
LHR1:40 pmLondon Heathrow
16h 00m
1 stop
ONT9:40 pmOntario
Jul 12
ONT7:00 amOntario
15h 35m
2 stops
LHR6:35 amLondon Heathrow
$570
United Airlines
Mar 23
LHR1:45 pmLondon Heathrow
16h 12m
1 stop
ONT10:57 pmOntario
Mar 30
ONT11:05 amOntario
16h 05m
1 stop
LHR11:10 amLondon Heathrow
$609

Iberia flights from London Heathrow Airport to Ontario

Our best Iberia deals on London Heathrow Airport to Ontario flight tickets
Iberia
Apr 15
LHR10:50 amLondon Heathrow
20h 56m
2 stops
ONT11:46 pmOntario
Apr 23
ONT2:08 pmOntario
14h 02m
1 stop
LHR12:10 pmLondon Heathrow
$591
Iberia
Apr 13
LHR4:25 pmLondon Heathrow
15h 21m
1 stop
ONT11:46 pmOntario
Apr 27
ONT10:59 amOntario
13h 06m
1 stop
LHR8:05 amLondon Heathrow
$611
Iberia
Apr 14
LHR12:55 pmLondon Heathrow
17h 41m
1 stop
ONT10:36 pmOntario
May 5
ONT10:59 amOntario
13h 06m
1 stop
LHR8:05 amLondon Heathrow
$636

momondo Fare Finder

 
Customize your flight search to find flights from London Heathrow Airport to Ontario 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, momondo users made 832,500 searches. Data last updated February 6, 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 4/13

10:05 am-4:22 pm

1 stop14h 17m

Ontario

Mon 5/4

10:59 am-8:05 am

1 stop13h 06m

$561

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 7/8

2:50 pm-8:17 pm

1 stop13h 27m

Ontario

Sun 7/12

1:00 pm-9:40 am

1 stop12h 40m

$562

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 7/8

1:40 pm-9:40 pm

1 stop16h 00m

Ontario

Sun 7/12

7:00 am-6:35 am

2 stops15h 35m

$570

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 4/16

10:05 am-4:22 pm

1 stop14h 17m

Ontario

Thu 4/23

10:59 am-8:05 am

1 stop13h 06m

$582

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 4/15

12:55 pm-11:46 pm

1 stop18h 51m

Ontario

Thu 4/23

10:59 am-8:05 am

1 stop13h 06m

$584

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 4/13

10:05 am-4:22 pm

1 stop14h 17m

Ontario

Mon 5/4

10:59 am-8:05 am

1 stop13h 06m

$585

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 4/8

10:05 am-4:22 pm

1 stop14h 17m

Ontario

Mon 4/13

10:59 am-8:05 am

1 stop13h 06m

$586

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 4/15

10:50 am-11:46 pm

2 stops20h 56m

Ontario

Thu 4/23

2:08 pm-12:10 pm

1 stop14h 02m

$591

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 6/21

4:20 pm-7:52 pm

2 stops35h 32m

Ontario

Tue 7/7

2:22 pm-12:10 pm

1 stop13h 48m

$592

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 4/27

6:30 am-5:15 pm

2 stops18h 45m

Ontario

Sat 5/9

1:35 pm-3:35 pm

1 stop18h 00m

$595

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Los Angeles from

How to get the cheapest flight ticket from London Heathrow Airport to Ontario

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Ontario?

In general, February is the cheapest month to fly from London Heathrow Airport to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $526. If you aren’t able to travel during the month of February, then book flights to Ontario from London Heathrow Airport during January instead. Flights to Ontario in January, while not as cheap as those in February, still average around $553.

How far in advance should I book a flight to Ontario?

You are more likely to see cheaper flights to Ontario from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $671 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from London Heathrow Airport for as low as $527 on momondo.

Can stopping save me money on London Heathrow Airport to Ontario flights?

You could potentially save up to 3% on your flight if you consider stops on a London Heathrow Airport to Ontario flight.

When to book flights from London Heathrow Airport to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from London Heathrow Airport to Ontario according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap London Heathrow Airport to Ontario (LHR to ONT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport to Ontario

Fastest flight time

13h 24m

Direct flights

None
The fastest flight from London Heathrow Airport to Ontario takes 13h 24m
There are no direct flights from London Heathrow Airport to Ontario. There are no popular flight routes from London Heathrow Airport to Ontario.
Search flight deals

  • How far is London Heathrow to Ontario by plane?

    London Heathrow and Ontario are 5408.1 mi apart from one another. 13h 24m is a normal flight duration for this route.

  • When did momondo last update prices for flights from London Heathrow Airport to Ontario Airport?

    Prices for flights from London Heathrow Airport to Ontario Airport are updated daily.

  • How many operators does momondo search for flights from London Heathrow Airport to Ontario Airport?

  • How old do you have to be to fly from London Heathrow Airport to Ontario Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London Heathrow Airport to Ontario Airport.

  • What documentation or ID do you need to fly to Ontario Airport?

    The required travel and health documents for your Ontario Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ontario Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular airline from London Heathrow Airport to Ontario?

Best airlines flying from London Heathrow Airport to Ontario

Compare and see reviews for airlines that fly from London Heathrow Airport to Ontario with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $497Free CancellationRating
7.4
9,242 reviews
Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from London to Ontario?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from London to Ontario. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from London to Ontario with flexible booking policies on momondo?

Yes. All flights to Ontario from London on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from London to Ontario?

Once all potential London to Ontario flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from London to Ontario right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Ontario from London. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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