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Cheap flights from London Heathrow Airport to Los Angeles from $440

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 3/11. 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.
United Airlines Logo
8:30 am - 10:18 pm
LHR
-
ONT
20h 48m
2 stops
United Airlines Logo
1:40 pm - 7:25 am
ONT
-
LHR
34h 45m
1 stop
$472United Airlines
Fri, Mar 13 - Fri, Mar 20
Virgin Atlantic Logo
12:20 pm - 10:33 pm
LHR
-
ONT
17h 13m
1 stop
Virgin Atlantic Logo
10:25 pm - 7:50 am
ONT
-
LHR
26h 25m
1 stop
$489Virgin Atlantic
Fri, Mar 13 - Fri, Mar 20
United Airlines Logo
8:30 am - 10:18 pm
LHR
-
ONT
20h 48m
2 stops
United Airlines Logo
11:59 pm - 6:40 am
ONT
-
LHR
23h 41m
2 stops
$491United Airlines
Fri, Mar 13 - Fri, Mar 20
Virgin Atlantic Logo
2:30 pm - 10:37 pm
LHR
-
ONT
16h 07m
1 stop
Virgin Atlantic Logo
7:30 am - 11:55 am
ONT
-
LHR
20h 25m
1 stop
$497Virgin Atlantic
Thu, Feb 26 - Thu, Mar 5
United Airlines Logo
10:05 am - 5:41 pm
LHR
-
ONT
15h 36m
1 stop
United Airlines Logo
1:40 pm - 12:00 pm
ONT
-
LHR
14h 20m
1 stop
$504United Airlines
Thu, Feb 26 - Thu, Mar 5
United Airlines Logo
11:35 am - 8:57 pm
LHR
-
ONT
16h 22m
1 stop
United Airlines Logo
1:34 pm - 12:20 pm
ONT
-
LHR
14h 46m
1 stop
$505United Airlines
Sun, Mar 15 - Mon, Mar 30
Delta Logo
6:30 am - 10:34 pm
LHR
-
ONT
23h 04m
2 stops
Delta Logo
11:59 am - 3:35 pm
ONT
-
LHR
19h 36m
1 stop
$509Delta
Thu, Mar 19 - Wed, Apr 1
United Airlines Logo
9:30 am - 8:50 pm
LHR
-
ONT
19h 20m
2 stops
United Airlines Logo
5:15 am - 8:25 am
ONT
-
LHR
19h 10m
2 stops
$510United Airlines
Thu, Feb 26 - Thu, Mar 5
United Airlines Logo
1:45 pm - 10:57 pm
LHR
-
ONT
16h 12m
1 stop
United Airlines Logo
1:40 pm - 12:00 pm
ONT
-
LHR
15h 20m
1 stop
$512United Airlines
Fri, Mar 20 - Tue, Mar 24
Virgin Atlantic Logo
11:40 am - 10:37 pm
LHR
-
ONT
18h 57m
1 stop
Virgin Atlantic Logo
9:55 am - 10:00 am
ONT
-
LHR
16h 05m
1 stop
$514Virgin Atlantic
Sat, Apr 25 - Wed, May 27

United Airlines flights from London Heathrow Airport to Ontario

Our best United Airlines deals on London Heathrow Airport to Ontario flight tickets
United Airlines
Mar 13
LHR8:30 amLondon Heathrow
20h 48m
2 stops
ONT10:18 pmOntario
Mar 20
ONT1:40 pmOntario
34h 45m
1 stop
LHR7:25 amLondon Heathrow
$472
United Airlines
Mar 13
LHR8:30 amLondon Heathrow
20h 48m
2 stops
ONT10:18 pmOntario
Mar 20
ONT11:59 pmOntario
23h 41m
2 stops
LHR6:40 amLondon Heathrow
$491
United Airlines
Feb 26
LHR10:05 amLondon Heathrow
15h 36m
1 stop
ONT5:41 pmOntario
Mar 5
ONT1:40 pmOntario
14h 20m
1 stop
LHR12:00 pmLondon Heathrow
$504

Virgin Atlantic flights from London Heathrow Airport to Ontario

Our best Virgin Atlantic deals on London Heathrow Airport to Ontario flight tickets
Virgin Atlantic
Mar 13
LHR12:20 pmLondon Heathrow
17h 13m
1 stop
ONT10:33 pmOntario
Mar 20
ONT10:25 pmOntario
26h 25m
1 stop
LHR7:50 amLondon Heathrow
$489
Virgin Atlantic
Feb 26
LHR2:30 pmLondon Heathrow
16h 07m
1 stop
ONT10:37 pmOntario
Mar 5
ONT7:30 amOntario
20h 25m
1 stop
LHR11:55 amLondon Heathrow
$497
Virgin Atlantic
Apr 25
LHR11:40 amLondon Heathrow
18h 57m
1 stop
ONT10:37 pmOntario
May 27
ONT9:55 amOntario
16h 05m
1 stop
LHR10:00 amLondon Heathrow
$514

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 January 29, 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

Fri 3/13

8:30 am-10:18 pm

2 stops20h 48m

Ontario

Fri 3/20

1:40 pm-7:25 am

1 stop34h 45m

$472

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 3/13

12:20 pm-10:33 pm

1 stop17h 13m

Ontario

Fri 3/20

10:25 pm-7:50 am

1 stop26h 25m

$489

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 3/13

8:30 am-10:18 pm

2 stops20h 48m

Ontario

Fri 3/20

11:59 pm-6:40 am

2 stops23h 41m

$491

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 2/26

2:30 pm-10:37 pm

1 stop16h 07m

Ontario

Thu 3/5

7:30 am-11:55 am

1 stop20h 25m

$497

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 2/26

10:05 am-5:41 pm

1 stop15h 36m

Ontario

Thu 3/5

1:40 pm-12:00 pm

1 stop14h 20m

$504

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 3/15

11:35 am-8:57 pm

1 stop16h 22m

Ontario

Mon 3/30

1:34 pm-12:20 pm

1 stop14h 46m

$505

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 3/19

6:30 am-10:34 pm

2 stops23h 04m

Ontario

Wed 4/1

11:59 am-3:35 pm

1 stop19h 36m

$509

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 2/26

9:30 am-8:50 pm

2 stops19h 20m

Ontario

Thu 3/5

5:15 am-8:25 am

2 stops19h 10m

$510

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 3/20

1:45 pm-10:57 pm

1 stop16h 12m

Ontario

Tue 3/24

1:40 pm-12:00 pm

1 stop15h 20m

$512

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 4/25

11:40 am-10:37 pm

1 stop18h 57m

Ontario

Wed 5/27

9:55 am-10:00 am

1 stop16h 05m

$514

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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, January 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 $553. If you aren’t able to travel during the month of January, then book flights to Ontario from London Heathrow Airport during September instead. Flights to Ontario in September, while not as cheap as those in January, still average around $572.

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 $681 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 46m

Direct flights

None
The fastest flight from London Heathrow Airport to Ontario takes 13h 46m
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 46m 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
9,215 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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