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Cheap flights from London Heathrow Airport to Los Angeles from $336

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 10/31. 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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Find the cheapest flights from London Heathrow Airport to Los Angeles

Cheap round-trip flights

Virgin Atlantic Logo
8:25 pm - 10:41 pmLHR-ONT
33h 16m2 stops
Virgin Atlantic Logo
7:05 am - 9:00 amONT-LHR
17h 55m1 stop
$493Virgin Atlantic
Find Deal
Wed, Oct 29 - Wed, Nov 5
Virgin Atlantic Logo
12:20 pm - 10:41 pmLHR-ONT
17h 21m1 stop
Virgin Atlantic Logo
7:05 am - 7:50 amONT-LHR
16h 45m1 stop
$511Virgin Atlantic
Find Deal
Wed, Oct 29 - Wed, Nov 5
Virgin Atlantic Logo
2:45 pm - 10:41 pmLHR-ONT
14h 56m1 stop
Virgin Atlantic Logo
7:35 am - 12:50 pmONT-LHR
21h 15m1 stop
$512Virgin Atlantic
Find Deal
Thu, Oct 30 - Thu, Nov 6
British Airways Logo
3:00 pm - 10:02 pmLHR-ONT
15h 02m1 stop
British Airways Logo
5:03 pm - 1:15 pmONT-LHR
12h 12m1 stop
$514British Airways
Find Deal
Sat, Feb 7 - Sat, Feb 21
Virgin Atlantic Logo
6:20 am - 9:35 pmLHR-ONT
23h 15m2 stops
Virgin Atlantic Logo
1:20 pm - 10:00 amONT-LHR
12h 40m1 stop
$517Virgin Atlantic
Find Deal
Sat, Nov 15 - Sat, Dec 13
British Airways Logo
10:05 am - 10:18 pmLHR-ONT
19h 13m1 stop
British Airways Logo
2:59 pm - 11:40 amONT-LHR
12h 41m1 stop
$532British Airways
Find Deal
Thu, Oct 30 - Thu, Nov 6
American Airlines Logo
9:35 am - 9:57 pmLHR-ONT
20h 22m2 stops
American Airlines Logo
3:05 pm - 12:15 pmONT-LHR
13h 10m1 stop
$534American Airlines
Find Deal
Thu, Feb 26 - Mon, Mar 2
Delta Logo
6:30 am - 7:19 pmLHR-ONT
19h 49m2 stops
Delta Logo
6:00 am - 8:45 amONT-LHR
18h 45m2 stops
$538Delta
Find Deal
Thu, Oct 30 - Thu, Nov 6
Delta Logo
6:30 am - 5:09 pmLHR-ONT
18h 39m2 stops
Delta Logo
6:00 am - 10:30 amONT-LHR
20h 30m2 stops
$553Delta
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Sat, Nov 22 - Sat, Nov 29
American Airlines Logo
12:00 pm - 6:54 pmLHR-ONT
14h 54m1 stop
American Airlines Logo
4:45 pm - 12:50 pmONT-LHR
12h 05m1 stop
$557American Airlines
Find Deal
Wed, Oct 1 - Sun, Oct 5

American Airlines flights from London Heathrow Airport to Ontario

Our best American Airlines deals on London Heathrow Airport to Ontario flight tickets
American Airlines
Feb 26
LHR9:35 amLondon Heathrow
20h 22m
2 stops
ONT9:57 pmOntario
Mar 2
ONT3:05 pmOntario
13h 10m
1 stop
LHR12:15 pmLondon Heathrow
$534
Find similar
American Airlines
Oct 1
LHR12:00 pmLondon Heathrow
14h 54m
1 stop
ONT6:54 pmOntario
Oct 5
ONT4:45 pmOntario
12h 05m
1 stop
LHR12:50 pmLondon Heathrow
$557
Find similar
American Airlines
Oct 20
LHR3:40 pmLondon Heathrow
14h 09m
1 stop
ONT9:49 pmOntario
Nov 4
ONT4:47 pmOntario
12h 28m
1 stop
LHR1:15 pmLondon Heathrow
$590
Find similar

Virgin Atlantic flights from London Heathrow Airport to Ontario

Our best Virgin Atlantic deals on London Heathrow Airport to Ontario flight tickets
Virgin Atlantic
Oct 29
LHR8:25 pmLondon Heathrow
33h 16m
2 stops
ONT10:41 pmOntario
Nov 5
ONT7:05 amOntario
17h 55m
1 stop
LHR9:00 amLondon Heathrow
$493
Find similar
Virgin Atlantic
Oct 29
LHR12:20 pmLondon Heathrow
17h 21m
1 stop
ONT10:41 pmOntario
Nov 5
ONT7:05 amOntario
16h 45m
1 stop
LHR7:50 amLondon Heathrow
$511
Find similar
Virgin Atlantic
Oct 30
LHR2:45 pmLondon Heathrow
14h 56m
1 stop
ONT10:41 pmOntario
Nov 6
ONT7:35 amOntario
21h 15m
1 stop
LHR12:50 pmLondon Heathrow
$512
Find similar

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 September 16, 2025.
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

Wed 10/29

8:25 pm-10:41 pm

2 stops33h 16m

Ontario

Wed 11/5

7:05 am-9:00 am

1 stop17h 55m

$493

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 10/29

12:20 pm-10:41 pm

1 stop17h 21m

Ontario

Wed 11/5

7:05 am-7:50 am

1 stop16h 45m

$511

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 10/30

2:45 pm-10:41 pm

1 stop14h 56m

Ontario

Thu 11/6

7:35 am-12:50 pm

1 stop21h 15m

$512

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 2/7

3:00 pm-10:02 pm

1 stop15h 02m

Ontario

Sat 2/21

5:03 pm-1:15 pm

1 stop12h 12m

$514

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 11/15

6:20 am-9:35 pm

2 stops23h 15m

Ontario

Sat 12/13

1:20 pm-10:00 am

1 stop12h 40m

$517

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 10/30

10:05 am-10:18 pm

1 stop19h 13m

Ontario

Thu 11/6

2:59 pm-11:40 am

1 stop12h 41m

$532

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 2/26

9:35 am-9:57 pm

2 stops20h 22m

Ontario

Mon 3/2

3:05 pm-12:15 pm

1 stop13h 10m

$534

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 10/30

6:30 am-7:19 pm

2 stops19h 49m

Ontario

Thu 11/6

6:00 am-8:45 am

2 stops18h 45m

$538

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 11/22

6:30 am-5:09 pm

2 stops18h 39m

Ontario

Sat 11/29

6:00 am-10:30 am

2 stops20h 30m

$553

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 10/1

12:00 pm-6:54 pm

1 stop14h 54m

Ontario

Sun 10/5

4:45 pm-12:50 pm

1 stop12h 05m

$557

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 typical price of a round-trip flight between London Heathrow Airport and Ontario?

What is the cheapest month to fly to Ontario?

In general, September 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 $573. If you aren’t able to travel during the month of September, then book flights to Ontario from London Heathrow Airport during February instead. Flights to Ontario in February, while not as cheap as those in September, still average around $589.

What is the cheapest day to depart on your flight to Ontario?

The cheapest day to depart on your flight to Ontario is on a Tuesday when prices can be found for as low as $602. This is often the case because there is less demand to fly during this day of the week. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from London Heathrow Airport to Ontario for around $991.

What is the cheapest time of day to depart on your flight to Ontario?

In the afternoon is the cheapest time of day to fly from London Heathrow Airport to Ontario when you can find flight prices for as low as $602. Flying to Ontario in the afternoon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $814 on average. Flights to Ontario from London Heathrow Airport at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

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 $717 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 $583 on momondo.

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

Direct flights

None
There are no direct flights from London Heathrow Airport to Ontario. There are no popular flight routes from London Heathrow Airport to Ontario.
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  • How far is London Heathrow to Ontario by plane?

    London Heathrow and Ontario are 5408.1 mi apart from one another. 14h 09m 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 $560Free CancellationRating
7.4
8,924 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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