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Cheap flights from London Heathrow Airport to Los Angeles from $422

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 2/4. 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

Enter your travel dates to find the best prices.
Delta Logo
6:20 am - 5:08 pmLHR-ONT
18h 48m2 stops
Delta Logo
1:15 pm - 10:00 amONT-LHR
12h 45m1 stop
$546Delta
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Tue, Dec 23 - Mon, Dec 29
Delta Logo
10:45 am - 11:54 pmLHR-ONT
21h 09m1 stop
Delta Logo
6:38 am - 10:30 amONT-LHR
19h 52m1 stop
$558Delta
Find Deal
Tue, Dec 23 - Mon, Dec 29
Virgin Atlantic Logo
10:45 am - 11:52 pmLHR-ONT
21h 07m1 stop
Virgin Atlantic Logo
6:45 am - 12:50 pmONT-LHR
22h 05m1 stop
$564Virgin Atlantic
Find Deal
Thu, Feb 26 - Mon, Mar 2
Virgin Atlantic Logo
10:00 am - 10:38 pmLHR-ONT
44h 38m2 stops
Virgin Atlantic Logo
1:00 pm - 7:05 amONT-LHR
34h 05m2 stops
$571Virgin Atlantic
Find Deal
Thu, Feb 26 - Mon, Mar 2
KLM Logo
10:55 am - 4:19 pmLHR-ONT
13h 24m1 stop
KLM Logo
1:00 pm - 9:50 amONT-LHR
12h 50m1 stop
$604KLM
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Tue, Apr 7 - Tue, Apr 21
United Airlines Logo
1:30 pm - 10:51 pmLHR-ONT
17h 21m2 stops
United Airlines Logo
1:40 pm - 12:00 pmONT-LHR
14h 20m1 stop
$627United Airlines
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Wed, Nov 19 - Wed, Nov 26
KLM Logo
10:45 am - 9:14 pmLHR-ONT
18h 29m1 stop
KLM Logo
1:00 pm - 9:00 amONT-LHR
36h 00m1 stop
$641KLM
Find Deal
Fri, Jan 16 - Tue, Jan 20
Multiple Airlines Logo
2:30 pm - 10:51 pmLHR-ONT
16h 21m2 stops
Multiple Airlines Logo
7:00 am - 6:30 amONT-LHR
15h 30m2 stops
$665Multiple Airlines
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Wed, Nov 5 - Wed, Nov 12
Multiple Airlines Logo
2:30 pm - 10:51 pmLHR-ONT
16h 21m2 stops
Multiple Airlines Logo
7:00 am - 6:30 amONT-LHR
15h 30m2 stops
$666Multiple Airlines
Find Deal
Wed, Nov 5 - Wed, Nov 12
United Airlines Logo
8:30 am - 12:17 pmLHR-ONT
35h 47m2 stops
United Airlines Logo
6:41 pm - 7:25 amONT-LHR
28h 44m1 stop
$680United Airlines
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Sun, Dec 7 - Sun, Dec 14

KLM flights from London Heathrow Airport to Ontario

Our best KLM deals on London Heathrow Airport to Ontario flight tickets
KLM
Apr 7
LHR10:55 amLondon Heathrow
13h 24m
1 stop
ONT4:19 pmOntario
Apr 21
ONT1:00 pmOntario
12h 50m
1 stop
LHR9:50 amLondon Heathrow
$604
Find similar
KLM
Jan 16
LHR10:45 amLondon Heathrow
18h 29m
1 stop
ONT9:14 pmOntario
Jan 20
ONT1:00 pmOntario
36h 00m
1 stop
LHR9:00 amLondon Heathrow
$641
Find similar
KLM
Nov 14
LHR6:30 amLondon Heathrow
18h 39m
2 stops
ONT5:09 pmOntario
Dec 4
ONT12:12 pmOntario
15h 28m
1 stop
LHR11:40 amLondon Heathrow
$650
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
Feb 26
LHR10:45 amLondon Heathrow
21h 07m
1 stop
ONT11:52 pmOntario
Mar 2
ONT6:45 amOntario
22h 05m
1 stop
LHR12:50 pmLondon Heathrow
$564
Find similar
Virgin Atlantic
Feb 26
LHR10:00 amLondon Heathrow
44h 38m
2 stops
ONT10:38 pmOntario
Mar 2
ONT1:00 pmOntario
34h 05m
2 stops
LHR7:05 amLondon Heathrow
$571
Find similar
Virgin Atlantic
Oct 30
LHR10:45 amLondon Heathrow
17h 35m
1 stop
ONT9:20 pmOntario
Dec 31
ONT1:15 pmOntario
12h 45m
1 stop
LHR10:00 amLondon Heathrow
$628
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 October 23, 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

Tue 12/23

6:20 am-5:08 pm

2 stops18h 48m

Ontario

Mon 12/29

1:15 pm-10:00 am

1 stop12h 45m

$546

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 12/23

10:45 am-11:54 pm

1 stop21h 09m

Ontario

Mon 12/29

6:38 am-10:30 am

1 stop19h 52m

$558

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 2/26

10:45 am-11:52 pm

1 stop21h 07m

Ontario

Mon 3/2

6:45 am-12:50 pm

1 stop22h 05m

$564

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 2/26

10:00 am-10:38 pm

2 stops44h 38m

Ontario

Mon 3/2

1:00 pm-7:05 am

2 stops34h 05m

$571

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 4/7

10:55 am-4:19 pm

1 stop13h 24m

Ontario

Tue 4/21

1:00 pm-9:50 am

1 stop12h 50m

$604

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 11/19

1:30 pm-10:51 pm

2 stops17h 21m

Ontario

Wed 11/26

1:40 pm-12:00 pm

1 stop14h 20m

$627

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 1/16

10:45 am-9:14 pm

1 stop18h 29m

Ontario

Tue 1/20

1:00 pm-9:00 am

1 stop36h 00m

$641

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 11/5

2:30 pm-10:51 pm

2 stops16h 21m

Ontario

Wed 11/12

7:00 am-6:30 am

2 stops15h 30m

$665

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 11/5

2:30 pm-10:51 pm

2 stops16h 21m

Ontario

Wed 11/12

7:00 am-6:30 am

2 stops15h 30m

$666

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 12/7

8:30 am-12:17 pm

2 stops35h 47m

Ontario

Sun 12/14

6:41 pm-7:25 am

1 stop28h 44m

$680

Flights are sorted by cheapest round-trip flights 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, 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 $595.

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 $718 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 $543 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. 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 $560Free CancellationRating
7.4
8,995 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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