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Cheap flights from London Heathrow Airport to Los Angeles from $413

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 1/21. 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.
Virgin Atlantic Logo
12:20 pm - 10:38 pmLHR-ONT
17h 18m1 stop
Virgin Atlantic Logo
6:45 am - 2:15 pmONT-LHR
23h 30m1 stop
$504Virgin Atlantic
Find Deal
Sat, Mar 28 - Sat, Apr 11
Delta Logo
6:30 am - 9:07 pmLHR-ONT
22h 37m2 stops
Delta Logo
10:20 pm - 7:50 amONT-LHR
25h 30m1 stop
$515Delta
Find Deal
Thu, Feb 26 - Mon, Mar 2
Virgin Atlantic Logo
6:30 am - 10:40 pmLHR-ONT
24h 10m2 stops
Virgin Atlantic Logo
1:10 pm - 7:05 amONT-LHR
33h 55m2 stops
$522Virgin Atlantic
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Thu, Feb 26 - Mon, Mar 2
Virgin Atlantic Logo
10:45 am - 11:53 pmLHR-ONT
21h 08m1 stop
Virgin Atlantic Logo
6:00 am - 10:00 amONT-LHR
20h 00m1 stop
$532Virgin Atlantic
Find Deal
Thu, Feb 26 - Mon, Mar 2
KLM Logo
10:45 am - 4:04 pmLHR-ONT
13h 19m1 stop
KLM Logo
1:00 pm - 9:50 amONT-LHR
12h 50m1 stop
$542KLM
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Tue, Mar 3 - Mon, Mar 30
KLM Logo
10:55 am - 4:19 pmLHR-ONT
13h 24m1 stop
KLM Logo
1:00 pm - 9:50 amONT-LHR
12h 50m1 stop
$556KLM
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Thu, Apr 2 - Mon, Apr 6
Air France Logo
10:45 am - 4:13 pmLHR-ONT
13h 28m1 stop
Air France Logo
1:04 pm - 9:00 amONT-LHR
35h 56m1 stop
$588Air France
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Thu, Jan 8 - Sun, Jan 11
British Airways Logo
6:15 am - 10:48 pmLHR-ONT
24h 33m2 stops
British Airways Logo
3:09 pm - 12:15 pmONT-LHR
13h 06m1 stop
$638British Airways
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Wed, Jan 21 - Fri, Jan 30
British Airways Logo
8:20 am - 6:17 pmLHR-ONT
17h 57m1 stop
British Airways Logo
4:45 pm - 1:15 pmONT-LHR
12h 30m1 stop
$639British Airways
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Sat, Dec 27 - Thu, Jan 8
United Airlines Logo
11:35 am - 8:42 pmLHR-ONT
17h 07m1 stop
United Airlines Logo
1:34 pm - 9:40 amONT-LHR
12h 06m1 stop
$645United Airlines
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Wed, Dec 10 - Mon, Dec 15

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 28
LHR12:20 pmLondon Heathrow
17h 18m
1 stop
ONT10:38 pmOntario
Apr 11
ONT6:45 amOntario
23h 30m
1 stop
LHR2:15 pmLondon Heathrow
$504
Find similar
Virgin Atlantic
Feb 26
LHR6:30 amLondon Heathrow
24h 10m
2 stops
ONT10:40 pmOntario
Mar 2
ONT1:10 pmOntario
33h 55m
2 stops
LHR7:05 amLondon Heathrow
$522
Find similar
Virgin Atlantic
Feb 26
LHR10:45 amLondon Heathrow
21h 08m
1 stop
ONT11:53 pmOntario
Mar 2
ONT6:00 amOntario
20h 00m
1 stop
LHR10:00 amLondon Heathrow
$532
Find similar

Delta flights from London Heathrow Airport to Ontario

Our best Delta deals on London Heathrow Airport to Ontario flight tickets
Delta
Feb 26
LHR6:30 amLondon Heathrow
22h 37m
2 stops
ONT9:07 pmOntario
Mar 2
ONT10:20 pmOntario
25h 30m
1 stop
LHR7:50 amLondon Heathrow
$515
Find similar
Delta
Feb 18
LHR8:55 amLondon Heathrow
20h 12m
1 stop
ONT9:07 pmOntario
Feb 28
ONT1:09 pmOntario
14h 31m
1 stop
LHR11:40 amLondon Heathrow
$540
Find similar
Delta
Mar 26
LHR6:30 amLondon Heathrow
23h 08m
2 stops
ONT10:38 pmOntario
Apr 9
ONT11:55 amOntario
17h 15m
2 stops
LHR1:10 pmLondon Heathrow
$550
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 November 6, 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

Sat 3/28

12:20 pm-10:38 pm

1 stop17h 18m

Ontario

Sat 4/11

6:45 am-2:15 pm

1 stop23h 30m

$504

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 2/26

6:30 am-9:07 pm

2 stops22h 37m

Ontario

Mon 3/2

10:20 pm-7:50 am

1 stop25h 30m

$515

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 2/26

6:30 am-10:40 pm

2 stops24h 10m

Ontario

Mon 3/2

1:10 pm-7:05 am

2 stops33h 55m

$522

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 2/26

10:45 am-11:53 pm

1 stop21h 08m

Ontario

Mon 3/2

6:00 am-10:00 am

1 stop20h 00m

$532

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 3/3

10:45 am-4:04 pm

1 stop13h 19m

Ontario

Mon 3/30

1:00 pm-9:50 am

1 stop12h 50m

$542

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 4/2

10:55 am-4:19 pm

1 stop13h 24m

Ontario

Mon 4/6

1:00 pm-9:50 am

1 stop12h 50m

$556

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 1/8

10:45 am-4:13 pm

1 stop13h 28m

Ontario

Sun 1/11

1:04 pm-9:00 am

1 stop35h 56m

$588

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 1/21

6:15 am-10:48 pm

2 stops24h 33m

Ontario

Fri 1/30

3:09 pm-12:15 pm

1 stop13h 06m

$638

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 12/27

8:20 am-6:17 pm

1 stop17h 57m

Ontario

Thu 1/8

4:45 pm-1:15 pm

1 stop12h 30m

$639

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 12/10

11:35 am-8:42 pm

1 stop17h 07m

Ontario

Mon 12/15

1:34 pm-9:40 am

1 stop12h 06m

$645

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 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 $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 $719 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.

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

You could potentially save up to 60% 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

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 19m 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
9,007 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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