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Cheap flights from London Heathrow Airport to Los Angeles from $467

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 9/15. 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.
United Airlines Logo
9:00 am - 10:45 pm
LHR
-
ONT
21h 45m
2 stops
United Airlines Logo
6:00 am - 9:40 am
ONT
-
LHR
19h 40m
2 stops
$606United Airlines
Sun, Apr 19 - Sun, Apr 26
United Airlines Logo
10:50 am - 10:45 pm
LHR
-
ONT
19h 55m
2 stops
United Airlines Logo
6:00 am - 8:20 am
ONT
-
LHR
18h 20m
2 stops
$608United Airlines
Sat, Apr 18 - Sat, Apr 25
British Airways Logo
10:05 am - 4:22 pm
LHR
-
ONT
14h 17m
1 stop
British Airways Logo
10:59 am - 7:55 am
ONT
-
LHR
12h 56m
1 stop
$611British Airways
Wed, Apr 22 - Wed, Apr 29
British Airways Logo
2:25 pm - 9:08 pm
LHR
-
ONT
14h 43m
1 stop
British Airways Logo
1:31 pm - 10:30 am
ONT
-
LHR
12h 59m
1 stop
$619British Airways
Thu, Sep 10 - Tue, Sep 29
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
$620British Airways
Fri, Apr 17 - Tue, Apr 21
British Airways Logo
10:05 am - 4:22 pm
LHR
-
ONT
14h 17m
1 stop
British Airways Logo
10:59 am - 7:55 am
ONT
-
LHR
12h 56m
1 stop
$621British Airways
Sun, Apr 19 - Wed, Apr 29
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
$622British Airways
Thu, Apr 16 - Thu, Apr 23
British Airways Logo
9:15 am - 11:46 pm
LHR
-
ONT
22h 31m
2 stops
British Airways Logo
11:59 pm - 2:25 pm
ONT
-
LHR
30h 26m
1 stop
$626British Airways
Mon, Apr 27 - Sat, May 9
British Airways Logo
10:05 am - 4:22 pm
LHR
-
ONT
14h 17m
1 stop
British Airways Logo
10:59 am - 7:55 am
ONT
-
LHR
12h 56m
1 stop
$627British Airways
Wed, Apr 8 - Wed, Apr 29
British Airways Logo
10:05 am - 4:22 pm
LHR
-
ONT
14h 17m
1 stop
British Airways Logo
10:59 am - 7:55 am
ONT
-
LHR
12h 56m
1 stop
$629British Airways
Sat, Apr 18 - Wed, Apr 29

British Airways flights from London Heathrow Airport to Ontario

Our best British Airways deals on London Heathrow Airport to Ontario flight tickets
British Airways
Apr 22
LHR10:05 amLondon Heathrow
14h 17m
1 stop
ONT4:22 pmOntario
Apr 29
ONT10:59 amOntario
12h 56m
1 stop
LHR7:55 amLondon Heathrow
$611
British Airways
Sep 10
LHR2:25 pmLondon Heathrow
14h 43m
1 stop
ONT9:08 pmOntario
Sep 29
ONT1:31 pmOntario
12h 59m
1 stop
LHR10:30 amLondon Heathrow
$619
British Airways
Apr 17
LHR10:05 amLondon Heathrow
14h 17m
1 stop
ONT4:22 pmOntario
Apr 21
ONT10:59 amOntario
13h 06m
1 stop
LHR8:05 amLondon Heathrow
$620

United Airlines flights from London Heathrow Airport to Ontario

Our best United Airlines deals on London Heathrow Airport to Ontario flight tickets
United Airlines
Apr 19
LHR9:00 amLondon Heathrow
21h 45m
2 stops
ONT10:45 pmOntario
Apr 26
ONT6:00 amOntario
19h 40m
2 stops
LHR9:40 amLondon Heathrow
$606
United Airlines
Apr 18
LHR10:50 amLondon Heathrow
19h 55m
2 stops
ONT10:45 pmOntario
Apr 25
ONT6:00 amOntario
18h 20m
2 stops
LHR8:20 amLondon Heathrow
$608
United Airlines
Apr 13
LHR11:25 amLondon Heathrow
17h 11m
1 stop
ONT8:36 pmOntario
Apr 26
ONT1:34 pmOntario
15h 01m
1 stop
LHR12:35 pmLondon Heathrow
$637

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 March 24, 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

Cheapest round-trip

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 4/19

9:00 am-10:45 pm

2 stops21h 45m

Ontario

Sun 4/26

6:00 am-9:40 am

2 stops19h 40m

$606

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 4/18

10:50 am-10:45 pm

2 stops19h 55m

Ontario

Sat 4/25

6:00 am-8:20 am

2 stops18h 20m

$608
Quickest round-trip

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 4/22

10:05 am-4:22 pm

1 stop14h 17m

Ontario

Wed 4/29

10:59 am-7:55 am

1 stop12h 56m

$611

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 9/10

2:25 pm-9:08 pm

1 stop14h 43m

Ontario

Tue 9/29

1:31 pm-10:30 am

1 stop12h 59m

$619

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 4/17

10:05 am-4:22 pm

1 stop14h 17m

Ontario

Tue 4/21

10:59 am-8:05 am

1 stop13h 06m

$620

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 4/19

10:05 am-4:22 pm

1 stop14h 17m

Ontario

Wed 4/29

10:59 am-7:55 am

1 stop12h 56m

$621

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

$622

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 4/27

9:15 am-11:46 pm

2 stops22h 31m

Ontario

Sat 5/9

11:59 pm-2:25 pm

1 stop30h 26m

$626

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 4/8

10:05 am-4:22 pm

1 stop14h 17m

Ontario

Wed 4/29

10:59 am-7:55 am

1 stop12h 56m

$627

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 4/18

10:05 am-4:22 pm

1 stop14h 17m

Ontario

Wed 4/29

10:59 am-7:55 am

1 stop12h 56m

$629

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, 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 $678 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 $496 on momondo.

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

You could potentially save up to 18% 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 19m

Direct flights

None
The fastest flight from London Heathrow Airport to Ontario takes 13h 19m
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 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 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.

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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